我有一个播放音乐的服务和一个提供与服务交互的 GUI 的活动。活动在列表项单击时打开(我有一个录音列表),它在 onCreate() 方法绑定服务(并创建它) .
调用 onDestroy() 时,我取消绑定服务(这将破坏服务) - 这应该没问题,因为如果退出活动,我不希望服务运行,但问题出现在方向更改上,因为它重新创建再次活动和服务(旋转设备时,曲目停止并从头开始播放)。
我知道一些可能有用的标志(orientationChange),但对我来说不是一个好习惯,因为我想要一个不同的横向布局。只要我的应用程序运行,我也可以让音乐播放器服务运行,但这不是一个好主意,因为用户可能不想打开播放器,而只想录制,所以播放器服务不一定在这里.
以下是一些代码片段:
@Override
protected void onCreate(Bundle savedInstanceState) {
LocalBroadcastManager.getInstance(this).registerReceiver(mLocalReceiver, new IntentFilter(PlayerBroadcastReceiver.ACTION_PLAYER_SERVICE_STARTED));
setContentView(R.layout.media_player_screen);
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioPlayerServiceBridge.getInstance().addCallback(this);
AudioPlayerServiceBridge.getInstance().doBindService(this);
init(savedInstanceState);
super.onCreate(savedInstanceState);
}
@Override
protected void onDestroy() {
LocalBroadcastManager.getInstance(this).unregisterReceiver(mLocalReceiver);
mLocalReceiver.removeCallback();
Log.d(AudioPlayerActivity.class.getName(), "onDestroy() -> "+AudioPlayerActivity.class.getName());
AudioPlayerServiceBridge.getInstance().doUnbindService(this);
AudioPlayerServiceBridge.getInstance().removeCallback(this);
super.onDestroy();
}
和服务连接管理器:
public void doBindService(Context context) {
// Establish a connection with the service. We use an explicit
// class name because there is no reason to be able to let other
// applications replace our component.
if(!mIsBound){
context.bindService(new Intent(context,
AudioPlayerService.class), serviceConnection, Context.BIND_AUTO_CREATE);
mIsBound = true;
}
}
public void doUnbindService(Context context) {
if (mIsBound) {
// If we have received the service, and hence registered with
// it, then now is the time to unregister.
if (mServiceMessenger != null) {
Message msg = Message.obtain(null, AudioPlayerService.MSG_UNREGISTER_CLIENT);
msg.replyTo = mMessenger;
mServiceMessenger.send(msg);
}
// Detach our existing connection.
context.unbindService(serviceConnection);
mIsBound = false;
}
}
如果可能的话,请告诉我一个处理这个问题的好习惯。