Control commit

app/build.gradle

@@ -48,4 +48,5 @@ dependencies {
     testImplementation libs.junit
     androidTestImplementation libs.ext.junit
     androidTestImplementation libs.espresso.core
+    testImplementation libs.robolectric
 }

app/src/main/AndroidManifest.xml

@@ -7,7 +7,8 @@
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-permission
         android:name="android.permission.WRITE_EXTERNAL_STORAGE"
-        android:maxSdkVersion="32" />
+        android:maxSdkVersion="32"
+        tools:ignore="ScopedStorage" />
 
     <application
         android:allowBackup="true"
@@ -19,6 +20,15 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.CameraXTestAppJava"
         tools:targetApi="31">
+        <activity
+            android:name=".SegpassCameraActivity"
+            android:exported="false" />
+        <activity
+            android:name=".CameraActivityNew"
+            android:exported="false" />
+        <activity
+            android:name=".CameraActivityOld"
+            android:exported="false" />
         <activity
             android:name=".Camera2Activity"
             android:exported="false" />

app/src/main/java/com/example/cameraxtestappjava/CameraActivityNew.java

@@ -0,0 +1,124 @@
+package com.example.cameraxtestappjava;
+
+import static com.example.cameraxtestappjava.segpass.SegpassCamera.REQUEST_CAMERA_PERMISSION;
+
+import android.annotation.SuppressLint;
+import android.content.pm.ActivityInfo;
+import android.os.Bundle;
+
+import androidx.activity.EdgeToEdge;
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+
+import android.Manifest;
+import android.content.pm.PackageManager;
+
+
+import com.example.cameraxtestappjava.segpass.camera.view.AutoFitTextureView;
+import com.example.cameraxtestappjava.segpass.camera.utils.SegpassCameraCallback;
+import com.example.cameraxtestappjava.segpass.camera.utils.SegpassPermissionCallback;
+import com.example.cameraxtestappjava.databinding.ActivityCameraNewBinding;
+import com.example.cameraxtestappjava.segpass.SegpassCamera;
+
+public class CameraActivityNew extends AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCallback, SegpassCameraCallback, SegpassPermissionCallback {
+
+    private static final String TAG = "CameraActivityNew";
+    ActivityCameraNewBinding binding;
+    SegpassCamera mSegpassCamera;
+    AutoFitTextureView mTextureView;
+
+    @SuppressLint("SourceLockedOrientationActivity")
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        EdgeToEdge.enable(this);
+        binding = ActivityCameraNewBinding.inflate(getLayoutInflater());
+        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
+        setContentView(binding.getRoot());
+
+        mTextureView = binding.inCamera2.tvCameraTextureView;
+        mSegpassCamera = new SegpassCamera(this, mTextureView, this, this);
+        setUpListeners();
+
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
+            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
+            return insets;
+        });
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mSegpassCamera.resumeCamera();
+    }
+
+    @Override
+    public void onPause() {
+        mSegpassCamera.pauseCamera();
+        super.onPause();
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
+                                           @NonNull int[] grantResults) {
+        if (requestCode == REQUEST_CAMERA_PERMISSION) {
+            if (grantResults.length != 2 || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
+                onPermissionDenied();
+            }
+        } else {
+            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        }
+    }
+
+    private void setUpListeners() {
+        binding.inCamera2.btnTakePhoto.setOnClickListener(v -> mSegpassCamera.takePicture());
+    }
+
+    /**
+     * Camera callback
+     */
+
+    @Override
+    public void onPictureTakenSuccess(String base64) {
+        mSegpassCamera.showToast("Base64 generated.");
+    }
+
+    @Override
+    public void onPictureTakenFail(String error) {
+        mSegpassCamera.showToast(error);
+    }
+
+    /**
+     * Camera state callback (just to validate if there was an error while initializing the camera)
+     */
+
+    @Override
+    public void onCameraInitError(String errorMessage) {
+        mSegpassCamera.showToast(errorMessage);
+    }
+
+    /**
+     * Permissions callbck
+     */
+
+    @Override
+    public void onPermissionRequest() {
+        requestPermissions(new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CAMERA_PERMISSION);
+    }
+
+    @Override
+    public void onPermissionGranted() {
+        // Do nothing, use camera.
+    }
+
+    @Override
+    public void onPermissionDenied() {
+        mSegpassCamera.showToast("No permissions granted, closing camera.");
+        finish();
+    }
+}

app/src/main/java/com/example/cameraxtestappjava/CameraActivityOld.java

@@ -0,0 +1,35 @@
+package com.example.cameraxtestappjava;
+
+
+import android.os.Bundle;
+
+import androidx.activity.EdgeToEdge;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+
+import com.example.cameraxtestappjava.databinding.ActivityCameraBinding;
+
+public class CameraActivityOld extends AppCompatActivity {
+
+    ActivityCameraBinding binding;
+
+    private static final String TAG = "CameraActivity";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        EdgeToEdge.enable(this);
+
+        binding = ActivityCameraBinding.inflate(getLayoutInflater());
+        setContentView(binding.getRoot());
+
+
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
+            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
+            return insets;
+        });
+    }
+}

app/src/main/java/com/example/cameraxtestappjava/MainActivity.java

@@ -1,24 +1,15 @@
-    package com.example.cameraxtestappjava;
+package com.example.cameraxtestappjava;
 
-import static com.example.cameraxtestappjava.camera.CustomCamera2.REQUEST_CAMERA_PERMISSION;
-
-import android.content.pm.PackageManager;
+import android.content.Intent;
 import android.os.Bundle;
-import android.util.Log;
-import android.view.TextureView;
-import android.widget.ImageButton;
-import android.widget.Toast;
 
 import androidx.activity.EdgeToEdge;
-import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 
 import androidx.core.graphics.Insets;
 import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsCompat;
 
-import com.example.cameraxtestappjava.camera.CustomCamera2;
-import com.example.cameraxtestappjava.camera.CustomCameraCallback;
 import com.example.cameraxtestappjava.databinding.ActivityMainBinding;
 
 public class MainActivity extends AppCompatActivity {
@@ -28,7 +19,6 @@ public class MainActivity extends AppCompatActivity {
 
     // Camera2
     private static final String TAG = "MainActivity";
-    CustomCamera2 mCustomCamera2;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -38,7 +28,7 @@ public class MainActivity extends AppCompatActivity {
         binding = ActivityMainBinding.inflate(getLayoutInflater());
         setContentView(binding.getRoot());
 
-        setUpCamera2();
+        setListeners();
 
         ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
             Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
@@ -47,61 +37,17 @@ public class MainActivity extends AppCompatActivity {
         });
     }
 
-    // Camera 2
-    private void setUpCamera2() {
-
-        // Initialize visual elements in host app
-        TextureView mTextureView = binding.c2Camera.tvCameraTextureView;
-        ImageButton mTakePictureButton = binding.c2Camera.btnTakepicture;
-
-        // Initialized CustomCamera2 in host app
-        mCustomCamera2 = new CustomCamera2(this, mTextureView);
-        mCustomCamera2.init(); // Do not skip this!!!
-
-        mTakePictureButton.setOnClickListener(v -> mCustomCamera2.takePicture(new CustomCameraCallback() {
-            @Override
-            public void onPictureTakenSuccess(String message) {
-                Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
-            }
-
-            @Override
-            public void onPictureTakenFailError(String error) {
-                Toast.makeText(MainActivity.this, error, Toast.LENGTH_LONG).show();
-            }
-        }));
-    }
-
-
-    @Override
-    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
-        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
-        if (requestCode == REQUEST_CAMERA_PERMISSION) {
-            if (grantResults[0] == PackageManager.PERMISSION_DENIED) {
-                // close the app
-                Toast.makeText(MainActivity.this, "Sorry!!!, you can't use this app without granting permission", Toast.LENGTH_LONG).show();
-                finish();
-            }
-        }
+    private void setListeners() {
+        binding.goToCamera.setOnClickListener(v -> {
+            Intent intent = new Intent(this, SegpassCameraActivity.class);
+            startActivity(intent);
+        });
     }
 
     @Override
     protected void onResume() {
         super.onResume();
-        Log.d(TAG, "onResume");
-        mCustomCamera2.resumeCamera();
+        setListeners();
     }
 
-    @Override
-    protected void onPause() {
-        Log.d(TAG, "onPause");
-        mCustomCamera2.pauseCamera();
-        super.onPause();
-    }
-
-    @Override
-    protected void onDestroy() {
-        Log.d(TAG, "onPause");
-        mCustomCamera2.destroyCamera();
-        super.onDestroy();
-    }
 }

app/src/main/java/com/example/cameraxtestappjava/SegpassCameraActivity.java

@@ -0,0 +1,122 @@
+package com.example.cameraxtestappjava;
+
+import static com.example.cameraxtestappjava.segpass.SegpassCamera.REQUEST_CAMERA_PERMISSION;
+
+import android.Manifest;
+import android.annotation.SuppressLint;
+import android.content.pm.ActivityInfo;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+
+import androidx.activity.EdgeToEdge;
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+
+import com.example.cameraxtestappjava.databinding.ActivitySegpassCameraBinding;
+import com.example.cameraxtestappjava.segpass.camera.utils.SegpassCameraCallback;
+import com.example.cameraxtestappjava.segpass.camera.utils.SegpassPermissionCallback;
+import com.example.cameraxtestappjava.segpass.camera.view.SegpassCameraLayout;
+
+public class SegpassCameraActivity extends AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCallback, SegpassCameraCallback, SegpassPermissionCallback  {
+
+    ActivitySegpassCameraBinding binding;
+    SegpassCameraLayout cameraLayout;
+
+    @SuppressLint("SourceLockedOrientationActivity")
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        EdgeToEdge.enable(this);
+
+        binding = ActivitySegpassCameraBinding.inflate(getLayoutInflater());
+        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
+        setContentView(binding.getRoot());
+
+        setCamera();
+
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
+            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
+            return insets;
+        });
+    }
+
+    private void setCamera() {
+        cameraLayout = binding.sclCameraLayout; // Bind SegpassCameraLayout to element in view
+        cameraLayout.init(this, this, this); // Init SegpassCamera
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        cameraLayout.resumeCamera();
+    }
+
+    @Override
+    public void onPause() {
+        cameraLayout.pauseCamera();
+        super.onPause();
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
+                                           @NonNull int[] grantResults) {
+        if (requestCode == REQUEST_CAMERA_PERMISSION) {
+            if (grantResults.length != 2 || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
+                onPermissionDenied();
+            }
+        } else {
+            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        }
+    }
+
+    /**
+     * Camera callback
+     */
+
+    @Override
+    public void onPictureTakenSuccess(String base64) {
+        cameraLayout.showToast("Base64 generated.");
+        this.finish();
+    }
+
+    @Override
+    public void onPictureTakenFail(String error) {
+        cameraLayout.showToast(error);
+        this.finish();
+    }
+
+    /**
+     * Camera state callback (just to validate if there was an error while initializing the camera)
+     */
+
+    @Override
+    public void onCameraInitError(String errorMessage) {
+        cameraLayout.showToast(errorMessage);
+        this.finish();
+    }
+
+    /**
+     * Permissions callbck
+     */
+
+    @Override
+    public void onPermissionRequest() {
+        requestPermissions(new String[]{android.Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CAMERA_PERMISSION);
+    }
+
+    @Override
+    public void onPermissionGranted() {
+        // Do nothing, use camera.
+    }
+
+    @Override
+    public void onPermissionDenied() {
+        cameraLayout.showToast("No permissions granted, closing camera.");
+        finish();
+    }
+}

app/src/main/java/com/example/cameraxtestappjava/camera/CustomCamera.java

@@ -1,108 +0,0 @@
-package com.example.cameraxtestappjava.camera;
-
-import android.content.ContentValues;
-import android.content.Context;
-import android.net.Uri;
-import android.os.Build;
-import android.provider.MediaStore;
-
-import androidx.annotation.NonNull;
-import androidx.camera.core.CameraSelector;
-import androidx.camera.core.ImageCapture;
-import androidx.camera.core.ImageCaptureException;
-import androidx.camera.core.Preview;
-import androidx.camera.lifecycle.ProcessCameraProvider;
-import androidx.camera.view.PreviewView;
-import androidx.core.content.ContextCompat;
-import androidx.lifecycle.LifecycleOwner;
-
-import com.google.common.util.concurrent.ListenableFuture;
-
-import java.util.concurrent.ExecutionException;
-
-public class CustomCamera {
-    ProcessCameraProvider mCameraProvider;
-    ImageCapture imageCapture;
-    ImageCapture.OutputFileOptions outputFileOptions;
-    ListenableFuture<ProcessCameraProvider> cameraProviderFuture;
-    ContentValues contentValues;
-    String fileName;
-    Uri tempFileUri;
-
-    Context mContext;
-
-    PreviewView mPreviewView;
-
-
-    public CustomCamera(Context context, PreviewView previewView) {
-        mContext = context;
-        mPreviewView = previewView;
-    }
-
-    public void setUpCamera() {
-        cameraProviderFuture = ProcessCameraProvider.getInstance(mContext);
-        cameraProviderFuture.addListener(() -> {
-            try {
-                mCameraProvider = cameraProviderFuture.get();
-                startCustomCamera();
-            } catch (ExecutionException | InterruptedException e) {
-                throw new RuntimeException(e);
-            }
-
-        }, ContextCompat.getMainExecutor(mContext)); // por parametro
-    }
-
-    private void startCustomCamera() {
-
-        CameraSelector cameraSelector = CameraSelector.DEFAULT_FRONT_CAMERA;
-        Preview preview = new Preview.Builder().build();
-        preview.setSurfaceProvider(mPreviewView.getSurfaceProvider());
-
-        imageCapture = new ImageCapture.Builder().build();
-
-        try {
-            mCameraProvider.unbindAll();
-            mCameraProvider.bindToLifecycle((LifecycleOwner) mContext, cameraSelector, preview, imageCapture);
-
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-
-    }
-
-    @NonNull
-    private ImageCapture.OutputFileOptions getOutputFileOptions(String name) {
-        contentValues = new ContentValues();
-        contentValues.put(MediaStore.MediaColumns.DISPLAY_NAME, name);
-        contentValues.put(MediaStore.MediaColumns.MIME_TYPE, "image/jpeg");
-
-        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.P) {
-            contentValues.put(MediaStore.Images.Media.RELATIVE_PATH, "Pictures/CameraXTestApp");
-        }
-
-        return new ImageCapture.OutputFileOptions.Builder(
-                mContext.getContentResolver(), MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues
-        ).build();
-    }
-
-    public void capturePhoto(CustomCameraCallback callback) {
-        if (imageCapture == null) return;
-
-        fileName = System.currentTimeMillis() + "";
-        outputFileOptions = getOutputFileOptions(fileName);
-
-        imageCapture.takePicture(outputFileOptions, ContextCompat.getMainExecutor(mContext), new ImageCapture.OnImageSavedCallback() {
-            @Override
-            public void onImageSaved(@NonNull ImageCapture.OutputFileResults outputFileResults) {
-                tempFileUri = outputFileResults.getSavedUri();
-                callback.onPictureTakenSuccess("Image saved! " + tempFileUri);
-            }
-
-            @Override
-            public void onError(@NonNull ImageCaptureException exception) {
-                callback.onPictureTakenFailError("Image Not Saved " + exception.getMessage());
-            }
-        });
-
-    }
-}

