Android MusicPlayer 5

MainActivity.java

    private Handler handler = new Handler(new Handler.Callback() {
        @Override
        public boolean handleMessage(Message msg) {
            int currentPosition = msg.what;
            // 再生位置を更新
            positionBar.setProgress(currentPosition);

            // 経過時間ラベル更新
            String elapsedTime = createTimeLabel(currentPosition);
            elapsedTimeLabel.setText(elapsedTime);

            // 残り時間ラベル更新
            String remainingTime = "- " + createTimeLabel(totalTime - currentPosition);
            remainingTimeLabel.setText(remainingTime);

            return true;
        }
    });