rename some existing methods in the playback interface

app/src/main/java/com/dkanada/gramophone/helper/StopWatch.java

@@ -1,5 +1,7 @@
 package com.dkanada.gramophone.helper;
 
+import androidx.annotation.NonNull;
+
 import java.util.Locale;
 
 public class StopWatch {
@@ -40,6 +42,7 @@ public class StopWatch {
         }
     }
 
+    @NonNull
     @Override
     public String toString() {
         return String.format(Locale.getDefault(), "%d millis", getElapsedTime());

app/src/main/java/com/dkanada/gramophone/service/MultiPlayer.java

@@ -247,24 +247,24 @@ public class MultiPlayer implements Playback {
     }
 
     @Override
-    public int position() {
+    public int getPosition() {
         if (!isReady) return -1;
         return (int) exoPlayer.getCurrentPosition();
     }
 
     @Override
-    public int duration() {
+    public int getDuration() {
         if (!isReady) return -1;
         return (int) exoPlayer.getDuration();
     }
 
     @Override
-    public void seek(int position) {
+    public void setPosition(int position) {
         exoPlayer.seekTo(position);
     }
 
     @Override
-    public void volume(float volume) {
+    public void setVolume(int volume) {
-        exoPlayer.setVolume(volume);
+        exoPlayer.setVolume(volume / 100f);
     }
 }

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

@@ -886,11 +886,11 @@ public class MusicService extends Service implements SharedPreferences.OnSharedP
     }
 
     public int getSongProgressMillis() {
-        return playback.position();
+        return playback.getPosition();
     }
 
     public int getSongDurationMillis() {
-        return playback.duration();
+        return playback.getDuration();
     }
 
     public long getQueueDurationMillis(int position) {
@@ -904,7 +904,7 @@ public class MusicService extends Service implements SharedPreferences.OnSharedP
 
     public int seek(int millis) {
         synchronized (this) {
-            playback.seek(millis);
+            playback.setPosition(millis);
             throttledSeekHandler.notifySeek();
             return millis;
         }
@@ -1060,7 +1060,7 @@ public class MusicService extends Service implements SharedPreferences.OnSharedP
     private static final class PlaybackHandler extends Handler {
         @NonNull
         private final WeakReference<MusicService> mService;
-        private float currentDuckVolume = 1.0f;
+        private int currentDuckVolume = 100;
 
         public PlaybackHandler(final MusicService service, @NonNull final Looper looper) {
             super(looper);
@@ -1077,32 +1077,32 @@ public class MusicService extends Service implements SharedPreferences.OnSharedP
             switch (msg.what) {
                 case DUCK:
                     if (PreferenceUtil.getInstance(service).getAudioDucking()) {
-                        currentDuckVolume -= 0.05f;
+                        currentDuckVolume -= 5;
-                        if (currentDuckVolume > 0.2f) {
+                        if (currentDuckVolume > 20) {
                             sendEmptyMessageDelayed(DUCK, 10);
                         } else {
-                            currentDuckVolume = 0.2f;
+                            currentDuckVolume = 20;
                         }
                     } else {
-                        currentDuckVolume = 1f;
+                        currentDuckVolume = 100;
                     }
 
-                    service.playback.volume(currentDuckVolume);
+                    service.playback.setVolume(currentDuckVolume);
                     break;
 
                 case UNDUCK:
                     if (PreferenceUtil.getInstance(service).getAudioDucking()) {
-                        currentDuckVolume += 0.03f;
+                        currentDuckVolume += 3;
-                        if (currentDuckVolume < 1f) {
+                        if (currentDuckVolume < 100) {
                             sendEmptyMessageDelayed(UNDUCK, 10);
                         } else {
-                            currentDuckVolume = 1f;
+                            currentDuckVolume = 100;
                         }
                     } else {
-                        currentDuckVolume = 1f;
+                        currentDuckVolume = 100;
                     }
 
-                    service.playback.volume(currentDuckVolume);
+                    service.playback.setVolume(currentDuckVolume);
                     break;
 
                 case TRACK_WENT_TO_NEXT:

app/src/main/java/com/dkanada/gramophone/service/playback/Playback.java

@@ -19,13 +19,13 @@ public interface Playback {
 
     boolean isPlaying();
 
-    int position();
+    int getPosition();
 
-    int duration();
+    int getDuration();
 
-    void seek(int position);
+    void setPosition(int position);
 
-    void volume(float volume);
+    void setVolume(int volume);
 
     interface PlaybackCallbacks {
         void onTrackStarted();