app/src/main/java/com/example/cameraxtestappjava/camera/CustomCamera2.java

@@ -1,503 +0,0 @@
-package com.example.cameraxtestappjava.camera;
-
-import android.content.Context;
-import android.content.pm.PackageManager;
-import android.graphics.ImageFormat;
-import android.graphics.SurfaceTexture;
-import android.hardware.camera2.CameraAccessException;
-import android.hardware.camera2.CameraCaptureSession;
-import android.hardware.camera2.CameraCharacteristics;
-import android.hardware.camera2.CameraDevice;
-import android.hardware.camera2.CameraManager;
-import android.hardware.camera2.CameraMetadata;
-import android.hardware.camera2.CaptureRequest;
-import android.hardware.camera2.TotalCaptureResult;
-import android.hardware.camera2.params.StreamConfigurationMap;
-import android.media.Image;
-import android.media.ImageReader;
-import android.os.Build;
-import android.os.Environment;
-import android.os.Handler;
-import android.os.HandlerThread;
-import android.util.Log;
-import android.util.Size;
-import android.util.SparseIntArray;
-import android.view.Surface;
-import android.view.TextureView;
-import android.widget.Toast;
-
-import androidx.annotation.NonNull;
-import androidx.appcompat.app.AppCompatActivity;
-import androidx.core.app.ActivityCompat;
-
-import java.io.File;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.OutputStream;
-import java.nio.ByteBuffer;
-import java.nio.file.Files;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.List;
-
-public class CustomCamera2 {
-    private static final String TAG = "SegpassCamera";
-
-    Context mContext;
-    AppCompatActivity mActivity;
-    private TextureView mTextureView;
-    private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
-
-    static {
-        ORIENTATIONS.append(Surface.ROTATION_0, 90);
-        ORIENTATIONS.append(Surface.ROTATION_90, 0);
-        ORIENTATIONS.append(Surface.ROTATION_180, 270);
-        ORIENTATIONS.append(Surface.ROTATION_270, 180);
-    }
-
-    private String mCameraId;
-    private String mDefaultCameraId = "0";
-    private Size mPreviewSize;
-    private int mTotalRotation;
-    protected CameraDevice mCameraDevice;
-    protected String[] mCameraIds;
-    protected CameraManager mCameraManager;
-    protected CameraCaptureSession mCameraCaptureSessions;
-    private Size mImageDimension;
-    private ImageReader mImageReader;
-    private File mFileFolder;
-    private File mFile;
-    public static final int REQUEST_CAMERA_PERMISSION = 200;
-    private Handler mBackgroundHandler;
-    private HandlerThread mBackgroundThread;
-    private CaptureRequest.Builder mCaptureRequestBuilder;
-
-    private static class CompareSizeByArea implements Comparator<Size> {
-
-        @Override
-        public int compare(Size ths, Size rhs) {
-            return Long.signum((long) ths.getWidth() * ths.getHeight() /
-                    (long) rhs.getWidth() * rhs.getHeight());
-        }
-    }
-
-    public CustomCamera2(Context context, TextureView textureView) {
-        mContext = context;
-        mTextureView = textureView;
-    }
-
-    public CustomCamera2(AppCompatActivity activity, TextureView textureView) {
-        mActivity = activity;
-        mTextureView = textureView;
-    }
-
-    public void init() {
-        createFolder();
-        setUpListeners();
-    }
-
-    private void setUpListeners() {
-        mTextureView.setSurfaceTextureListener(textureListener);
-    }
-
-
-    public TextureView.SurfaceTextureListener textureListener = new TextureView.SurfaceTextureListener() {
-        @Override
-        public void onSurfaceTextureAvailable(@NonNull SurfaceTexture surface, int width, int height) {
-            //open your camera here
-            setupCamera(width, height);
-            connectCamera();
-            startPreview();
-        }
-
-        @Override
-        public void onSurfaceTextureSizeChanged(@NonNull SurfaceTexture surface, int width, int height) {
-            // Transform you image captured size according to the surface width and height
-            closeCamera();
-            setupCamera(width, height);
-            connectCamera();
-            startPreview();
-        }
-
-        @Override
-        public boolean onSurfaceTextureDestroyed(@NonNull SurfaceTexture surface) {
-            return false;
-        }
-
-        @Override
-        public void onSurfaceTextureUpdated(@NonNull SurfaceTexture surface) {
-            //Log.d(TAG, "Texture Updated!");
-        }
-    };
-
-    // Camera Device State Callback
-    private CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
-        @Override
-        public void onOpened(@NonNull CameraDevice camera) {
-            //This is called when the camera is open
-            Log.e(TAG, "onOpened");
-            mCameraDevice = camera; // ???????
-        }
-
-        @Override
-        public void onDisconnected(@NonNull CameraDevice camera) {
-            mCameraDevice.close();
-        }
-
-        @Override
-        public void onError(@NonNull CameraDevice camera, int error) {
-            mCameraDevice.close();
-            mCameraDevice = null;
-        }
-    };
-
-    //Background Thread
-    public void startBackgroundThread() {
-        mBackgroundThread = new HandlerThread("Camera Background");
-        mBackgroundThread.start();
-        mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
-    }
-
-    public void stopBackgroundThread() {
-        mBackgroundThread.quitSafely();
-        try {
-            mBackgroundThread.join();
-            mBackgroundThread = null;
-            mBackgroundHandler = null;
-        } catch (InterruptedException e) {
-            e.printStackTrace();
-        }
-    }
-
-    // Setup Camera
-    private CameraCharacteristics getCameraCharacteristics() {
-        try {
-            for (String cameraId : mCameraIds) {
-
-                // Local cc
-                CameraCharacteristics cc = mCameraManager.getCameraCharacteristics(cameraId);
-
-                // If no LENS_FACING characteristic is found, NullPointerException
-                if (cc.get(CameraCharacteristics.LENS_FACING) == null)
-                    throw new NullPointerException();
-
-                if (cc.get(CameraCharacteristics.LENS_FACING) == CameraMetadata.LENS_FACING_FRONT) {
-                    mCameraId = cameraId;
-                } else {
-                    mCameraId = mDefaultCameraId;
-                }
-            }
-            return mCameraManager.getCameraCharacteristics(mCameraId);
-        } catch (NullPointerException | CameraAccessException e) {
-            return null;
-        }
-    }
-
-    public void setupCamera(int width, int height) {
-        Log.d(TAG, "ENTRO ACA " + width + " " + height);
-        // Shenanigans for the TextureView
-
-        mCameraManager = (CameraManager) mActivity.getSystemService(Context.CAMERA_SERVICE);
-
-        try {
-            mCameraIds = mCameraManager.getCameraIdList();
-            Log.d(TAG, "eeeeeee " + mCameraIds.length);
-            for (String cameraId : mCameraManager.getCameraIdList()) {
-                //tv.append(cameraId + "\n");
-            }
-        } catch (CameraAccessException e) {
-            //tv.append("ERROR: CAMERA NOT FOUND\n");
-        }
-
-        try {
-            CameraCharacteristics cameraCharacteristics = getCameraCharacteristics();
-            // If no characteristics are found, throw a CameraAccessException
-            if (cameraCharacteristics == null)
-                throw new CameraAccessException(CameraAccessException.CAMERA_ERROR);
-
-            // Shenanigans
-            StreamConfigurationMap map = cameraCharacteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
-            int deviceOrientation = mActivity.getWindowManager().getDefaultDisplay().getRotation();
-            mTotalRotation = sensorToDeviceRotation(cameraCharacteristics, deviceOrientation);
-            boolean swapRotation = mTotalRotation == 90 || mTotalRotation == 270;
-            int rotatedWidth = width;
-            int rotatedHeight = height;
-            if (swapRotation) {
-                rotatedWidth = height;
-                rotatedHeight = width;
-            }
-            assert map != null;
-            mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class), rotatedWidth, rotatedHeight);
-            //mVideoSize = chooseOptimalSize(map.getOutputSizes(MediaRecorder.class), rotatedWidth, rotatedHeight);
-
-        } catch (CameraAccessException e) {
-            e.printStackTrace();
-        }
-    }
-
-    //Connect Camera
-    public void connectCamera() {
-        try {
-            if (ActivityCompat.checkSelfPermission(mActivity, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mActivity, android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
-                ActivityCompat.requestPermissions(mActivity, new String[]{android.Manifest.permission.CAMERA, android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CAMERA_PERMISSION);
-                return;
-            }
-            mCameraManager.openCamera(mCameraId, mStateCallback, mBackgroundHandler);
-        } catch (CameraAccessException e) {
-            e.printStackTrace();
-        } catch (SecurityException e) {
-            e.printStackTrace();
-        }
-    }
-
-    //  Start Preview
-    public void startPreview() {
-        SurfaceTexture surfaceTexture = mTextureView.getSurfaceTexture();
-        assert surfaceTexture != null;
-        surfaceTexture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
-        Surface previewSurface = new Surface(surfaceTexture);
-
-        try {
-            mCaptureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
-            mCaptureRequestBuilder.addTarget(previewSurface);
-            mCaptureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
-            mCaptureRequestBuilder.set(CaptureRequest.CONTROL_VIDEO_STABILIZATION_MODE, CameraMetadata.CONTROL_VIDEO_STABILIZATION_MODE_ON);
-
-            mCameraDevice.createCaptureSession(Collections.singletonList(previewSurface),
-                    new CameraCaptureSession.StateCallback() {
-                        @Override
-                        public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
-                            try {
-                                cameraCaptureSession.setRepeatingRequest(mCaptureRequestBuilder.build(), null, mBackgroundHandler);
-                            } catch (CameraAccessException e) {
-                                Log.e(TAG, "Camera can be accessed.");
-                            }
-                        }
-
-                        @Override
-                        public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
-                            Toast.makeText(mActivity, "Configuration change", Toast.LENGTH_SHORT).show();
-                        }
-                    }, null);
-
-        } catch (CameraAccessException e) {
-            Log.e(TAG, "DAMN");
-        }
-    }
-
-    //Take Picture
-    public void takePicture(CustomCameraCallback cameraCallback) {
-        if (mCameraDevice == null) {
-            Log.e(TAG, "cameraDevice is null");
-            return;
-        }
-        try {
-            CameraCharacteristics characteristics = getCameraCharacteristics();
-            if (characteristics == null)
-                throw new CameraAccessException(CameraAccessException.CAMERA_ERROR);
-
-            Size[] jpegSizes = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP).getOutputSizes(ImageFormat.JPEG);
-            if (jpegSizes == null) throw new NullPointerException("Error taking picture");
-
-            int width = 640;
-            int height = 480;
-
-            if (jpegSizes.length > 0) {
-                width = jpegSizes[0].getWidth();
-                height = jpegSizes[0].getHeight();
-            }
-
-            ImageReader mReader = ImageReader.newInstance(width, height, ImageFormat.JPEG, 1);
-
-            List<Surface> outputSurfaces = new ArrayList<Surface>(2);
-            outputSurfaces.add(mReader.getSurface());
-            outputSurfaces.add(new Surface(mTextureView.getSurfaceTexture()));
-
-            final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
-            captureBuilder.addTarget(mReader.getSurface());
-            captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
-
-            // Orientation
-            int rotation = mActivity.getWindowManager().getDefaultDisplay().getRotation();
-            captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));
-            String fileName = "IMG_" + System.currentTimeMillis() + ".jpg";
-            mFile = new File(mFileFolder + "/" + fileName); // Ver como hacer para guardar en la carpeta de la app
-
-            ImageReader.OnImageAvailableListener readerListener = iReader -> {
-                try (Image image = iReader.acquireLatestImage()) {
-                    ByteBuffer buffer = image.getPlanes()[0].getBuffer();
-                    byte[] bytes = new byte[buffer.capacity()];
-                    buffer.get(bytes);
-                    savePicture(bytes);
-                } catch (IOException e) {
-                    cameraCallback.onPictureTakenFailError(e.getMessage());
-                }
-            };
-
-            mReader.setOnImageAvailableListener(readerListener, mBackgroundHandler);
-            final CameraCaptureSession.CaptureCallback captureListener = new CameraCaptureSession.CaptureCallback() {
-                @Override
-                public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
-                    super.onCaptureCompleted(session, request, result);
-                    Log.d(TAG, "file");
-                    //Toast.makeText(mActivity, "Saved:" + mFile, Toast.LENGTH_SHORT).show();
-                    createCameraPreview();
-                    cameraCallback.onPictureTakenSuccess("Saved:" + mFile);
-                }
-            };
-
-            mCameraDevice.createCaptureSession(outputSurfaces, new CameraCaptureSession.StateCallback() {
-                @Override
-                public void onConfigured(@NonNull CameraCaptureSession session) {
-                    try {
-                        session.capture(captureBuilder.build(), captureListener, mBackgroundHandler);
-                    } catch (CameraAccessException e) {
-                        e.printStackTrace();
-                    }
-                }
-
-                @Override
-                public void onConfigureFailed(@NonNull CameraCaptureSession session) {
-                }
-            }, mBackgroundHandler);
-        } catch (CameraAccessException e) {
-            cameraCallback.onPictureTakenFailError(e.getMessage());
-        }
-    }
-
-    private void savePicture(byte[] bytes) throws IOException {
-        OutputStream output = null;
-        try {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-                output = Files.newOutputStream(mFile.toPath());
-            } else {
-                output = new FileOutputStream(mFile);
-            }
-            output.write(bytes);
-        } finally {
-            if (output != null) {
-                output.close();
-            }
-        }
-    }
-
-    protected void createCameraPreview() {
-        try {
-            CameraCharacteristics cc = getCameraCharacteristics();
-
-            StreamConfigurationMap map = cc.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
-            assert map != null;
-            mImageDimension = map.getOutputSizes(SurfaceTexture.class)[0];
-
-            SurfaceTexture texture = mTextureView.getSurfaceTexture();
-            assert texture != null;
-            texture.setDefaultBufferSize(mImageDimension.getWidth(), mImageDimension.getHeight());
-            Surface surface = new Surface(texture);
-            mCaptureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
-            mCaptureRequestBuilder.addTarget(surface);
-            mCameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {
-                @Override
-                public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
-                    //The camera is already closed
-                    if (null == mCameraDevice) {
-                        return;
-                    }
-                    // When the session is ready, we start displaying the preview.
-                    mCameraCaptureSessions = cameraCaptureSession;
-                    updatePreview();
-                }
-
-                @Override
-                public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
-                    Toast.makeText(mActivity, "Configuration change", Toast.LENGTH_SHORT).show();
-                }
-            }, null);
-        } catch (CameraAccessException e) {
-            e.printStackTrace();
-        }
-    }
-
-    protected void updatePreview() {
-        if (null == mCameraDevice) {
-            Log.e(TAG, "updatePreview error, return");
-        }
-        mCaptureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
-        try {
-            mCameraCaptureSessions.setRepeatingRequest(mCaptureRequestBuilder.build(), null, mBackgroundHandler);
-        } catch (CameraAccessException e) {
-            e.printStackTrace();
-        }
-    }
-
-    public void closeCamera() {
-        if (null != mCameraDevice) {
-            mCameraDevice.close();
-            mCameraDevice = null;
-        }
-        if (null != mImageReader) {
-            mImageReader.close();
-            mImageReader = null;
-        }
-    }
-
-    private static int sensorToDeviceRotation(CameraCharacteristics cameraCharacteristics, int deviceOrientation) {
-        int sensorOrienatation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
-        deviceOrientation = ORIENTATIONS.get(deviceOrientation);
-        return (sensorOrienatation + deviceOrientation + 360) % 360;
-
-    }
-
-    private static Size chooseOptimalSize(Size[] choices, int textureViewWidth,
-                                          int textureViewHeight) {
-
-        // Collect the supported resolutions that are at least as big as the preview Surface
-        List<Size> bigEnough = new ArrayList<>();
-        // Collect the supported resolutions that are smaller than the preview Surface
-
-        for (Size option : choices) {
-            if (option.getHeight() == option.getWidth() * textureViewHeight / textureViewWidth &&
-                    option.getWidth() >= textureViewWidth &&
-                    option.getHeight() >= textureViewHeight) {
-                bigEnough.add(option);
-            }
-        }
-        // Pick the smallest of those big enough. If there is no one big enough, pick the
-        // largest of those not big enough.
-        if (!bigEnough.isEmpty()) {
-            return Collections.min(bigEnough, new CompareSizeByArea());
-        } else {
-            Log.e(TAG, "Couldn't find any suitable preview size");
-            return choices[0];
-        }
-    }
-
-    private void createFolder() {
-        File folder = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
-        mFileFolder = new File(folder, "Camera2TestApp");
-        if (!mFileFolder.exists()) {
-            mFileFolder.mkdirs();
-        }
-    }
-
-    public void resumeCamera() {
-        startBackgroundThread();
-        if (mTextureView.isAvailable()) {
-            setupCamera(mTextureView.getWidth(), mTextureView.getHeight());
-            connectCamera();
-            startPreview();
-        } else {
-            mTextureView.setSurfaceTextureListener(textureListener);
-        }
-    }
-
-    public void pauseCamera() {
-        closeCamera();
-        stopBackgroundThread();
-    }
-
-    public void destroyCamera() {
-        closeCamera();
-    }
-}

