Question

我正在计算ACTION_DOWN后按下按钮的时间长短，具体取决于按下的时间长度 - 我在ACTION_UP中以不同的方式响应按下。

问题在于，当我执行action_down（按下）时，它不会倒计时到最后，有时会这样做。

代码：

    @Override
    public boolean onTouch(final View v, final MotionEvent e) {

        switch (e.getAction()) {
            case MotionEvent.ACTION_DOWN:
                still_down = false;

                main_timer = new CountDownTimer(500, 4) {
                    @Override
                    public void onTick(long millisUntilFinished) {
                        Log.wtf("x", "timer: " + millisUntilFinished);
                        if ((int) millisUntilFinished < 100 && e.getAction() == MotionEvent.ACTION_DOWN) {
                    // above is where i detect that timer does not count down to 0, it stops at 119,107 etc
                            still_down = true;
                        }
                    }
                    @Override
                    public void onFinish() {
                        if (still_down) {
                            Log.wtf("x", "SHOW THE LARGE CARD!!!!!!!!!!!!!!!!!");
                            answer.setTextSize(50);
                            RelativeLayout.LayoutParams x = new RelativeLayout.LayoutParams(350, 500);
                            x.setMargins(margin_long_press_x1, margin_long_press_y1, 0, 0);
                            answer.setLayoutParams(x);
                            answer.requestLayout();
                        }
                    }
                };
                main_timer.start();

                break;
            case MotionEvent.ACTION_UP:
                if (still_down) {

                    //image becomes small size again
                    main_timer.cancel();
                } else {
                    action_on_single_tap( e);
                }
                break;
        }

        return true;
    }

我在onTick（）中放入一个日志，看到计时器并不总是计为0。

有没有办法计算Android中按下按钮的时间长短？我不知道其他任何方式。

Answer 1

你走在正确的轨道上，看看它question几乎相同。

我发现这个最有帮助的

@Override
public boolean onTouch(View v, MotionEvent event) {
    if (event.getAction()==MotionEvent.ACTION_DOWN) {
        this.start = System.currentTimeMillis();
    } else if (event.getaction()==MotionEvent.ACTION_UP) {
        this.end = System.currentTimeMillis();
    }
}

Answer 2

在onTick中，if语句解释的操作始终为ACTION_DOWN，因为您可以在其中定义它。这就是为什么它总是在你设定的100门槛附近停止的原因。

如果您将倒数计时器声明移出onTouch处理程序，则可以更轻松地查看它们是如何分开的。试试这个。

private static final long TIMER_DURATION = 500;

private CountDownTimer countDownTimer = new CountDownTimer(TIMER_DURATION, 4) {
    @Override
    public void onTick(long millisUntilFinished) {
        // Don't need to do anything here
    }

    @Override
    public void onFinish() {
        Log.i("TimedTouchActivity", "Countdown timer finished!");
        // answer.setTextSize(50);
    }
};

@Override
public boolean onTouch(View v, MotionEvent event) {
    int action = event.getAction();
    if (action == MotionEvent.ACTION_DOWN) {
        Log.i("TimedTouchActivity", "Touch down");
        countDownTimer.start();
    } else if (action == MotionEvent.ACTION_UP) {
        Log.i("TimedTouchActivity", "Touch up");
        long eventDuration = event.getEventTime() - event.getDownTime();
        if (eventDuration < TIMER_DURATION) {
            Log.i("TimedTouchActivity", "Short");
            countDownTimer.cancel();
            // single click
        } else {
            Log.i("TimedTouchActivity", "Long");
            // answer.setTextSize(20);
        }
    }
    return true;
}

为什么我的倒计时器不会在某个时候运行到最后？[android]

2 个答案: