Question

我需要一种不断播放活动的背景音乐。我想在点击主页按钮时停止我的背景音乐。

这是我的服务代码。

public class BackgroundSoundService extends Service
{ 

private static final String TAG = null;

MediaPlayer player;

Context context;
private int length = 0;

public IBinder onBind(Intent arg0) {
              return null;   
}

@Override
public void onCreate() {
    super.onCreate();
    player = MediaPlayer.create(this, R.raw.haha);
    player.setLooping(true); // Set looping
    player.setVolume(100,100);



}
public int onStartCommand(Intent intent, int flags, int startId) {
    player.start();
    return 1;

}
 @Override
  public void onStart(Intent intent, int startId) {

   player.start();

  }

  public IBinder onUnBind(Intent arg0) {

  return null;
}

public void onStop() {
    player.stop();
    player.release();
    player = null;
}
public void onPause() {

    player.pause();

        }

public void onHomePressed(){
    player.stop();

}
public void pauseMusic()
{
    if(player.isPlaying())
    {
        player.pause();
        length=player.getCurrentPosition();

    }
}

public void resumeMusic()
{
    if(player.isPlaying()==false)
    {
        player.seekTo(length);
        player.start();
    }
}
@Override
public void onDestroy() {
    super.onDestroy();
    if(player != null)
    {
    try{
     player.stop();
     player.release();
        }finally {
            player = null;
        }
    }
}

@Override
public void onLowMemory() {


}

public boolean onError(MediaPlayer mp, int what, int extra) {

    Toast.makeText(this, "music player failed", Toast.LENGTH_SHORT).show();
    if(player != null)
    {
        try{
            player.stop();
            player.release();
        }finally {
            player = null;
        }
    }
    return false;
 }
 }

这是我的第一个活动类

 public class AdventureTime extends Activity implements OnClickListener {


public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.story);


    Intent svc=new Intent(this, BackgroundSoundService.class);
    startService(svc);  

    View story1 = this.findViewById(R.id.button1);
    story1.setOnClickListener(this);

    View story2 = this.findViewById(R.id.button2);
    story2.setOnClickListener(this);

    View story3 = this.findViewById(R.id.button3);
    story3.setOnClickListener(this);

    View back= this.findViewById(R.id.buttonback);
    back.setOnClickListener(this);

}
            @Override
            public void onBackPressed(){

              new AlertDialog.Builder(this).setIcon(android.R.drawable.ic_dialog_alert).setTitle("Exit")
              .setMessage("Are you sure you want to exit?")
               .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                                       @Override
                                       public void onClick(DialogInterface dialog, int which) {
                                          Intent intent = new Intent(Intent.ACTION_MAIN);
                                          intent.addCategory(Intent.CATEGORY_HOME);
                                          intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                                          startActivity(intent);
                                          System.exit(0);

                                       }
             }).setNegativeButton("No", null).show();
            }  

public void onClick(View v) {

    switch(v.getId()){
    case R.id.button1:
        Intent button1 = new Intent(this, Story1.class);
        startActivity(button1);
        break;

    case R.id.button2:
        Intent button2 = new Intent(this, Story2.class);
        startActivity(button2);
        break;

    case R.id.button3:
        Intent button3 = new Intent(this, Story3.class);
        startActivity(button3);
        break;

    case R.id.buttonback:
        Intent buttonback = new Intent(this, MainActivity.class);
        startActivity(buttonback);
        break;


    }     
 }
}

Answer 1

在活动AdventureTime中添加：

...
@Override
public void onPause(){
    stopService(svc);
    super.onPause();

}
...

Answer 2

如果您想在不停止服务的情况下暂停音乐试试这个在您的服务中添加此类

public class LocalBinder extends Binder {
    BackgroundSoundService getService() {
        return BackgroundSoundService.this;
    }
}

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

private final IBinder mBinder = new LocalBinder();

并在您的活动中添加此内容

private BackgroundSoundService mBoundService;

private ServiceConnection mConnection = new ServiceConnection() {
    public void onServiceConnected(ComponentName className, IBinder service) {
        mBoundService = ((BackgroundSoundService.LocalBinder)service).getService();

    }

    public void onServiceDisconnected(ComponentName className) {

        mBoundService = null;

    }
};

替换

    startService(svc)

带

    bindService(svc, mConnection, Context.BIND_AUTO_CREATE);

并在需要时调用暂停方法

mBoundService.pauseMusic();

Answer 3

为什么不尝试收听dispatchKeyEvent呢？你可以写：

@Override
public boolean dispatchKeyEvent(KeyEvent event) {

    if (event.getKeyCode() == KeyEvent.KEYCODE_HOME) {
        stopService(svc)
        return true;
    }
    else
        return super.dispatchKeyEvent(event);
  }

您的每项活动。

Answer 4

你在mainActivity类上添加了这个。

 @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_HOME) {
// pause or stop ung Background music here.
            return true;
        }
        return false;
    }

如何停止音乐背景服务？

4 个答案: