Question

我有一个媒体播放器服务，我需要片段UI进行更新或与服务数据同步。目前，我正在使用广播发送和接收数据。但是我的问题是，在Android中有更好的方法吗？

服务中：

private void startBroadcast() {
    if(broadcastThread!= null && !broadcastThread.isInterrupted())
        broadcastThread.interrupt();
    broadcastThread = new Thread(){
        @Override
        public void run() {
            try {
                while(!isInterrupted()) {
                    Intent intent = new Intent(FILTER);
                    intent.putextra("foo",1);
                    sendBroadcast(intent);
                    sleep(1000);
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    };
    broadcastThread.start();
}

在片段中：

private BroadcastReceiver serviceReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        int foo= intent.getIntExtra("foo", 0);
        // bla bla
    }
};
.
.
@Override
public void onResume() {
    super.onResume();
    Objects.requireNonNull(getActivity()).registerReceiver(serviceReceiver ,FILTER);
}

Answer 1

您可以使用绑定服务将服务连接到您的活动然后用这个更新所有片段

bindService(oIntent, mServiceConnection, Context.BIND_AUTO_CREATE);

private ServiceConnection mServiceConnection = 
    new ServiceConnection(){
        public void onServiceConnected(
            ComponentName cName, IBinder service){
                MyBinder binder = (MyService.MyBinder) service;
                mService = binder.getService(); 
                // Get a reference to the Bound Service object.
                mServiceBound = true;
    }
    public void onServiceDisconnected(ComponentName cName){
        mServiceBound= false;
    }
};

在您要更改活动后，应该取消连接

if (mServiceBound){
        unbindService(mServiceConnection);
        mServiceBound = false;
}

Answer 2

我在MediaPlayer中也遇到了类似的问题，我也必须每秒钟更新一次UI组件。我使用了Runnable + Handler组合，像这样：

//...
private Handler mHandler;
private Runnable mSeekBarUpdater
//...

@Override
protected void onStart() {
    super.onStart();
 //...
    int result;
      // ...
    if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {

        mMediaPlayer.setOnCompletionListener(this);
        // Start playing and set isPlaying to true. This attribute is required on rotating screen
        mMediaPlayer.start();
        isPlaying = true;
        /**
         * Preparing Handler object and a Runnable in order to
         * update SeekBar status
         */
        if (mHandler == null) {
            mHandler = new Handler();
        }
        if (mSeekBarUpdater == null) {
            mSeekBarUpdater = new Runnable() {
                @Override
                public void run() {                
                    if (mMediaPlayer != null && mHandler != null) {
                        if (mMediaPlayer.isPlaying()) {
                            // Refreshing SeekBar position
                            mCurrentPosition = mMediaPlayer.getCurrentPosition();                              
                            mSeekBar.setProgress(mCurrentPosition);
// .. put your code here in order to refresh your UI components
                        }
                        // Refreshing on every second
                        mHandler.postDelayed(this, 1000);
                    }
                }
            };
        }
        PlayerActivity.this.runOnUiThread(mSeekBarUpdater);
    }
}

android-如何将数据从服务发送到片段“每秒”？

2 个答案: