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监听遥控器的左键和右键，当连续按下左左右右后，弹出Toast

    private long liftTime = 0;
    private long rightTime = 0;
    int leftCount = 0;
    int rightCount = 0;
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode==KeyEvent.KEYCODE_DPAD_LEFT && event.getAction() == KeyEvent.ACTION_DOWN){
            leftCount++;
            liftTime = System.currentTimeMillis();
        }else if (keyCode==KeyEvent.KEYCODE_DPAD_RIGHT && event.getAction() == KeyEvent.ACTION_DOWN){
            rightCount++;
            rightTime = System.currentTimeMillis();
        }
        Log.e("TAG","rightTime-liftTime = "+(rightTime-liftTime));
        Log.e("TAG","leftCount = "+leftCount);
        Log.e("TAG","rightCount"+rightCount);

        if (rightTime-liftTime < 2000 && leftCount == 2 && rightCount == 2){
            leftCount = 0;
            rightCount = 0;
            Toast.makeText(this,"退出应用", Toast.LENGTH_SHORT).show();
        }
        return super.onKeyDown(keyCode, event);
    }