app/src/main/java/com/example/cameraxtestappjava/camera/CustomCameraCallback.java

@@ -1,9 +0,0 @@
-package com.example.cameraxtestappjava.camera;
-
-public interface CustomCameraCallback {
-
-    void onPictureTakenSuccess(String message);
-    void onPictureTakenFailError(String error);
-
-
-}

app/src/main/java/com/example/cameraxtestappjava/segpass/SegpassCamera.java

@@ -0,0 +1,817 @@
+package com.example.cameraxtestappjava.segpass;
+
+import android.Manifest;
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.content.res.Configuration;
+import android.graphics.ImageFormat;
+import android.graphics.Matrix;
+import android.graphics.Point;
+import android.graphics.RectF;
+import android.graphics.SurfaceTexture;
+import android.hardware.camera2.CameraAccessException;
+import android.hardware.camera2.CameraCaptureSession;
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CameraDevice;
+import android.hardware.camera2.CameraManager;
+import android.hardware.camera2.CameraMetadata;
+import android.hardware.camera2.CaptureRequest;
+import android.hardware.camera2.TotalCaptureResult;
+import android.hardware.camera2.params.StreamConfigurationMap;
+import android.media.Image;
+import android.media.ImageReader;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.util.Log;
+import android.util.Size;
+import android.util.SparseIntArray;
+import android.view.Surface;
+import android.view.TextureView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+
+import com.example.cameraxtestappjava.segpass.camera.exceptions.SegpassCameraException;
+import com.example.cameraxtestappjava.segpass.camera.utils.CompareSizesByArea;
+import com.example.cameraxtestappjava.segpass.camera.utils.ImageSaverUtil;
+import com.example.cameraxtestappjava.segpass.camera.utils.ImageEncodingCallback;
+import com.example.cameraxtestappjava.segpass.camera.utils.SegpassCameraCallback;
+import com.example.cameraxtestappjava.segpass.camera.utils.SegpassPermissionCallback;
+import com.example.cameraxtestappjava.segpass.camera.view.AutoFitTextureView;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.TimeUnit;
+
+public class SegpassCamera {
+
+    /**
+     * Tag for the {@link Log}.
+     */
+    private static final String TAG = "SegpassCamera";
+
+    /**
+     * Class variables
+     */
+    AppCompatActivity mActivity;
+    SegpassPermissionCallback mPermissionListener;
+    SegpassCameraCallback mCameraCallback;
+
+    /**
+     * Conversion from screen rotation to JPEG orientation.
+     */
+    private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
+    public static final int REQUEST_CAMERA_PERMISSION = 200;
+
+    static {
+        ORIENTATIONS.append(Surface.ROTATION_0, 90);
+        ORIENTATIONS.append(Surface.ROTATION_90, 0);
+        ORIENTATIONS.append(Surface.ROTATION_180, 270);
+        ORIENTATIONS.append(Surface.ROTATION_270, 180);
+    }
+
+    /**
+     * Max preview width that is guaranteed by Camera2 API
+     */
+    private static final int MAX_PREVIEW_WIDTH = 1920;
+
+    /**
+     * Max preview height that is guaranteed by Camera2 API
+     */
+    private static final int MAX_PREVIEW_HEIGHT = 1080;
+
+    /**
+     * Error constants
+     */
+    private static final String ERROR_MSG_CAMERA_ACCESS = "Error de acceso a cámara.";
+    private static final String ERROR_MSG_CAMERA_RUNTIME = "Error en ejecución de cámara.";
+    private static final String ERROR_MSG_CAMERA_CONFIG_FAILED = "Error en configuración de cámara.";
+    private static final String ERROR_MSG_CAMERA_TIMEOUT = "Tiempo de espera para bloqueo de cámara excedido.";
+    private static final String ERROR_MSG_NO_CAMERA_PREVIEW_SIZE = "No se encontraron tamaños de imagen compatible.";
+    private static final String ERROR_MSG_NO_CAMERA_CONFIGURATION_FOUND = "Error: no se encontró configuración de cámara";
+
+    private static final String ERROR_STATE_MSG_CAMERA_IN_USE = "Error: cámara en uso por otro proceso.";
+    private static final String ERROR_STATE_MSG_MAX_CAMERAS_IN_USE = "Error: máximo número de camaras en uso.";
+    private static final String ERROR_STATE_MSG_CAMERA_DISABLED = "Error: cámara inhabilitada.";
+    private static final String ERROR_STATE_MSG_CAMERA_DEVICE = "Error fatal en cámara. Intente reiniciar aplicación o dispositivo.";
+    private static final String ERROR_STATE_MSG_CAMERA_SERVICE = "Error fatal en cámara. Intente reiniciar dispositivo.";
+
+    /**
+     * ID of the current {@link CameraDevice}.
+     */
+    private String mCameraId;
+
+    /**
+     * An {@link AutoFitTextureView} for camera preview.
+     */
+    private final AutoFitTextureView mTextureView;
+
+    /**
+     * A {@link CameraCaptureSession } for camera preview.
+     */
+    private CameraCaptureSession mCaptureSession;
+
+    /**
+     * A reference to the opened {@link CameraDevice}.
+     */
+    private CameraDevice mCameraDevice;
+
+    /**
+     * The {@link android.util.Size} of camera preview.
+     */
+    private Size mPreviewSize;
+
+    /**
+     * An additional thread for running tasks that shouldn't block the UI.
+     */
+    private HandlerThread mBackgroundThread;
+
+    /**
+     * A {@link Handler} for running tasks in the background.
+     */
+    private Handler mBackgroundHandler;
+
+    /**
+     * An {@link ImageReader} that handles still image capture.
+     */
+    private ImageReader mImageReader;
+
+    /**
+     * This is the resulting image encoded to Base64
+     */
+    private String mBase64Value;
+
+    /**
+     * The image file to show on the preview to accept or discard
+     */
+    private Image mImage;
+
+    /**
+     * {@link CaptureRequest.Builder} for the camera preview
+     */
+    private CaptureRequest.Builder mPreviewRequestBuilder;
+
+    /**
+     * {@link CaptureRequest} generated by {@link #mPreviewRequestBuilder}
+     */
+    private CaptureRequest mPreviewRequest;
+
+    /**
+     * A {@link Semaphore} to prevent the app from exiting before closing the camera.
+     */
+    private final Semaphore mCameraOpenCloseLock = new Semaphore(1);
+
+    /**
+     * Orientation of the camera sensor
+     */
+    private int mSensorOrientation;
+
+    /**
+     * @param activity       Parent activity where the camera is called from.
+     * @param textureView    {@link AutoFitTextureView} where the camera preview is shown.
+     * @param listener       {@link SegpassPermissionCallback} that deals with camera and storage permissions.
+     * @param cameraCallback {@link SegpassCameraCallback} that deals with operation results.
+     */
+    public SegpassCamera(AppCompatActivity activity, AutoFitTextureView textureView, SegpassPermissionCallback listener, SegpassCameraCallback cameraCallback) {
+        mActivity = activity;
+        mTextureView = textureView;
+        mPermissionListener = listener;
+        mCameraCallback = cameraCallback;
+    }
+
+    /**
+     * {@link TextureView.SurfaceTextureListener} handles several lifecycle events on a
+     * {@link TextureView}.
+     */
+    private final TextureView.SurfaceTextureListener mSurfaceTextureListener
+            = new TextureView.SurfaceTextureListener() {
+
+        @Override
+        public void onSurfaceTextureAvailable(SurfaceTexture texture, int width, int height) {
+            openCamera(width, height);
+        }
+
+        @Override
+        public void onSurfaceTextureSizeChanged(SurfaceTexture texture, int width, int height) {
+            configureTransform(width, height);
+        }
+
+        @Override
+        public boolean onSurfaceTextureDestroyed(SurfaceTexture texture) {
+            return true;
+        }
+
+        @Override
+        public void onSurfaceTextureUpdated(SurfaceTexture texture) {
+            // No code implementation needed for this use case.
+        }
+
+    };
+
+    /**
+     * {@link CameraDevice.StateCallback} is called when {@link CameraDevice} changes its state.
+     */
+    private final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
+
+        @Override
+        public void onOpened(@NonNull CameraDevice cameraDevice) {
+            // This method is called when the camera is opened.  We start camera preview here.
+            mCameraOpenCloseLock.release();
+            mCameraDevice = cameraDevice;
+            createCameraPreviewSession();
+        }
+
+        @Override
+        public void onDisconnected(@NonNull CameraDevice cameraDevice) {
+            mCameraOpenCloseLock.release();
+            cameraDevice.close();
+            mCameraDevice = null;
+        }
+
+        @Override
+        public void onError(@NonNull CameraDevice cameraDevice, int error) {
+            mCameraOpenCloseLock.release();
+            cameraDevice.close();
+            mCameraDevice = null;
+            switch (error) {
+                case CameraDevice.StateCallback.ERROR_CAMERA_IN_USE:
+                    mCameraCallback.onCameraInitError(ERROR_STATE_MSG_CAMERA_IN_USE);
+                    break;
+                case CameraDevice.StateCallback.ERROR_MAX_CAMERAS_IN_USE:
+                    mCameraCallback.onCameraInitError(ERROR_STATE_MSG_MAX_CAMERAS_IN_USE);
+                    break;
+                case CameraDevice.StateCallback.ERROR_CAMERA_DISABLED:
+                    mCameraCallback.onCameraInitError(ERROR_STATE_MSG_CAMERA_DISABLED);
+                    break;
+                case CameraDevice.StateCallback.ERROR_CAMERA_DEVICE:
+                    mCameraCallback.onCameraInitError(ERROR_STATE_MSG_CAMERA_DEVICE);
+                    break;
+                default:
+                    mCameraCallback.onCameraInitError(ERROR_STATE_MSG_CAMERA_SERVICE);
+                    break;
+            }
+        }
+
+    };
+
+    /**
+     * {@link ImageEncodingCallback} that deals with Base64 transformation.
+     */
+    private final ImageEncodingCallback base64Callback = new ImageEncodingCallback() {
+        @Override
+        public void onImageEncodeSuccess(String base64) {
+            Log.d(TAG, "onBase64TransformationSuccess@base64Callback: image encoded successfully.");
+            mBase64Value = base64;
+            mCameraCallback.onPictureTakenSuccess(mBase64Value);
+        }
+
+        @Override
+        public void onImageEncodeFail(String error) {
+            Log.e(TAG, "onBase64TransformationSuccess@base64Callback" + error);
+            mBase64Value = null;
+            mCameraCallback.onPictureTakenFail(error);
+        }
+    };
+
+
+    /**
+     * This a callback object for the {@link ImageReader}. "onImageAvailable" will be called when a
+     * still image is ready to be saved (or sent to be encoded to base64)
+     */
+    private final ImageReader.OnImageAvailableListener mOnImageAvailableListener = reader -> mImage = reader.acquireNextImage();
+
+
+    /**
+     * Starts a background thread and its {@link Handler}.
+     */
+    private void startBackgroundThread() {
+        mBackgroundThread = new HandlerThread("CameraBackground");
+        mBackgroundThread.start();
+        mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
+    }
+
+    /**
+     * Stops the background thread and its {@link Handler}.
+     */
+    private void stopBackgroundThread() {
+        mBackgroundThread.quitSafely();
+        try {
+            mBackgroundThread.join();
+            mBackgroundThread = null;
+            mBackgroundHandler = null;
