Add a black background setting for the reader

app/src/main/java/eu/kanade/mangafeed/data/preference/PreferencesHelper.java

@@ -83,6 +83,10 @@ public class PreferencesHelper {
         return rxPrefs.getFloat(getKey(R.string.pref_custom_brightness_value_key), 0F);
     }
 
+    public int getReaderTheme() {
+        return prefs.getInt(getKey(R.string.pref_reader_theme_key), 0);
+    }
+
     public int getDefaultViewer() {
         return Integer.parseInt(prefs.getString(getKey(R.string.pref_default_viewer_key), "1"));
     }

app/src/main/java/eu/kanade/mangafeed/ui/reader/ReaderActivity.java

@@ -3,9 +3,11 @@ package eu.kanade.mangafeed.ui.reader;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ActivityInfo;
+import android.graphics.Color;
 import android.os.Build;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
+import android.support.v4.content.ContextCompat;
 import android.support.v7.widget.Toolbar;
 import android.view.Surface;
 import android.view.View;
@@ -51,6 +53,7 @@ public class ReaderActivity extends BaseRxActivity<ReaderPresenter> {
     private ReaderMenu readerMenu;
 
     private int uiFlags;
+    private int readerTheme;
     protected CompositeSubscription subscriptions;
     private Subscription customBrightnessSubscription;
 
@@ -59,6 +62,8 @@ public class ReaderActivity extends BaseRxActivity<ReaderPresenter> {
     private static final int VERTICAL = 3;
     private static final int WEBTOON = 4;
 
+    public static final int BLACK_THEME = 1;
+
     public static Intent newIntent(Context context) {
         return new Intent(context, ReaderActivity.class);
     }
@@ -78,6 +83,10 @@ public class ReaderActivity extends BaseRxActivity<ReaderPresenter> {
         if (savedState != null && readerMenu.showing)
             readerMenu.show(false);
 
+        readerTheme = preferences.getReaderTheme();
+        if (readerTheme == BLACK_THEME)
+            setBlackTheme();
+
         initializeSettings();
     }
 
@@ -251,6 +260,16 @@ public class ReaderActivity extends BaseRxActivity<ReaderPresenter> {
         recreate();
     }
 
+    private void setBlackTheme() {
+        getWindow().getDecorView().getRootView().setBackgroundColor(Color.BLACK);
+        pageNumber.setTextColor(ContextCompat.getColor(this, R.color.light_grey));
+        pageNumber.setBackgroundColor(ContextCompat.getColor(this, R.color.page_number_background_black));
+    }
+
+    public int getReaderTheme() {
+        return readerTheme;
+    }
+
     public ViewGroup getContainer() {
         return container;
     }

app/src/main/java/eu/kanade/mangafeed/ui/reader/viewer/common/ViewPagerReaderFragment.java

@@ -2,6 +2,7 @@ package eu.kanade.mangafeed.ui.reader.viewer.common;
 
 import android.os.Bundle;
 import android.support.annotation.Nullable;
+import android.support.v4.content.ContextCompat;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
@@ -37,6 +38,7 @@ public class ViewPagerReaderFragment extends BaseFragment {
     @Bind(R.id.progress_text) TextView progressText;
     @Bind(R.id.retry_button) Button retryButton;
 
+    private ReaderActivity activity;
     private Page page;
     private Subscription progressSubscription;
     private Subscription statusSubscription;
@@ -51,17 +53,22 @@ public class ViewPagerReaderFragment extends BaseFragment {
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
         View view = inflater.inflate(R.layout.fragment_page, container, false);
         ButterKnife.bind(this, view);
+        activity = (ReaderActivity) getActivity();
+
+        if (activity.getReaderTheme() == ReaderActivity.BLACK_THEME) {
+             progressText.setTextColor(ContextCompat.getColor(getContext(), R.color.light_grey));
+        }
 
         imageView.setDoubleTapZoomStyle(SubsamplingScaleImageView.ZOOM_FOCUS_FIXED);
         imageView.setPanLimit(SubsamplingScaleImageView.PAN_LIMIT_INSIDE);
         imageView.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CENTER_INSIDE);
         imageView.setOnTouchListener((v, motionEvent) ->
-                ((ReaderActivity) getActivity()).getViewer().onImageTouch(motionEvent));
+                activity.getViewer().onImageTouch(motionEvent));
 
         retryButton.setOnTouchListener((v, event) -> {
             if (event.getAction() == MotionEvent.ACTION_UP) {
                 if (page != null)
-                    ((ReaderActivity) getActivity()).getPresenter().retryPage(page);
+                    activity.getPresenter().retryPage(page);
                 return true;
             }
             return true;

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

@@ -39,4 +39,15 @@
         <item>75</item>
         <item>100</item>
     </string-array>
+
+    <string-array name="reader_themes">
+        <item>@string/white_theme</item>
+        <item>@string/black_theme</item>
+    </string-array>
+
+    <string-array name="reader_themes_values">
+        <item>0</item>
+        <item>1</item>
+    </string-array>
+
 </resources>

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

@@ -28,5 +28,6 @@
     <color name="line_grey">@color/md_light_dividers</color>
     <color name="light_grey">@color/md_grey_300</color>
     <color name="page_number_background">#AAE9E9E9</color>
+    <color name="page_number_background_black">#AA252525</color>
     <color name="reader_menu_background">@color/colorPrimarySuperDark</color>
 </resources>

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

@@ -14,6 +14,7 @@
     <string name="pref_keep_screen_on_key">pref_keep_screen_on_key</string>
     <string name="pref_custom_brightness_key">pref_custom_brightness_key</string>
     <string name="pref_custom_brightness_value_key">pref_custom_brightness_value_key</string>
+    <string name="pref_reader_theme_key">pref_reader_theme_key</string>
 
     <string name="pref_download_directory_key">pref_download_directory_key</string>
     <string name="pref_download_slots_key">pref_download_slots_key</string>

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

@@ -47,6 +47,9 @@
     <string name="pref_enable_transitions">Enable transitions</string>
     <string name="pref_show_page_number">Show page number</string>
     <string name="pref_custom_brightness">Use custom brightness</string>
+    <string name="pref_reader_theme">Reader theme</string>
+    <string name="white_theme">White</string>
+    <string name="black_theme">Black</string>
     <string name="pref_viewer_type">Default viewer</string>
     <string name="default_viewer">Default</string>
     <string name="left_to_right_viewer">Left to right</string>

app/src/main/res/xml/pref_reader.xml

@@ -25,6 +25,15 @@
         android:key="@string/pref_default_viewer_key"
         android:entries="@array/viewers"
         android:entryValues="@array/viewers_values"
-        android:defaultValue="1"/>
+        android:defaultValue="1"
+        android:summary="%s"/>
+
+    <eu.kanade.mangafeed.ui.setting.preference.IntListPreference
+        android:title="@string/pref_reader_theme"
+        android:key="@string/pref_reader_theme_key"
+        android:entries="@array/reader_themes"
+        android:entryValues="@array/reader_themes_values"
+        android:defaultValue="0"
+        android:summary="%s"/>
 
 </PreferenceScreen>