Question

有没有办法可以将侦听器添加到布局或视图中，当用户触摸屏幕时，它会添加计数。像

这样的东西

    tvTouchCount.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            int count = 0;
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    count = count + 1;
                    if (count > maxCount)
                        maxCount = count;
                    tvTouchCount.setText("Max Count=" + maxCount);
                    return false;
                case MotionEvent.ACTION_UP:
                    count = count - 1;
                    return false;
                default:
                    return false;
            }
        }
    });

我已经尝试从软件包管理器获取详细信息，但这只能告诉我它是否支持2个，2-5个和5个以上的独立触摸，而不是确切的数字

Answer 1

您可以从动作事件中获取指针数。

new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        int pointersCount = event.getPointerCount()
    }
}

关于可用触摸的最大数量，您可以通过PackageManager进行检查。

PackageManager packageManager = context.getPackageManager()
if (packageManager.hasSystemFeature(FEATURE_TOUCHSCREEN_MULTITOUCH)) {
    //The device's supports basic two-finger gesture detection.
}

if (packageManager.hasSystemFeature(FEATURE_TOUCHSCREEN_MULTITOUCH_DISTINCT)) {
    //The device's capable of tracking two or more fingers fully independently.
}

if (packageManager.hasSystemFeature(FEATURE_TOUCHSCREEN_MULTITOUCH_JAZZHAND)) {
    //The device's is capable of tracking a full hand of fingers fully independently.
    //that is, 5 or more simultaneous independent pointers.
}

如何找到我的Android设备支持的最大触摸次数

1 个答案: