获取完成方法Android的静态时间

Question

我正在为Android播放音乐播放器，我需要获得静态时间才能开始播放音乐。 acutally命令context.player.start（）从范围＆lt; 2; 20＆gt;获取随机时间。 [ms]但我需要获得完成方法的静态时间。我的代码如下。我的意思是在呼叫方法时间和＃34之间的时间差。并且＆＃34;在方法完成时间之后＆＃34;需要是静态的（方法应该采取静态时间）

public class SpeakerActivity extends AppCompatActivity {


    MusicPlayer player;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_speaker);
        player = new MusicPlayer(SpeakerActivity.this);
        run();
    }

    private void run() {
       AsyncTask.execute(new Runnable() {
           @Override
           public void run() {
               ClientTask ct = new ClientTask(SpeakerActivity.this);
               try {
                   ct.run();
               } catch (IOException e1) {
                   e1.printStackTrace();
               }
           }

       });
    }

}


public class ClientTask extends Listener {

    ClientTask(Context context) { this.context = context);}

    ...


    //I'm only going to implement this method from Listener.class because I only need to use this one.
    public void received(Connection c, Object p){
        //Is the received packet the same class as PacketMessage.class?

        if(p instanceof PacketMessage){

            //Cast it, so we can access the message within.
            PacketMessage packet = (PacketMessage) p;


            if(packet.message.charAt(0) == 'p') {

                String latencyString = packet.message.replace('p','0');
                int latency = Integer.parseInt(latencyString);
                try {
                    Thread.sleep(latency);
                    context.player.start(); <---- THIS LINE TAKE RANDOM AMOUNT OF TIME
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }



            }
        }
    }


}


public class MusicPlayer {

    private MediaPlayer player;
    private Context context;

    public MusicPlayer(Context context) {
        this.context = context;
        player = MediaPlayer.create(context, R.raw.zero);
    }

    public void start() {
        player.start();
    }

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

}

有人知道什么是错的吗？