Start working on amoled / true black theme

#32

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

@@ -2,6 +2,8 @@
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
+    android:background="?attr/background"
+
     android:layout_height="match_parent">
 
     <LinearLayout

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

@@ -2,6 +2,7 @@
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
+    android:background="?attr/background"
     android:layout_width="match_parent"
     android:layout_height="wrap_content">
     <LinearLayout
@@ -11,7 +12,7 @@
         android:id="@+id/copy_button"
         android:clickable="true"
         android:focusable="true"
-        android:background="?attr/selectableItemBackground"
+        android:background="?attr/background"
         android:orientation="horizontal">
         <ImageView
             android:layout_width="wrap_content"
@@ -31,7 +32,7 @@
         android:padding="16dp"
         android:clickable="true"
         android:focusable="true"
-        android:background="?attr/selectableItemBackground"
+        android:background="?attr/background"
         android:id="@+id/edit_button"
         android:orientation="horizontal">
         <ImageView
@@ -53,7 +54,7 @@
         android:id="@+id/delete_button"
         android:clickable="true"
         android:focusable="true"
-        android:background="?attr/selectableItemBackground"
+
         android:orientation="horizontal">
         <ImageView
             android:layout_width="wrap_content"

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

@@ -35,6 +35,7 @@
     <color name="hint_text_dark">#a7a7a7</color>
     <color name="secondary_text_dark">#FF5252</color>
     <color name="background_dark">#212121</color>
+    <color name="background_true_dark">#000000</color>
 
     <color name="warning_color">#f4511e</color>
     <color name="hint_color">#42000000</color>

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

@@ -66,6 +66,16 @@
         <item name="swirl_ridgeColor">@color/colorSwirlPrimaryDark</item>
         <item name="swirl_errorColor">@color/colorSwirlErrorDark</item>
     </style>
+
+    <style name="AppTheme.TrueBlack" parent="AppTheme.Dark">
+        <item name="colorPrimary">@color/background_true_dark</item>
+
+        <item name="cardBackground">@color/background_true_dark</item>
+        <item name="background">@color/background_true_dark</item>
+        <item name="bottomSheetDialogTheme">@style/Theme.Design.BottomSheetDialog</item>
+        <item name="preferenceTheme">@style/PreferenceThemeOverlay.v14.Material</item>
+    </style>
+
     <style name="AppTheme.Dark.NoActionBar">
         <item name="windowActionBar">false</item>
         <item name="windowNoTitle">true</item>