2
我做了一個流媒體播放器，它運行在一個單獨的服務而不是MainActivity上。當用戶查詢進度時更新SeekBar位置 我正在使用廣播接收器來告訴服務有關用戶所尋找的位置。之後服務提取查找位置，並且 更新MainActivity中SeekBar的當前位置。Android更新MediaPlayer SeekBar從服務類別的位置
一切正常，但當用戶快速移動SeekBar時，服務類別 凍結了MainActivity的UI，並且一些時間崩潰。從Service類更新MainActivity的SeekBar的最佳方法是什麼？
代碼樣本，
MainActivity，
// Set up constant ID for broadcast of seekbar position
public static final String BROADCAST_SEEKBAR = "com.gm.sendseekbar";
private Intent intent;
@Override
public void onProgressChanged(SeekBar sb, int progress, boolean fromUser) {
// TODO Auto-generated method stub
if (fromUser) {
int seekPos = sb.getProgress();
intent.putExtra("seekpos", seekPos);
sendBroadcast(intent);
}
}
服務類，
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
mp = new MediaPlayer();
mp.setOnBufferingUpdateListener(this);
mp.setOnCompletionListener(this);
mp.setOnInfoListener(this);
mp.setOnPreparedListener(this);
mp.setOnSeekCompleteListener(this);
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// Set up receiver for seekbar change
registerReceiver(broadcastReceiver, new IntentFilter(
ActivityMain.BROADCAST_SEEKBAR));
}
// Receive seekbar position if it has been changed by the user in the main activity
private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
sendBufferStartBroadcast();
updateSeekPos(intent);
}
};
// Update seek position from Activity
public void updateSeekPos(Intent intent) {
int seekPos = intent.getIntExtra("seekpos", 0);
if (mp.isPlaying()) {
int playPositionInMillisecconds = (mediaFileLengthInMilliseconds/100)
* seekPos;
mp.seekTo(playPositionInMillisecconds);
}
}