Android播放器不会停止

MediaPlayer mediaPlayer = new MediaPlayer();
try {
    mediaPlayer.setDataSource("your_media_url");
    mediaPlayer.prepare();
    mediaPlayer.start();
} catch (IOException e) {
    e.printStackTrace();
} finally {
    if (mediaPlayer != null) {
        mediaPlayer.release();
        mediaPlayer = null;
    }
}

public class MyActivity extends AppCompatActivity {
    private MediaPlayer mediaPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mediaPlayer = new MediaPlayer();
        // 初始化播放器
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mediaPlayer != null) {
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.pause();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (mediaPlayer != null) {
            mediaPlayer.start();
        }
    }
}

public class MyService extends Service {
    private MediaPlayer mediaPlayer;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        mediaPlayer = new MediaPlayer();
        try {
            mediaPlayer.setDataSource("your_media_url");
            mediaPlayer.prepare();
            mediaPlayer.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return START_NOT_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (mediaPlayer != null) {
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer mp) {
        if (mp != null) {
            mp.release();
            mp = null;
        }
    }
});

synchronized (mediaPlayer) {
    if (mediaPlayer != null && mediaPlayer.isPlaying()) {
        mediaPlayer.stop();
    }
}