Add option to follow system theme

app/src/main/java/de/danoeh/antennapod/preferences/PreferenceUpgrader.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
 import de.danoeh.antennapod.BuildConfig;
+import de.danoeh.antennapod.R;
 import de.danoeh.antennapod.core.preferences.UserPreferences;
 import de.danoeh.antennapod.core.util.gui.NotificationUtils;
 
@@ -64,5 +65,11 @@ public class PreferenceUpgrader {
                     break;
             }
         }
+        if (oldVersion < 1070400) {
+            int theme = UserPreferences.getTheme();
+            if (theme == R.style.Theme_AntennaPod_Light) {
+                prefs.edit().putString(UserPreferences.PREF_THEME, "system").apply();
+            }
+        }
     }
 }

app/src/main/res/xml/preferences_user_interface.xml

@@ -10,7 +10,7 @@
                 android:title="@string/pref_set_theme_title"
                 android:key="prefTheme"
                 android:summary="@string/pref_set_theme_sum"
-                android:defaultValue="0"
+                android:defaultValue="system"
                 app:useStockLayout="true"/>
         <Preference
                 android:key="prefHiddenDrawerItems"

core/src/main/java/de/danoeh/antennapod/core/preferences/UserPreferences.java

@@ -2,6 +2,7 @@ package de.danoeh.antennapod.core.preferences;
 
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.content.res.Configuration;
 import android.preference.PreferenceManager;
 import android.support.annotation.IntRange;
 import android.support.annotation.NonNull;
@@ -164,7 +165,7 @@ public class UserPreferences {
      * @return R.style.Theme_AntennaPod_Light or R.style.Theme_AntennaPod_Dark
      */
     public static int getTheme() {
-        return readThemeValue(prefs.getString(PREF_THEME, "0"));
+        return readThemeValue(prefs.getString(PREF_THEME, "system"));
     }
 
     public static int getNoTitleTheme() {
@@ -672,14 +673,18 @@ public class UserPreferences {
     }
 
     private static int readThemeValue(String valueFromPrefs) {
-        switch (Integer.parseInt(valueFromPrefs)) {
+        switch (valueFromPrefs) {
-            case 0:
+            case "0":
                 return R.style.Theme_AntennaPod_Light;
-            case 1:
+            case "1":
                 return R.style.Theme_AntennaPod_Dark;
-            case 2:
+            case "2":
                 return R.style.Theme_AntennaPod_TrueBlack;
             default:
+                int nightMode = context.getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;
+                if (nightMode == Configuration.UI_MODE_NIGHT_YES) {
+                    return R.style.Theme_AntennaPod_Dark;
+                }
                 return R.style.Theme_AntennaPod_Light;
         }
     }

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

@@ -164,11 +164,14 @@
     </string-array>
 
     <string-array name="theme_options">
+        <item>@string/pref_theme_title_use_system</item>
         <item>@string/pref_theme_title_light</item>
         <item>@string/pref_theme_title_dark</item>
         <item>@string/pref_theme_title_trueblack</item>
     </string-array>
+
     <string-array name="theme_values">
+        <item>system</item>
         <item>0</item>
         <item>1</item>
         <item>2</item>

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

@@ -424,6 +424,7 @@
     <string name="pref_parallel_downloads_title">Parallel Downloads</string>
     <string name="pref_episode_cache_title">Episode Cache</string>
     <string name="pref_episode_cache_summary">Total number of downloaded episodes cached on the device. Automatic download will be suspended if this number is reached.</string>
+    <string name="pref_theme_title_use_system">Use system theme</string>
     <string name="pref_theme_title_light">Light</string>
     <string name="pref_theme_title_dark">Dark</string>
     <string name="pref_theme_title_trueblack">Black (AMOLED ready)</string>