Added option to disable audio ducking.

app/src/main/java/com/kabouzeid/gramophone/service/MusicService.java

@@ -55,6 +55,8 @@ import java.lang.ref.WeakReference;
 import java.util.ArrayList;
 import java.util.List;
 
+import hugo.weaving.DebugLog;
+
 /**
  * @author Karim Abou Zeid (kabouzeid), Andrew Neal
  */
@@ -115,6 +117,7 @@ public class MusicService extends Service implements SharedPreferences.OnSharedP
     private int nextPosition = -1;
     private int shuffleMode;
     private int repeatMode;
+    private boolean audioDucking;
     private boolean pausedByTransientLossOfFocus;
     private boolean receiversAndRemoteControlClientRegistered;
     private PlayingNotificationHelper playingNotificationHelper;
@@ -162,6 +165,8 @@ public class MusicService extends Service implements SharedPreferences.OnSharedP
         wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, getClass().getName());
         wakeLock.setReferenceCounted(false);
 
+        audioDucking = PreferenceUtil.getInstance(this).audioDucking();
+
         musicPlayerHandlerThread = new HandlerThread("PlaybackHandler");
         musicPlayerHandlerThread.start();
         playerHandler = new PlaybackHandler(this, musicPlayerHandlerThread.getLooper());
@@ -987,6 +992,9 @@ public class MusicService extends Service implements SharedPreferences.OnSharedP
     @Override
     public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
         switch (key) {
+            case PreferenceUtil.AUDIO_DUCKING:
+                audioDucking = sharedPreferences.getBoolean(key, true);
+                break;
             case PreferenceUtil.GAPLESS_PLAYBACK:
                 if (sharedPreferences.getBoolean(key, false)) {
                     prepareNext();
@@ -1025,6 +1033,7 @@ public class MusicService extends Service implements SharedPreferences.OnSharedP
             mService = new WeakReference<>(service);
         }
 
+        @DebugLog
         @Override
         public void handleMessage(@NonNull final Message msg) {
             final MusicService service = mService.get();
@@ -1034,21 +1043,29 @@ public class MusicService extends Service implements SharedPreferences.OnSharedP
 
             switch (msg.what) {
                 case DUCK:
+                    if (service.audioDucking) {
                         currentDuckVolume -= .05f;
                         if (currentDuckVolume > .2f) {
                             sendEmptyMessageDelayed(DUCK, 10);
                         } else {
                             currentDuckVolume = .2f;
                         }
+                    } else {
+                        currentDuckVolume = 1f;
+                    }
                     service.playback.setVolume(currentDuckVolume);
                     break;
 
                 case UNDUCK:
+                    if (service.audioDucking) {
                         currentDuckVolume += .03f;
-                    if (currentDuckVolume < 1.0f) {
+                        if (currentDuckVolume < 1f) {
                             sendEmptyMessageDelayed(UNDUCK, 10);
                         } else {
-                        currentDuckVolume = 1.0f;
+                            currentDuckVolume = 1f;
+                        }
+                    } else {
+                        currentDuckVolume = 1f;
                     }
                     service.playback.setVolume(currentDuckVolume);
                     break;

app/src/main/java/com/kabouzeid/gramophone/util/PreferenceUtil.java

@@ -43,6 +43,7 @@ public final class PreferenceUtil {
 
     public static final String COLORED_NOTIFICATION = "colored_notification";
 
+    public static final String AUDIO_DUCKING = "audio_ducking";
     public static final String GAPLESS_PLAYBACK = "gapless_playback";
 
     public static final String LAST_ADDED_CUTOFF_TIMESTAMP = "last_added_cutoff_timestamp";
@@ -134,6 +135,10 @@ public final class PreferenceUtil {
         return mPreferences.getBoolean(GAPLESS_PLAYBACK, false);
     }
 
+    public final boolean audioDucking() {
+        return mPreferences.getBoolean(AUDIO_DUCKING, true);
+    }
+
     public final boolean albumArtOnLockscreen() {
         return mPreferences.getBoolean(ALBUM_ART_ON_LOCKSCREEN, true);
     }

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

@@ -129,6 +129,7 @@
     <string name="pref_title_alternative_progress_slider_now_playing">Alternative progress slider</string>
     <string name="pref_title_playback_controller_card_now_playing">Show card below playback controls</string>
     <string name="pref_title_colored_playback_controls_now_playing">Colored playback controls</string>
+    <string name="pref_title_audio_ducking">Reduce volume on focus loss</string>
     <string name="no_equalizer">No equalizer found.</string>
     <string name="no_audio_ID">"Play a song first, then try again."</string>
     <string name="delete_action">Delete</string>
@@ -166,6 +167,7 @@
     <string name="pref_summary_ignore_media_store_artwork">Can increase the album cover quality but causes slower image loading times. Only enable this if you have problems with low resolution artworks.</string>
     <string name="pref_summary_colored_playback_controls_now_playing">Colors play/pause, shuffle and repeat as well as the progress slider in the album cover\u2019s vibrant color.</string>
     <string name="pref_summary_colored_navigation_bar">Colors the navigation bar in the primary color.</string>
+    <string name="pref_summary_audio_ducking">Notifications, navigation etc.</string>
     <string name="could_not_download_album_cover">"Couldn\u2019t download a matching album cover."</string>
     <string name="search_hint">Search your library…</string>
     <string name="rescanning_media">Rescanning media…</string>

app/src/main/res/xml/pref_audio.xml

@@ -3,6 +3,12 @@
 
     <com.kabouzeid.appthemehelper.common.prefs.supportv7.ATEPreferenceCategory android:title="@string/pref_header_audio">
 
+        <com.kabouzeid.appthemehelper.common.prefs.supportv7.ATESwitchPreference
+            android:defaultValue="true"
+            android:key="audio_ducking"
+            android:summary="@string/pref_summary_audio_ducking"
+            android:title="@string/pref_title_audio_ducking" />
+
         <com.kabouzeid.appthemehelper.common.prefs.supportv7.ATESwitchPreference
             android:defaultValue="false"
             android:key="gapless_playback"