2つのメディアサービスが同時に再生されます

Question

MainActivity（これはonDestroy()と呼ばれます）ボタンを押すと、メディアはバックグラウンドで再生されます（フォアグラウンドサービスを使用）。

しかし すべてのヘルプは高く評価されて？どのように私はこれを解決するのです。それは）onCreate()だ呼び出して、私は別の曲を再生しようとした場合、最初の曲が停止されていません。どちらの曲は一緒に演奏され（再びアプリを開いた後に（ 。

これは私のMusicServiceクラスです：

public void onCreate() { 
    super.onCreate(); 
    Log.i(TAG3, "onCreate"); 
    songPosn=0; 
    mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 
    mAudioManager.requestAudioFocus(this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN); 
    player = new MediaPlayer(); 
    initMusicPlayer(); 
    rand=new Random(); 
} 

//initializes the MediaPlayer class 
public void initMusicPlayer(){ 
    Log.i(TAG3, "initMusicPlayer"); 
    player.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK); 
    player.setAudioStreamType(AudioManager.STREAM_MUSIC); 
    player.setOnPreparedListener(this); 
    player.setOnCompletionListener(this); 
    player.setOnErrorListener(this); 
} 

public void setList(ArrayList<Song> theSongs){ 
    songs=theSongs; 
} 
//We will call this when the user picks a song from the list. 
public void setSong(int songIndex){ 
    songPosn=songIndex; 
} 

public class MusicBinder extends Binder { 
    MusicService getService() { 
     return MusicService.this; 
    } 
} 

//Let's now set the app up to play a track 
public void playSong(){ 
    Log.i(TAG3, "playSong"); 
    player.reset(); 
    //get song 
    Song playSong = songs.get(songPosn); 
    songTitle=playSong.getTitle(); 
    //get id 
    long currSong = playSong.getID(); 
    //set uri 
    Uri trackUri = ContentUris.withAppendedId(
      android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, 
      currSong); 

    try{ 
     player.setDataSource(getApplicationContext(), trackUri); 
    } 
    catch(Exception e){ 
     Log.e("MUSIC SERVICE", "Error setting data source", e); 
    } 
    player.prepareAsync(); 
} 

public void playPrev(){ 
    songPosn--; 
    if(songPosn<0) songPosn=songs.size()-1; 
    playSong(); 
} 

//skip to next 
public void playNext(){ 
    if(repeat){playSong();} 
    else if(shuffle){ 
     int newSong = songPosn; 
     while(newSong==songPosn){ 
      newSong=rand.nextInt(songs.size()); 
     } 
     songPosn=newSong; 
     playSong(); 
    } 
    else{ 
     songPosn++; 
     if(songPosn>=songs.size()) songPosn=0; 
     playSong(); 
    } 
} 

public int getPosn(){ 
    return player.getCurrentPosition(); 
} 

public int getDur(){ 
    return dr; 
} 

public boolean isPng(){ 
    return player.isPlaying(); 
} 

public void pausePlayer(){ 
    player.pause(); 
} 

public void seek(int posn){ 
    player.seekTo(posn); 
} 

public void go(){ 
    player.start(); 
} 

public void setShuffle(){ 
    if(shuffle) shuffle=false; 
    else {shuffle=true;repeat=false;} 
} 

public void setRepeat(){ 
    if(repeat) repeat=false; 
    else {repeat=true;shuffle=false;} 
} 

//When the MediaPlayer is prepared, the onPrepared method will be executed. 
@Override 
public void onPrepared(MediaPlayer mp) { 
    Log.i(TAG3, "onPrepared"); 
    //start playback 
    mp.start(); 
    dr = player.getDuration(); 
    Intent notIntent = new Intent(this, MainActivity.class); 
    notIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
    PendingIntent pendInt = PendingIntent.getActivity(this, 0, 
      notIntent, PendingIntent.FLAG_UPDATE_CURRENT); 

    Notification.Builder builder = new Notification.Builder(this); 

    builder.setContentIntent(pendInt) 
      .setSmallIcon(R.drawable.play) 
      .setTicker(songTitle) 
      .setOngoing(true) 
      .setContentTitle("Playing").setContentText(songTitle); 
    Notification not = builder.build(); 

    startForeground(NOTIFY_ID, not); 
} 

@Override 
public void onCompletion(MediaPlayer mp) { 
    Log.i(TAG3, "onCompletion"); 
    if(player.getCurrentPosition()>0){ 
     mp.reset(); 
     playNext(); 
    } 
} 

@Override 
public boolean onError(MediaPlayer mp, int what, int extra) { 
    Log.i(TAG3, "onError"); 
    mp.reset(); 
    return false; 
} 

@Override 
public void onAudioFocusChange(int focusChange) { 
    if(focusChange<=0) { 
     //LOSS -> PAUSE 
     player.pause(); 
    } else { 
     //GAIN -> PLAY 
     player.start(); 
    } 
} 

@Override 
public IBinder onBind(Intent intent) { 
    Log.i(TAG3, "onBind"); 
    return musicBind; 
} 

@Override 
public boolean onUnbind(Intent intent){ 
    Log.i(TAG3, "onUnbind"); 

    return false; 
} 

@Override 
public void onDestroy() { 
    Log.i(TAG3, "onDestroy"); 
    mAudioManager.abandonAudioFocus(this); 
    stopForeground(true); 
} 

注;再生がMainActivityにbackbuttonを押すことで停止しますので、私はonUnbind()からplayer.stop(); player.release();を削除していた

を。

Answer 1

戻るボタンは、押されたときにonDestroyを呼び出すべきではありません。 ここに見つかりました： https://stackoverflow.com/a/5868534/6737655