-Expanded minimize to exit to allow resuming on background player.

-Modified minimize to exit toggle to selection dialog.

app/src/main/java/org/schabi/newpipe/player/MainVideoPlayer.java

@@ -213,12 +213,7 @@ public final class MainVideoPlayer extends AppCompatActivity
 
         isInMultiWindow = false;
 
-        if (playerImpl == null) return;
-        if (PlayerHelper.isMinimizeOnExitEnabled(this)) {
-            playerImpl.onFullScreenButtonClicked();
-        } else {
-            playerImpl.destroy();
-        }
+        if (playerImpl != null) playerImpl.terminate();
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -448,6 +443,20 @@ public final class MainVideoPlayer extends AppCompatActivity
             switchPopupButton.setOnClickListener(this);
         }
 
+        public void terminate() {
+            switch (PlayerHelper.getMinimizeOnExitAction(context)) {
+                case PlayerHelper.MinimizeMode.MINIMIZE_ON_EXIT_MODE_BACKGROUND:
+                    onPlayBackgroundButtonClicked();
+                    break;
+                case PlayerHelper.MinimizeMode.MINIMIZE_ON_EXIT_MODE_POPUP:
+                    onFullScreenButtonClicked();
+                    break;
+                case PlayerHelper.MinimizeMode.MINIMIZE_ON_EXIT_MODE_NONE:
+                    destroy();
+                    break;
+            }
+        }
+
         /*//////////////////////////////////////////////////////////////////////////
         // ExoPlayer Video Listener
         //////////////////////////////////////////////////////////////////////////*/

app/src/main/java/org/schabi/newpipe/player/helper/PlayerHelper.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.os.Build;
 import android.preference.PreferenceManager;
+import android.support.annotation.IntDef;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.view.accessibility.CaptioningManager;
@@ -28,6 +29,7 @@ import org.schabi.newpipe.player.playqueue.PlayQueue;
 import org.schabi.newpipe.player.playqueue.PlayQueueItem;
 import org.schabi.newpipe.player.playqueue.SinglePlayQueue;
 
+import java.lang.annotation.Retention;
 import java.text.DecimalFormat;
 import java.text.NumberFormat;
 import java.util.ArrayList;
@@ -42,6 +44,8 @@ import java.util.concurrent.TimeUnit;
 import static com.google.android.exoplayer2.ui.AspectRatioFrameLayout.RESIZE_MODE_FILL;
 import static com.google.android.exoplayer2.ui.AspectRatioFrameLayout.RESIZE_MODE_FIT;
 import static com.google.android.exoplayer2.ui.AspectRatioFrameLayout.RESIZE_MODE_ZOOM;
+import static java.lang.annotation.RetentionPolicy.SOURCE;
+import static org.schabi.newpipe.player.helper.PlayerHelper.MinimizeMode.*;
 
 public class PlayerHelper {
     private PlayerHelper() {}
@@ -51,6 +55,14 @@ public class PlayerHelper {
     private static final NumberFormat speedFormatter = new DecimalFormat("0.##x");
     private static final NumberFormat pitchFormatter = new DecimalFormat("##%");
 
+    @Retention(SOURCE)
+    @IntDef({MINIMIZE_ON_EXIT_MODE_NONE, MINIMIZE_ON_EXIT_MODE_BACKGROUND,
+            MINIMIZE_ON_EXIT_MODE_POPUP})
+    public @interface MinimizeMode {
+        int MINIMIZE_ON_EXIT_MODE_NONE = 0;
+        int MINIMIZE_ON_EXIT_MODE_BACKGROUND = 1;
+        int MINIMIZE_ON_EXIT_MODE_POPUP = 2;
+    }
     ////////////////////////////////////////////////////////////////////////////
     // Exposed helpers
     ////////////////////////////////////////////////////////////////////////////
@@ -173,8 +185,20 @@ public class PlayerHelper {
         return isAutoQueueEnabled(context, false);
     }
 
-    public static boolean isMinimizeOnExitEnabled(@NonNull final Context context) {
-        return isMinimizeOnExitEnabled(context, false);
+    @MinimizeMode
+    public static int getMinimizeOnExitAction(@NonNull final Context context) {
+        final String defaultAction = context.getString(R.string.minimize_on_exit_none_key);
+        final String popupAction = context.getString(R.string.minimize_on_exit_popup_key);
+        final String backgroundAction = context.getString(R.string.minimize_on_exit_background_key);
+
+        final String action = getMinimizeOnExitAction(context, defaultAction);
+        if (action.equals(popupAction)) {
+            return MINIMIZE_ON_EXIT_MODE_POPUP;
+        } else if (action.equals(backgroundAction)) {
+            return MINIMIZE_ON_EXIT_MODE_BACKGROUND;
+        } else {
+            return MINIMIZE_ON_EXIT_MODE_NONE;
+        }
     }
 
