Fixes to navbar for devices under Android O

app/src/main/res/values-night-v29/themes.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Tachiyomi" parent="Theme.Base">
+        <item name="android:statusBarColor">@android:color/transparent</item>
+        <item name="android:navigationBarColor">@android:color/transparent</item>
+    </style>
+</resources>

app/src/main/res/values-night/themes.xml

@@ -31,6 +31,7 @@
     <item name="text_color_primary">@color/textColorPrimaryDark</item>
     <item name="background_card">@color/cardBackground</item>
     <item name="icon_color">@color/iconColorDark</item>
+    <item name="android:navigationBarColor">@color/oldNavBarBackground</item>
   </style>
 
   <style name="Theme.Base.Reader" parent="Theme.Base">

app/src/main/res/values-v26/themes.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Tachiyomi" parent="Theme.Base">
+        <item name="android:navigationBarColor">@color/oldNavBarBackground</item>
+    </style>
+</resources>

app/src/main/res/values/themes.xml

@@ -40,7 +40,7 @@
         <item name="icon_color">@color/iconColorLight</item>
 
         <item name="android:statusBarColor">@android:color/transparent</item>
-        <item name="android:navigationBarColor">@color/oldNavBarBackground</item>
+        <item name="android:navigationBarColor">@color/colorPrimary</item>
     </style>
 
     <style name="Theme.Tachiyomi" parent="Theme.Base"/>