+        } catch (InterruptedException e) {
+            mBackgroundThread.interrupt();
+            Log.d(TAG, "InterruptedException@stopBackgroundThread(): " + e.getMessage());
+        }
+    }
+
+    /**
+     * Starts or resume a Camera. Must be invoked after {@link Activity} super.onResume().
+     */
+    public void resumeCamera() {
+        startBackgroundThread();
+
+        // When the screen is turned off and turned back on, the SurfaceTexture is already
+        // available, and "onSurfaceTextureAvailable" will not be called. In that case, we can open
+        // a camera and start preview from here (otherwise, we wait until the surface is ready in
+        // the SurfaceTextureListener).
+        if (mTextureView.isAvailable()) {
+            openCamera(mTextureView.getWidth(), mTextureView.getHeight());
+        } else {
+            mTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
+        }
+    }
+
+    /**
+     * Pauses the camera (when the application leaves the activity or the app is sent to
+     * background. Must be invoked before {@link Activity} super.onPause().
+     */
+    public void pauseCamera() {
+        closeCamera();
+        stopBackgroundThread();
+    }
+
+    /**
+     * Shows a {@link Toast} on the UI thread.
+     *
+     * @param text The message to show
+     */
+    public void showToast(String text) {
+        mActivity.runOnUiThread(() -> Toast.makeText(mActivity, text, Toast.LENGTH_LONG).show());
+    }
+
+    /**
+     * Given {@code choices} of {@code Size}s supported by a camera, choose the smallest one that
+     * is at least as large as the respective texture view size, and that is at most as large as the
+     * respective max size, and whose aspect ratio matches with the specified value. If such size
+     * doesn't exist, choose the largest one that is at most as large as the respective max size,
+     * and whose aspect ratio matches with the specified value.
+     *
+     * @param choices           The list of sizes that the camera supports for the intended output
+     *                          class
+     * @param textureViewWidth  The width of the texture view relative to sensor coordinate
+     * @param textureViewHeight The height of the texture view relative to sensor coordinate
+     * @param maxWidth          The maximum width that can be chosen
+     * @param maxHeight         The maximum height that can be chosen
+     * @param aspectRatio       The aspect ratio
+     * @return The optimal {@code Size}, or an arbitrary one if none were big enough
+     */
+    private static Size chooseOptimalSize(Size[] choices, int textureViewWidth,
+                                          int textureViewHeight, int maxWidth, int maxHeight, Size aspectRatio) {
+
+        // Collect the supported resolutions that are at least as big as the preview Surface
+        List<Size> bigEnough = new ArrayList<>();
+        // Collect the supported resolutions that are smaller than the preview Surface
+        List<Size> notBigEnough = new ArrayList<>();
+        int w = aspectRatio.getWidth();
+        int h = aspectRatio.getHeight();
+        for (Size option : choices) {
+            if (option.getWidth() <= maxWidth && option.getHeight() <= maxHeight &&
+                    option.getHeight() == option.getWidth() * h / w) {
+                if (option.getWidth() >= textureViewWidth &&
+                        option.getHeight() >= textureViewHeight) {
+                    bigEnough.add(option);
+                } else {
+                    notBigEnough.add(option);
+                }
+            }
+        }
+
+        // Pick the smallest of those big enough. If there is no one big enough, pick the
+        // largest of those not big enough.
+        if (!bigEnough.isEmpty()) {
+            return Collections.min(bigEnough, new CompareSizesByArea());
+        } else if (!notBigEnough.isEmpty()) {
+            return Collections.max(notBigEnough, new CompareSizesByArea());
+        } else {
+            Log.e(TAG, "Couldn't find any suitable preview size");
+            return choices[0];
+        }
+    }
+
+    /**
+     * Sets up member variables related to camera.
+     *
+     * @param width  The width of available size for camera preview
+     * @param height The height of available size for camera preview
+     */
+    private void setUpCameraOutputs(int width, int height) {
+        CameraManager manager = (CameraManager) mActivity.getSystemService(Context.CAMERA_SERVICE);
+        try {
+            for (String cameraId : manager.getCameraIdList()) {
+                CameraCharacteristics characteristics
+                        = manager.getCameraCharacteristics(cameraId);
+
+                StreamConfigurationMap map = getStreamConfigurationMap(characteristics);
+                if (map == null) continue;
+
+                // For still image captures, we use the largest available size.
+                Size largest = Collections.max(
+                        Arrays.asList(map.getOutputSizes(ImageFormat.JPEG)),
+                        new CompareSizesByArea());
+
+                setImageReaderListeners(largest);
+
+                boolean swappedDimensions = isSwappedDimensions(characteristics);
+
+                getOptimalPreviewSize(width, height, swappedDimensions, map, largest);
+
+                setPreviewAspectRatio();
+
+                mCameraId = cameraId;
+                return;
+            }
+        } catch (CameraAccessException e) {
+            Log.e(TAG, "CameraAccessException@setUpCameraOutputs(): " + e.getMessage());
+            mCameraCallback.onCameraInitError(ERROR_MSG_CAMERA_ACCESS);
+        } catch (NullPointerException e) {
+            Log.e(TAG, "NullPointerException@setUpCameraOutputs(): " + e.getMessage());
+            mCameraCallback.onCameraInitError(ERROR_MSG_NO_CAMERA_CONFIGURATION_FOUND);
+        }
+    }
+
+    /**
+     * Validates whether the camera's current rotation is different from the output shown in the
+     * preview {@link AutoFitTextureView}
+     *
+     * @param characteristics Camera characteristics
+     * @return boolean value for display rotation
+     */
+    private boolean isSwappedDimensions(CameraCharacteristics characteristics) {
+        // Find out if we need to swap dimension to get the preview size relative to sensor
+        // coordinate.
+        int displayRotation = mActivity.getWindowManager().getDefaultDisplay().getRotation();
+        //noinspection ConstantConditions
+        mSensorOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
+        boolean swappedDimensions = false;
+        switch (displayRotation) {
+            case Surface.ROTATION_0:
+            case Surface.ROTATION_180:
+                if (mSensorOrientation == 90 || mSensorOrientation == 270) {
+                    swappedDimensions = true;
+                }
+                break;
+            case Surface.ROTATION_90:
+            case Surface.ROTATION_270:
+                if (mSensorOrientation == 0 || mSensorOrientation == 180) {
+                    swappedDimensions = true;
+                }
+                break;
+            default:
+                Log.e(TAG, "Display rotation is invalid: " + displayRotation);
+        }
+        return swappedDimensions;
+    }
+
+    /**
+     * Obtains configuration map to be applied to the preview surface
+     *
+     * @param characteristics Camera characteristics
+     * @return the configuration map for the {@link AutoFitTextureView}
+     */
+    @Nullable
+    private static StreamConfigurationMap getStreamConfigurationMap(CameraCharacteristics characteristics) {
+        // We don't use a back facing camera.
+        Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);
+
+        // If facing is null, return
+        if (facing == null) return null;
+        if (facing == CameraMetadata.LENS_FACING_BACK) return null;
+
+        return characteristics.get(
+                CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
+    }
+
+    /**
+     * Obtains optimal preview size to be shown in {@link AutoFitTextureView}
+     *
+     * @param width             Current {@link AutoFitTextureView} width
+     * @param height            Current {@link AutoFitTextureView} height
+     * @param swappedDimensions Whether the preview surface is rotate in relation to the previwe
+     * @param map               Configuration map to be applies to the preview surface
+     * @param largest           Largest display (i.e. image) {@link Size} supported by the preview.
+     */
+    private void getOptimalPreviewSize(int width, int height, boolean swappedDimensions, StreamConfigurationMap map, Size largest) {
+        Point displaySize = new Point();
+        mActivity.getWindowManager().getDefaultDisplay().getSize(displaySize);
+        int rotatedPreviewWidth = width;
+        int rotatedPreviewHeight = height;
+        int maxPreviewWidth = displaySize.x;
+        int maxPreviewHeight = displaySize.y;
+
+        if (swappedDimensions) {
+            rotatedPreviewWidth = height;
+            rotatedPreviewHeight = width;
+            maxPreviewWidth = displaySize.y;
+            maxPreviewHeight = displaySize.x;
+        }
+
+        if (maxPreviewWidth > MAX_PREVIEW_WIDTH) {
+            maxPreviewWidth = MAX_PREVIEW_WIDTH;
+        }
+
+        if (maxPreviewHeight > MAX_PREVIEW_HEIGHT) {
+            maxPreviewHeight = MAX_PREVIEW_HEIGHT;
+        }
+
+        // Danger, W.R.! Attempting to use too large a preview size could  exceed the camera
+        // bus' bandwidth limitation, resulting in gorgeous previews but the storage of
+        // garbage capture data.
+        mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),
+                rotatedPreviewWidth, rotatedPreviewHeight, maxPreviewWidth,
+                maxPreviewHeight, largest);
+    }
+
+    /**
+     * Set image reader listeners
+     *
+     * @param largest Largest display (i.e. image) {@link Size} supported by the preview.
+     */
+    private void setImageReaderListeners(Size largest) {
+        mImageReader = ImageReader.newInstance(largest.getWidth(), largest.getHeight(),
+                ImageFormat.JPEG, /*maxImages*/2);
+        mImageReader.setOnImageAvailableListener(
+                mOnImageAvailableListener, mBackgroundHandler);
+    }
+
+    /**
+     * Sets the preview surface aspect ratio considering the screen orientation/
+     */
+    private void setPreviewAspectRatio() {
+        // We fit the aspect ratio of TextureView to the size of preview we picked.
+        int orientation = mActivity.getResources().getConfiguration().orientation;
+        if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            mTextureView.setAspectRatio(
+                    mPreviewSize.getWidth(), mPreviewSize.getHeight());
+        } else {
+            mTextureView.setAspectRatio(
+                    mPreviewSize.getHeight(), mPreviewSize.getWidth());
+        }
+    }
+
+    /**
+     * Opens the camera specified by {@link SegpassCamera#mCameraId}.
+     */
+    private void openCamera(int width, int height) {
+        // Check permissions
+        if (ContextCompat.checkSelfPermission(mActivity, Manifest.permission.CAMERA)
+                != PackageManager.PERMISSION_GRANTED) {
+            mPermissionListener.onPermissionRequest();
+            return;
+        }
+        setUpCameraOutputs(width, height);
+        configureTransform(width, height);
+        CameraManager manager = (CameraManager) mActivity.getSystemService(Context.CAMERA_SERVICE);
+        try {
+            if (!mCameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
+                throw new SegpassCameraException(ERROR_MSG_CAMERA_TIMEOUT);
+            }
+            manager.openCamera(mCameraId, mStateCallback, mBackgroundHandler);
+        } catch (CameraAccessException e) {
+            Log.e(TAG, "CameraAccessException@openCamera(): " + e.getMessage());
+            mCameraCallback.onCameraInitError(ERROR_MSG_CAMERA_ACCESS);
+        } catch (InterruptedException e) {
+            Log.e(TAG, "InterruptedException@openCamera(): " + e.getMessage());
+            mCameraCallback.onCameraInitError(ERROR_MSG_CAMERA_RUNTIME);
+            mBackgroundThread.interrupt();
+        }
+    }
+
+    /**
+     * Closes the current {@link CameraDevice}.
+     */
+    private void closeCamera() {
+        try {
+            mCameraOpenCloseLock.acquire();
+            if (null != mCaptureSession) {
+                mCaptureSession.close();
+                mCaptureSession = null;
+            }
+            if (null != mCameraDevice) {
+                mCameraDevice.close();
+                mCameraDevice = null;
+            }
+            if (null != mImageReader) {
+                mImageReader.close();
+                mImageReader = null;
+            }
+        } catch (InterruptedException e) {
+            mBackgroundThread.interrupt();
+            Log.e(TAG, "InterruptedException@closeCamera(): " + e.getMessage());
+        } finally {
+            mCameraOpenCloseLock.release();
+        }
+    }
+
+    /**
+     * Creates a new {@link CameraCaptureSession} for camera preview.
+     */
+    private void createCameraPreviewSession() {
+        try {
+            SurfaceTexture texture = mTextureView.getSurfaceTexture();
+            assert texture != null;
+
+            // We configure the size of default buffer to be the size of camera preview we want.
+            texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
+
+            // This is the output Surface we need to start preview.
+            Surface surface = new Surface(texture);
+
+            // We set up a CaptureRequest.Builder with the output Surface.
+            mPreviewRequestBuilder
+                    = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
+            mPreviewRequestBuilder.addTarget(surface);
+
+            // Here, we create a CameraCaptureSession for camera preview.
+            mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),
+                    new CameraCaptureSession.StateCallback() {
+
+                        @Override
+                        public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
+                            // The camera is already closed
+                            if (null == mCameraDevice) {
+                                return;
+                            }
+
+                            // When the session is ready, we start displaying the preview.
+                            mCaptureSession = cameraCaptureSession;
+                            try {
+                                // Finally, we start displaying the camera preview.
+                                mPreviewRequest = mPreviewRequestBuilder.build();
+                                mCaptureSession.setRepeatingRequest(mPreviewRequest,
+                                        null, mBackgroundHandler);
+                            } catch (CameraAccessException e) {
+                                Log.e(TAG, "onConfigured(): " + e.getMessage());
+                                mCameraCallback.onCameraInitError(ERROR_MSG_CAMERA_ACCESS);
+                            }
+                        }
+
+                        @Override
+                        public void onConfigureFailed(
+                                @NonNull CameraCaptureSession cameraCaptureSession) {
+                            mCameraCallback.onCameraInitError(ERROR_MSG_CAMERA_CONFIG_FAILED);
+                        }
+                    }, null
+            );
+        } catch (CameraAccessException e) {
+            Log.e(TAG, "createCameraPreviewSession(): " + e.getMessage());
+            mCameraCallback.onCameraInitError(ERROR_MSG_CAMERA_ACCESS);
+        }
+    }
+
+    /**
+     * Configures the necessary {@link android.graphics.Matrix} transformation to `mTextureView`.
+     * This method should be called after the camera preview size is determined in
+     * setUpCameraOutputs and also the size of `mTextureView` is fixed.
+     *
+     * @param viewWidth  The width of `mTextureView`
+     * @param viewHeight The height of `mTextureView`
+     */
+    private void configureTransform(int viewWidth, int viewHeight) {
+        if (null == mTextureView || null == mPreviewSize) {
+            return;
+        }
+        int rotation = mActivity.getWindowManager().getDefaultDisplay().getRotation();
+        Matrix matrix = new Matrix();
+        RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
+        RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());
+        float centerX = viewRect.centerX();
+        float centerY = viewRect.centerY();
+        if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
+            bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
+            matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
+            float scale = Math.max(
+                    (float) viewHeight / mPreviewSize.getHeight(),
+                    (float) viewWidth / mPreviewSize.getWidth());
+            matrix.postScale(scale, scale, centerX, centerY);
+            matrix.postRotate(90f * (rotation - 2), centerX, centerY);
+        } else if (Surface.ROTATION_180 == rotation) {
+            matrix.postRotate(180, centerX, centerY);
+        }
+        mTextureView.setTransform(matrix);
+    }
+
+    /**
+     * Initiate a still image capture.
+     */
+    public void takePicture() {
+
+        // Validate that the camera is available
+        if (mCameraDevice == null) {
+            Log.e(TAG, "cameraDevice is null");
+            return;
+        }
+        try {
+            // Get camera manager and characteristics
+            CameraManager manager = (CameraManager) mActivity.getSystemService(Context.CAMERA_SERVICE);
+            CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraId);
+
+            // Obtains list of image size supported by the selected camera sensor.
+            Size[] jpegSizes = Objects.requireNonNull(characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)).getOutputSizes(ImageFormat.JPEG);
+            if (jpegSizes == null) throw new NullPointerException(ERROR_MSG_NO_CAMERA_PREVIEW_SIZE);
+
+            // Default dimensions
+            int width = 640;
+            int height = 480;
+
+            if (jpegSizes.length > 0) {
+                width = jpegSizes[0].getWidth();
+                height = jpegSizes[0].getHeight();
+            }
+
+            // Set a new instance of ImageReader
+            ImageReader mCaptureImageReader = getCaptureImageReader(width, height);
+
+            // Set the output surfaces (from where the picture is taken)
+            List<Surface> outputSurfaces = new ArrayList<>(2);
+            outputSurfaces.add(mCaptureImageReader.getSurface());
+            outputSurfaces.add(new Surface(mTextureView.getSurfaceTexture()));
+
+            // Create the CaptiureBuilder
+            final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
+            captureBuilder.addTarget(mCaptureImageReader.getSurface());
+            captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
+
+            // Picture orientation
+            int rotation = mActivity.getWindowManager().getDefaultDisplay().getRotation();
+            captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, getOrientation(rotation));
+
+            // Listens when the image is finally taken.
+            mCaptureImageReader.setOnImageAvailableListener(mOnImageAvailableListener, mBackgroundHandler);
+            final CameraCaptureSession.CaptureCallback captureListener = new CameraCaptureSession.CaptureCallback() {
+                @Override
+                public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
+                    super.onCaptureCompleted(session, request, result);
+                    // No code needed here, events are handled separately.
+                }
+            };
+
+            // Initialized the session to listen to a picture capture event.
+            mCameraDevice.createCaptureSession(outputSurfaces, new CameraCaptureSession.StateCallback() {
+                @Override
+                public void onConfigured(@NonNull CameraCaptureSession session) {
+                    try {
+                        session.capture(captureBuilder.build(), captureListener, mBackgroundHandler);
+                    } catch (CameraAccessException e) {
+                        Log.e(TAG, "onConfigured@takePicture(): " + e.getMessage());
+                        mCameraCallback.onCameraInitError(ERROR_MSG_CAMERA_ACCESS);
+                    }
+                }
+
+                @Override
+                public void onConfigureFailed(@NonNull CameraCaptureSession session) {
+                    // No implementation needed here.
+                }
+            }, mBackgroundHandler);
+        } catch (CameraAccessException e) {
+            Log.e(TAG, "CameraAccessException@takePicture(): " + e.getMessage());
+            mCameraCallback.onCameraInitError(ERROR_MSG_CAMERA_ACCESS);
+        }
+
+    }
+
+    public void savePicture() {
+        // Save the picture. Delegate later actions to the host application.
+        mBackgroundHandler.post(new ImageSaverUtil(mImage, base64Callback));
+    }
+
+    public void discardPicture() {
+        // Discard taken picture, resume camera preview session
+        mImage = null;
+        createCameraPreviewSession();
+    }
+
+    /**
+     * Gets the ImageReader for capturing a still picture.
+     *
+     * @param width  Supported image width by surface and sensor.
+     * @param height Supported image height by surface and sensor.
+     * @return {@link ImageReader} object for the preview surface.
+     */
+    @NonNull
+    private static ImageReader getCaptureImageReader(int width, int height) {
+        return ImageReader.newInstance(width, height, ImageFormat.JPEG, 1);
+    }
+
+    /**
+     * Obtains orientation that will be applied to the captured image.
+     *
+     * @param rotation Rotation angle.
+     * @return Orientation value.
+     */
+    private int getOrientation(int rotation) {
+        // Sensor orientation is 90 for most devices, or 270 for some devices (eg. Nexus 5X)
+        // We have to take that into account and rotate JPEG properly.
+        // For devices with orientation of 90, we simply return our mapping from ORIENTATIONS.
+        // For devices with orientation of 270, we need to rotate the JPEG 180 degrees.
+        return (ORIENTATIONS.get(rotation) + mSensorOrientation + 270) % 360;
+    }
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/dialogs/SegpassConfirmationDialogFragment.java

