Android MusicPlayer 5

MainActivity.java

                    @Override
                    public void onStopTrackingTouch(SeekBar seekBar) {
                    }
                }
        );
        
        // Thread (positionBar・経過時間ラベル・残り時間ラベルを更新する)
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (mp != null) {
                    try {
                        Message msg = new Message();
                        msg.what = mp.getCurrentPosition();
                        handler.sendMessage(msg);
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {}
                }
            }
        }).start();
    }

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            int currentPosition = msg.what;
        }
    };

    public void playBtnClick(View view) {
        if (!mp.isPlaying()) {