如何检测 onTouch 侦听器中的点击?

2022-01-19 00:00:00 android android-viewpager java

我在 ScrollView 中有一个 ViewPager.我需要能够水平和垂直滚动.为了实现这一点，必须在我的 ViewPager 被触摸时禁用垂直滚动 (v.getParent().requestDisallowInterceptTouchEvent(true);)，以便可以滚动它水平.

I have a ViewPager inside a ScrollView. I need to be able to scroll horizontally as well as vertically. In order to achieve this had to disable the vertical scrolling whenever my ViewPager is touched (v.getParent().requestDisallowInterceptTouchEvent(true);), so that it can be scrolled horizontally.

但同时我需要能够点击 viewPager 以全屏模式打开它.

But at the same time I need to be able to click the viewPager to open it in full screen mode.

问题是 onTouch 在 onClick 之前被调用，而我的 OnClick 从未被调用.

如何在触摸和点击时同时实现?

viewPager.setOnTouchListener(new OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        System.out.println("TOUCHED ");
        if(event.getAction() == MotionEvent.???){
            //open fullscreen activity
        }
        v.getParent().requestDisallowInterceptTouchEvent(true); //This cannot be removed
        return false;
    }
});

viewPager.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        System.out.println("CLICKED ");
        Intent fullPhotoIntent = new Intent(context, FullPhotoActivity.class);
        fullPhotoIntent.putStringArrayListExtra("imageUrls", imageUrls);
        startActivity(fullPhotoIntent);
    }
});

推荐答案

Masoud Dadashi 的回答帮我弄清楚了.

Masoud Dadashi's answer helped me figure it out.

这是它最终的样子.

viewPager.setOnTouchListener(new OnTouchListener() {
    private int CLICK_ACTION_THRESHOLD = 200;
    private float startX;
    private float startY;

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            startX = event.getX();
            startY = event.getY();
            break;
        case MotionEvent.ACTION_UP: 
            float endX = event.getX();
            float endY = event.getY();
            if (isAClick(startX, endX, startY, endY)) { 
                launchFullPhotoActivity(imageUrls);// WE HAVE A CLICK!!
            }
            break;
        }
        v.getParent().requestDisallowInterceptTouchEvent(true); //specific to my project
        return false; //specific to my project
    }

    private boolean isAClick(float startX, float endX, float startY, float endY) {
        float differenceX = Math.abs(startX - endX);
        float differenceY = Math.abs(startY - endY);
        return !(differenceX > CLICK_ACTION_THRESHOLD/* =5 */ || differenceY > CLICK_ACTION_THRESHOLD);
    } 
}

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