@@ -0,0 +1,40 @@
+package com.example.cameraxtestappjava.segpass.camera.dialogs;
+
+import android.app.Dialog;
+import android.os.Bundle;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.DialogFragment;
+
+import com.example.cameraxtestappjava.segpass.camera.interfaces.SegpassDialogListener;
+
+public class SegpassConfirmationDialogFragment extends DialogFragment {
+
+    private final SegpassDialogListener listener;
+    private final String message;
+
+    public SegpassConfirmationDialogFragment(String message, SegpassDialogListener listener) {
+        this.listener = listener;
+        this.message = message;
+    }
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        return new AlertDialog.Builder(requireActivity())
+                .setMessage(message)
+                .setPositiveButton(android.R.string.ok, (dialog, which) -> {
+                    if (listener != null) {
+                        listener.onOkClicked();
+                    }
+                })
+                .setNegativeButton(android.R.string.cancel, (dialog, which) -> {
+                    if (listener != null) {
+                        listener.onCancelClicked();
+                    }
+                    dismiss(); // Dismiss the dialog
+                })
+                .create();
+    }
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/dialogs/SegpassErrorDialogFragment.java

@@ -0,0 +1,38 @@
+package com.example.cameraxtestappjava.segpass.camera.dialogs;
+
+import android.app.Activity;
+import android.app.Dialog;
+import android.os.Bundle;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.DialogFragment;
+
+import com.example.cameraxtestappjava.segpass.camera.utils.SegpassErrorDialogListener;
+
+public class SegpassErrorDialogFragment extends DialogFragment {
+
+    private final String message;
+    private final SegpassErrorDialogListener listener;
+
+    public SegpassErrorDialogFragment(String message, SegpassErrorDialogListener listener) {
+        this.message = message;
+        this.listener = listener;
+    }
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final Activity activity = getActivity();
+        assert activity != null;
+        return new AlertDialog.Builder(activity)
+                .setMessage(message)
+                .setPositiveButton(android.R.string.ok, (dialogInterface, i) -> {
+                    if (listener != null) {
+                        listener.onErrorOkClick(); // Call listener if available
+                    }
+                    dismiss(); // Dismiss the dialog
+                })
+                .create();
+    }
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/exceptions/SegpassCameraException.java

@@ -0,0 +1,12 @@
+package com.example.cameraxtestappjava.segpass.camera.exceptions;
+
+public class SegpassCameraException extends RuntimeException {
+
+    public SegpassCameraException(String message) {
+        super(message);
+    }
+
+    public SegpassCameraException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/interfaces/SegpassDialogListener.java

@@ -0,0 +1,6 @@
+package com.example.cameraxtestappjava.segpass.camera.interfaces;
+
+public interface SegpassDialogListener {
+    void onOkClicked();
+    void onCancelClicked();
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/utils/CompareSizesByArea.java

@@ -0,0 +1,19 @@
+package com.example.cameraxtestappjava.segpass.camera.utils;
+
+import android.util.Size;
+
+import java.util.Comparator;
+
+/**
+ * Compares two {@code Size}s based on their areas.
+ */
+public class CompareSizesByArea implements Comparator<Size> {
+
+    @Override
+    public int compare(Size lhs, Size rhs) {
+        // We cast here to ensure the multiplications won't overflow
+        return Long.signum((long) lhs.getWidth() * lhs.getHeight() -
+                (long) rhs.getWidth() * rhs.getHeight());
+    }
+
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/utils/ImageEncodingCallback.java

@@ -0,0 +1,8 @@
+package com.example.cameraxtestappjava.segpass.camera.utils;
+
+public interface ImageEncodingCallback {
+    void onImageEncodeSuccess(String base64);
+
+    void onImageEncodeFail(String error);
+
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/utils/ImageSaverUtil.java

@@ -0,0 +1,69 @@
+package com.example.cameraxtestappjava.segpass.camera.utils;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.media.Image;
+import android.util.Base64;
+import android.util.Log;
+
+import java.io.ByteArrayOutputStream;
+import java.nio.ByteBuffer;
+
+public class ImageSaverUtil implements Runnable {
+
+    /**
+     * Tag for the {@link Log}
+     */
+    private static final String TAG = "ImageSaverUtil";
+
+    /**
+     * The JPEG image
+     */
+    private final Image mImage;
+
+    /**
+     * Callback to return encoded image value in {@link Base64}
+     */
+    private final ImageEncodingCallback mCallback;
+
+    public ImageSaverUtil(Image image, ImageEncodingCallback callback) {
+        mImage = image;
+        mCallback = callback;
+    }
+
+    @Override
+    public void run() {
+        try {
+
+            // Get image as byte data buffer
+            ByteBuffer buffer = mImage.getPlanes()[0].getBuffer();
+            byte[] bytes = new byte[buffer.capacity()];
+            buffer.get(bytes);
+
+            // Convert byte data to a Bitmap
+            Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
+
+            // Create a ByteArrayOutputStream to capture the compressed image data
+            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+
+            // Compress the bitmap with JPEG format and desired quality (25% will do for this use case)
+            bitmap.compress(Bitmap.CompressFormat.JPEG, 25, outputStream);
+
+            // Get the compressed image data as a byte array
+            byte[] compressedImageData = outputStream.toByteArray();
+
+            // Encode the compressed data to Base64 string
+            String base64String = Base64.encodeToString(compressedImageData, Base64.NO_WRAP);
+
+            // Close the stream (optional, as ByteArrayOutputStream should close automatically)
+            outputStream.close();
+
+            // Return Base64 string on callback
+            mCallback.onImageEncodeSuccess(base64String);
+
+        } catch (Exception e) {
+            Log.e(TAG, "Error encoding photo: " + e.getMessage());
+            mCallback.onImageEncodeFail(e.getMessage());
+        }
+    }
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/utils/SegpassCameraCallback.java

@@ -0,0 +1,9 @@
+package com.example.cameraxtestappjava.segpass.camera.utils;
+
+public interface SegpassCameraCallback {
+
+    void onPictureTakenSuccess(String base64);
+    void onPictureTakenFail(String error);
+    void onCameraInitError(String errorMessage);
+
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/utils/SegpassErrorDialogListener.java

@@ -0,0 +1,5 @@
+package com.example.cameraxtestappjava.segpass.camera.utils;
+
+public interface SegpassErrorDialogListener {
+    void onErrorOkClick();
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/utils/SegpassPermissionCallback.java

@@ -0,0 +1,7 @@
+package com.example.cameraxtestappjava.segpass.camera.utils;
+
+public interface SegpassPermissionCallback {
+    void onPermissionRequest();
+    void onPermissionGranted();
+    void onPermissionDenied();
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/view/AutoFitTextureView.java

@@ -0,0 +1,57 @@
+package com.example.cameraxtestappjava.segpass.camera.view;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.TextureView;
+
+public class AutoFitTextureView extends TextureView {
+
+    private int mRatioWidth = 0;
+    private int mRatioHeight = 0;
+
+    public AutoFitTextureView(Context context) {
+        this(context, null);
+    }
+
+    public AutoFitTextureView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public AutoFitTextureView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    /**
+     * Sets the aspect ratio for this view. The size of the view will be measured based on the ratio
+     * calculated from the parameters. Note that the actual sizes of parameters don't matter, that
+     * is, calling setAspectRatio(2, 3) and setAspectRatio(4, 6) make the same result.
+     *
+     * @param width  Relative horizontal size
+     * @param height Relative vertical size
+     */
+    public void setAspectRatio(int width, int height) {
+        if (width < 0 || height < 0) {
+            throw new IllegalArgumentException("Size cannot be negative.");
+        }
+        mRatioWidth = width;
+        mRatioHeight = height;
+        requestLayout();
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        int width = MeasureSpec.getSize(widthMeasureSpec);
+        int height = MeasureSpec.getSize(heightMeasureSpec);
+        if (0 == mRatioWidth || 0 == mRatioHeight) {
+            setMeasuredDimension(width, height);
+        } else {
+            if (width < height * mRatioWidth / mRatioHeight) {
+                setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
+            } else {
+                setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
+            }
+        }
+    }
+
+}

app/src/main/java/com/example/cameraxtestappjava/segpass/camera/view/SegpassCameraLayout.java

@@ -0,0 +1,139 @@
+package com.example.cameraxtestappjava.segpass.camera.view;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.ImageButton;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.example.cameraxtestappjava.R;
+import com.example.cameraxtestappjava.segpass.SegpassCamera;
+import com.example.cameraxtestappjava.segpass.camera.utils.SegpassCameraCallback;
+import com.example.cameraxtestappjava.segpass.camera.utils.SegpassPermissionCallback;
+
+public class SegpassCameraLayout extends FrameLayout {
+
+    /**
+     * Parent {@link AppCompatActivity} where the SegpassCameraLayout is instantiated from.
+     */
+    private AppCompatActivity mActivity;
+
+    /**
+     * Callback for camera permissions
+     */
+    private SegpassPermissionCallback mPermissionListener;
+
+    /**
+     * Callback dealing with camera state and results.
+     */
+    private SegpassCameraCallback mCameraCallback;
+
+    /**
+     * SegpassCamera
+     */
+    private SegpassCamera mCamera;
+
+    /**
+     * SegpassCameraLayout root view.
+     */
+    private final View rootView;
+
+    /**
+     *
+     */
+
+    private ImageButton mTakePicture;
+    private ImageButton mDiscardPicture;
+    private ImageButton mSavePicture;
+
+    public SegpassCameraLayout(@NonNull Context context) {
+        super(context);
+        rootView = inflate(context, R.layout.segpass_camera_layout, this);
+    }
+
+    public SegpassCameraLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+        rootView = inflate(context, R.layout.segpass_camera_layout, this);
+    }
+
+    /**
+     * @param activity       Parent activity where the camera is called from.
+     * @param listener       {@link SegpassPermissionCallback} that deals with camera and storage permissions.
+     * @param cameraCallback {@link SegpassCameraCallback} that deals with operation results.
+     */
+    public void init(AppCompatActivity activity, SegpassPermissionCallback listener, SegpassCameraCallback cameraCallback) {
+        mActivity = activity;
+        mPermissionListener = listener;
+        mCameraCallback = cameraCallback;
+        setUpCamera();
+        setUpViews();
+        setUpListeners();
+    }
+
+    /**
+     * Set up {@link AutoFitTextureView} and {@link SegpassCamera}
+     */
+    private void setUpCamera() {
+        AutoFitTextureView mTextureView = rootView.findViewById(R.id.tvCameraTextureView);
+        mCamera = new SegpassCamera(mActivity, mTextureView, mPermissionListener, mCameraCallback);
+        mCamera.resumeCamera();
+    }
+
+    private void setUpViews() {
+        mTakePicture = rootView.findViewById(R.id.btnTakePhoto);
+        mDiscardPicture = rootView.findViewById(R.id.btnDiscardPicture);
+        mSavePicture = rootView.findViewById(R.id.btnSavePicture);
+    }
+
+    private void setUpListeners() {
+        mTakePicture.setOnClickListener(v -> {
+            showPictureButtons();
+            hideShutterButton();
+            mCamera.takePicture();
+        });
+        mDiscardPicture.setOnClickListener(v -> {
+            showShutterButton();
+            hidePictureButtons();
+            mCamera.discardPicture();
+        });
+        mSavePicture.setOnClickListener(v -> {
+            showShutterButton();
+            hidePictureButtons();
+            mCamera.savePicture();
+        });
+    }
+
+    public void resumeCamera() {
+        mCamera.resumeCamera();
+    }
+
+    public void pauseCamera() {
+        mCamera.pauseCamera();
+    }
+
+    public void showToast(String message) {
+        mCamera.showToast(message);
+    }
+
+    private void showShutterButton() {
+        mTakePicture.setVisibility(View.VISIBLE);
+    }
+
+    private void hideShutterButton() {
+        mTakePicture.setVisibility(View.GONE);
+    }
+
+    private void showPictureButtons() {
+        mSavePicture.setVisibility(View.VISIBLE);
+        mDiscardPicture.setVisibility(View.VISIBLE);
+    }
+
+    private void hidePictureButtons() {
+        mSavePicture.setVisibility(View.GONE);
+        mDiscardPicture.setVisibility(View.GONE);
+    }
+}

app/src/main/res/drawable/ic_check.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="32dp"
+    android:height="32dp"
+    android:viewportWidth="20"
+    android:viewportHeight="20">
+
+    <path
+        android:fillColor="#00FFFFFF"
+        android:pathData="M17,5L8,15l-5,-4"
+        android:strokeWidth="2"
+        android:strokeColor="#FFFFFF"
+        android:strokeLineCap="round"
+        android:strokeLineJoin="round" />
+
+</vector>

app/src/main/res/drawable/ic_close.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="32dp"
+    android:height="32dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+
+    <path
+        android:fillColor="#00FFFFFF"
+        android:pathData="M18,18L12,12M12,12L6,6M12,12L18,6M12,12L6,18"
+        android:strokeWidth="2"
+        android:strokeColor="#FFFFFF"
+        android:strokeLineCap="round"
+        android:strokeLineJoin="round" />
+
+</vector>

app/src/main/res/layout/activity_camera.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".CameraActivityOld">
+
+    <include
+        android:id="@+id/inCamera2"
+        layout="@layout/segpass_camera_layout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_camera2.xml

@@ -7,10 +7,4 @@
     android:layout_height="match_parent"
     tools:context=".Camera2Activity">
 
-    <include
-        android:id="@+id/c2Camera"
-        layout="@layout/custom_camera2_view"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent" />
-
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_camera_new.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".CameraActivityNew">
+
+    <include
+        android:id="@+id/inCamera2"
+        layout="@layout/segpass_camera_layout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</FrameLayout>

app/src/main/res/layout/activity_main.xml

@@ -7,46 +7,14 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <include
-        android:id="@+id/c2Camera"
-        layout="@layout/custom_camera2_view"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent" />
-
-    <include
-        android:visibility="gone"
-        android:id="@+id/cvCustomCamera"
-        layout="@layout/custom_camera_view"
-        android:layout_height="match_parent"
-        android:layout_width="match_parent" />
-
-    <!--<androidx.camera.view.PreviewView
-        android:id="@+id/pvViewfinder"
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        app:layout_constraintBottom_toTopOf="@id/llCameraButtons"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
-
-    <LinearLayout
-        android:id="@+id/llCameraButtons"
-        android:layout_width="match_parent"
+    <Button
+        android:id="@+id/goToCamera"
+        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:gravity="center"
-        android:orientation="horizontal"
+        app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/pvViewfinder">
-
-
-        <androidx.appcompat.widget.AppCompatButton
-            android:id="@+id/btnTakePicture"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:text="Take Picture" />
-
-    </LinearLayout>-->
+        app:layout_constraintEnd_toEndOf="parent"
+        android:text="OPEN CAMERA" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_segpass_camera.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".SegpassCameraActivity">
+
+    <com.example.cameraxtestappjava.segpass.camera.view.SegpassCameraLayout
+        android:id="@+id/sclCameraLayout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/custom_camera2_view.xml

@@ -10,59 +10,12 @@
     <TextureView
         android:id="@+id/tvCameraTextureView"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_above="@+id/btn_takepicture"
+        android:layout_height="match_parent"
+        android:layout_above="@id/btnTakePhoto"
         android:layout_alignParentTop="true" />
 
-    <RelativeLayout
-        android:id="@+id/rl1"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_alignParentTop="true"
-        android:background="#66000000"
-        android:minHeight="200px">
-
-        <TextView
-            android:id="@+id/tv2"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_alignParentTop="true"
-            android:text="Camera Ids:"
-            android:textColor="#ffffff" />
-    </RelativeLayout>
-
     <ImageButton
-        android:id="@+id/sw_lens"
-        android:layout_width="50dip"
-        android:layout_height="50dip"
-        android:layout_above="@+id/rl2"
-        android:layout_centerHorizontal="true"
-        android:background="?android:selectableItemBackground"
-        android:contentDescription="switch_lens"
-        android:padding="10dip"
-        android:scaleType="fitCenter"
-        android:src="@drawable/capture_button_video"
-        android:text="1X" />
-
-    <RelativeLayout
-        android:id="@+id/rl2"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_alignParentBottom="true"
-        android:background="#66000000"
-        android:minHeight="500px">
-
-        <TextView
-            android:id="@+id/tv"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_alignParentTop="true"
-            android:text="Camera Ids:"
-            android:textColor="#ffffff" />
-    </RelativeLayout>
-
-    <ImageButton
-        android:id="@+id/btn_takepicture"
+        android:id="@+id/btnTakePhoto"
         android:layout_width="80dip"
         android:layout_height="80dip"
         android:layout_alignParentBottom="true"
@@ -71,6 +24,6 @@
         android:contentDescription="take_photo"
         android:padding="10dip"
         android:scaleType="fitCenter"
-        android:src="@drawable/capture_button_video" />
+        android:src="@drawable/capture_picture_button" />
 </RelativeLayout>
 

app/src/main/res/layout/segpass_camera_layout.xml

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#000000"
+    android:orientation="vertical">
+
+    <com.example.cameraxtestappjava.segpass.camera.view.AutoFitTextureView
+        android:id="@+id/tvCameraTextureView"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <ImageButton
+        android:id="@+id/btnTakePhoto"
+        android:layout_width="80dip"
+        android:layout_height="80dip"
+        android:layout_gravity="bottom|center"
+        android:background="?android:selectableItemBackground"
+        android:padding="10dp"
+        android:scaleType="fitCenter"
+        android:src="@drawable/capture_picture_button" />
+
+    <ImageButton
+        android:id="@+id/btnDiscardPicture"
+        android:layout_width="72dip"
+        android:layout_height="72dip"
+        android:layout_gravity="bottom|start"
+        android:background="?android:selectableItemBackground"
+        android:padding="15dp"
+        android:scaleType="fitCenter"
+        android:src="@drawable/ic_close"
+        android:visibility="gone" />
+
+    <ImageButton
+        android:id="@+id/btnSavePicture"
+        android:layout_width="72dip"
+        android:layout_height="72dip"
+        android:layout_gravity="bottom|end"
+        android:background="?android:selectableItemBackground"
+        android:padding="15dp"
+        android:scaleType="fitCenter"
+        android:src="@drawable/ic_check"
+        android:visibility="gone" />
+</FrameLayout>
+

gradle/libs.versions.toml

@@ -8,6 +8,7 @@ material = "1.12.0"
 activity = "1.8.0"
 constraintlayout = "2.1.4"
 camerax = "1.3.3"
+robolectric = "4.8.1"
 
 [libraries]
 junit = { group = "junit", name = "junit", version.ref = "junit" }
@@ -22,6 +23,7 @@ camera-camera2 = { group = "androidx.camera", name = "camera-camera2", version.r
 camera-lifecycle = { group = "androidx.camera", name = "camera-lifecycle", version.ref = "camerax"}
 camera-view = { group = "androidx.camera", name = "camera-view", version.ref = "camerax"}
 camera-extensions = { group = "androidx.camera", name = "camera-extensions", version.ref = "camerax"}
+robolectric = { module = "org.robolectric:robolectric", version.ref = "robolectric" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }