why I don't call url from Http request when onCompletion

I want to call new url after My custom Music Player complete played but It do not call and send new url to my player. Help me please thank you.

public void onCompletion(MediaPlayer arg0) 
{
    playing = "Stopped";
    new Thread(new Runnable() 
    {
        @Override
        public void run() 
        {
            now++;
            try
            {
                onCompleteURL = new URL(musicUrl[now]);
                onCompleteURLConnection = onCompleteURL.openConnection(); 
                onCompleteReadIn = new BufferedReader(new InputStreamReader(onCompleteURLConnection.getInputStream()));
                onCompleteUrl = onCompleteReadIn.readLine();
                onCompleteReadIn.close();
            } 
            catch (Exception e) 
            {
                e.printStackTrace();
            }
            waitingGetNextDataHandler1.sendEmptyMessage(0);
        }
    }).start();
    waitingGetNextDataHandler1 = new Handler()
    {
        public void handleMessage(Message msg) 
        {
            super.handleMessage(msg);
            try 
            {
                /*mMediaPlayer.reset();
                sendHTTPRequest();
                startPlayer();*/
                mMediaPlayer.reset();
                mMediaPlayer.setDataSource(onCompleteUrl);
                mMediaPlayer.prepare();
                开发者_高级运维mMediaPlayer.start();
                playing = "Started";
                running = mMediaPlayer.isPlaying();
                playPauseImageButton.setBackgroundResource(R.drawable.pause_button);
            } 
            catch (Exception e) 
            {
                e.printStackTrace();
            }
            if(mMediaPlayer != null)
            {
                if(mMediaPlayer.isPlaying() == true)
                {
                    playPauseImageButton.setBackgroundResource(R.drawable.pause_button);
                }
                else
                {
                    playPauseImageButton.setBackgroundResource(R.drawable.play_button);
                }
                setValue();
            }
        }
    };
}