     @NonNull
@@ -326,7 +350,9 @@ public class PlayerHelper {
         }
     }
 
-    private static boolean isMinimizeOnExitEnabled(@NonNull final Context context, final boolean b) {
-        return getPreferences(context).getBoolean(context.getString(R.string.minimize_on_exit_key), b);
+    private static String getMinimizeOnExitAction(@NonNull final Context context,
+                                                  final String key) {
+        return getPreferences(context).getString(context.getString(R.string.minimize_on_exit_key),
+                key);
     }
 }

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

@@ -24,7 +24,22 @@
     <string name="auto_queue_key" translatable="false">auto_queue_key</string>
     <string name="screen_brightness_key" translatable="false">screen_brightness_key</string>
     <string name="screen_brightness_timestamp_key" translatable="false">screen_brightness_timestamp_key</string>
+
     <string name="minimize_on_exit_key" translatable="false">minimize_on_exit_key</string>
+    <string name="minimize_on_exit_value" translatable="false">@string/minimize_on_exit_none_key</string>
+    <string name="minimize_on_exit_none_key" translatable="false">minimize_on_exit_none_key</string>
+    <string name="minimize_on_exit_background_key" translatable="false">minimize_on_exit_background_key</string>
+    <string name="minimize_on_exit_popup_key" translatable="false">minimize_on_exit_popup_key</string>
+    <string-array name="minimize_on_exit_action_key" translatable="false">
+        <item>@string/minimize_on_exit_none_key</item>
+        <item>@string/minimize_on_exit_background_key</item>
+        <item>@string/minimize_on_exit_popup_key</item>
+    </string-array>
+    <string-array name="minimize_on_exit_action_description" translatable="false">
+        <item>@string/minimize_on_exit_none_description</item>
+        <item>@string/minimize_on_exit_background_description</item>
+        <item>@string/minimize_on_exit_popup_description</item>
+    </string-array>
 
     <string name="default_resolution_key" translatable="false">default_resolution</string>
     <string name="default_resolution_value" translatable="false">360p</string>

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

@@ -74,8 +74,6 @@
     <string name="popup_remember_size_pos_summary">Remember last size and position of popup</string>
     <string name="use_inexact_seek_title">Use fast inexact seek</string>
     <string name="use_inexact_seek_summary">Inexact seek allows the player to seek to positions faster with reduced precision</string>
-    <string name="minimize_on_exit_title">Minimize on exit</string>
-    <string name="minimize_on_exit_summary">Experimental. Switch to play on popup player when exiting main video player</string>
     <string name="download_thumbnail_title">Load thumbnails</string>
     <string name="download_thumbnail_summary">Disable to stop all thumbnails from loading and save on data and memory usage. Changing this will clear both in-memory and on-disk image cache.</string>
     <string name="thumbnail_cache_wipe_complete_notice">Image cache wiped</string>
@@ -506,4 +504,11 @@
         <item>144p</item>
     </string-array>
 
+    <!-- Minimize to exit action -->
+    <string name="minimize_on_exit_title">Minimize on exit</string>
+    <string name="minimize_on_exit_summary">Action when exiting main video player — %s</string>
+    <string name="minimize_on_exit_none_description">None</string>
+    <string name="minimize_on_exit_background_description">Minimize to background player</string>
+    <string name="minimize_on_exit_popup_description">Minimize to popup player</string>
+
 </resources>

app/src/main/res/xml/video_audio_settings.xml

@@ -90,6 +90,14 @@
             android:summary="@string/preferred_open_action_settings_summary"
             android:title="@string/preferred_open_action_settings_title"/>
 
+        <ListPreference
+            android:defaultValue="@string/minimize_on_exit_value"
+            android:entries="@array/minimize_on_exit_action_description"
+            android:entryValues="@array/minimize_on_exit_action_key"
+            android:key="@string/minimize_on_exit_key"
+            android:summary="@string/minimize_on_exit_summary"
+            android:title="@string/minimize_on_exit_title"/>
+
         <SwitchPreference
             android:defaultValue="false"
             android:key="@string/resume_on_audio_focus_gain_key"
@@ -113,11 +121,5 @@
             android:key="@string/use_inexact_seek_key"
             android:summary="@string/use_inexact_seek_summary"
             android:title="@string/use_inexact_seek_title"/>
-
-        <SwitchPreference
-            android:defaultValue="false"
-            android:key="@string/minimize_on_exit_key"
-            android:title="@string/minimize_on_exit_title"
-            android:summary="@string/minimize_on_exit_summary"/>
     </PreferenceCategory>
 </PreferenceScreen>