将服务从一个活动传递到另一个活

Question

如何将服务从一个活动传递到另一个活动？我有一个显示歌曲列表的音乐播放器(Activity1),当您点击它时,它会在Activity1中启动该服务.我有一个按钮,用户可以单击该按钮打开Activity2.

那么我将服务从Activity1传递给Activity2的最佳方式是什么.如果服务在Activity1中启动,则Activity2应继续播放.如果未在Activity1中启动该服务,则Activity2应在使用之前启动该服务.

谢谢.

这是一些示例代码,MusicService是一个扩展服务类的类.

 public class Activity1 extends AppCompatActivity {

 private MusicService serviceMusic;  

private ServiceConnection musicConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        MusicService.PlayerBinder binder = (MusicService.PlayerBinder) service;
        //get service
        serviceMusic = binder.getService();
        serviceMusic.setSongList(songList);
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {

    }
};

}

Answer 1

我认为这将是更好的绑定服务,而不是通过一个静态全局服务.由于您有多个将使用相同服务的活动,因此应创建基本活动,如下所示:

BasicServiceActivity.java

public abstract class BasicServiceActivity extends AppCompatActivity {
    protected DvrService mDvrService;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_basic);
        attachService();
    }

    @Override
    protected void onDestroy() {
        detachService();
        super.onDestroy();
    }

    private ServiceConnection mServiceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder binder) {
            DvrService.DvrServiceBinder serviceBinder = (DvrService.DvrServiceBinder) binder;
            mDvrService = serviceBinder.getService();
            onServiceAttached(mDvrService);
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            mDvrService = null;
        }
    };

    private void attachService() {
        Intent service = new Intent(this, DvrService.class);
        bindService(service, mServiceConnection, Service.BIND_AUTO_CREATE);
    }

    private void detachService() {
        unbindService(mServiceConnection);
    }

    /** Callback when service attached. */
    protected void onServiceAttached(DvrService service) {
        // do something necessary by its subclass.
    }
}

然后你可以像这样实现子类活动:

public class ServiceActivity extends BasicServiceActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        startService(new Intent(this, DvrService.class));
    }

    @Override
    protected void onDestroy() {
        if (mDvrService != null) {
            mDvrService.removeListener1(mListener1);
        }
        super.onDestroy();
    }

    @Override
    protected void onServiceAttached(DvrService service) {
        // do your stuff, for example add a listener.
        service.addListener1(mListener1);
    }
}