如何检测点播监听器中的点击？

android java android-viewpager

2022-09-01 02:46:11

我有一个里面的.我需要能够水平和垂直滚动。为了实现这一点，每当触摸我时，都必须禁用垂直滚动（），以便可以水平滚动。ViewPagerScrollViewViewPagerv.getParent().requestDisallowInterceptTouchEvent(true);

但与此同时，我需要能够单击viewPager以全屏模式打开它。

问题是 onTouch 在 onClick 之前被调用，而我的 OnClick 永远不会被调用。

我如何在触摸和点击时实现这两个目标？

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);
    }
});

答案 1

Masoud Dadashi的回答帮助我弄清楚了。

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);
    } 
}

答案 2

通过检查用户触摸屏幕的时间，我做了一些非常简单的事情。

private static int CLICK_THRESHOLD = 100;

@Override
public boolean onTouch(View v, MotionEvent event) {
    long duration = event.getEventTime() - event.getDownTime();

    if (event.getAction() == MotionEvent.ACTION_UP && duration < CLICK_THRESHOLD) {
        Log.w("bla", "you clicked!");
    }

    return false;
}

同样值得注意的是，GestureDetector具有类似这样的内置功能。看看 onSingleTapUp