（转）NestedScrollView中首次点击无效

stackoverflow：http://stackoverflow.com/questions/31829976/onclick-method-not-working-properly-after-nestedscrollview-scrolled/32783524

It is a bug of the NestedScrollView, the detail of the bug can be found in here: issue. The problem is that mScroller.isFinished() in onInterceptTouchEvent(MotionEvent ev) will not return true after a fling operation (even if the fling is stopped). Therefore the touch event is intercepted.

This bug have been reported for a while, but still have not been fixed. So I have created by own version of bug fix for this problem. I implemented my own NestedScrollView, copied all the code from NestedScrollView and having the with the following amendments:

public class NestedScrollView extends FrameLayout implements NestedScrollingParent, NestedScrollingChild {
    ...
    private void initScrollView() {
        ...
        // replace this line:
        // mScroller = new ScrollerCompat(getContext(), null);
        mScroller = ScrollerCompat.create(getContext(), null);
        ...
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        ...
        switch (action & MotionEventCompat.ACTION_MASK) {
            ...
            case MotionEvent.ACTION_DOWN: {
                ...
                // replace this line:
                // mIsBeingDragged = !mScroller.isFinished();
                mIsBeingDragged = false;
                ...
            }
        }
    }
   
}

And this NestedScrollView should have the same behaviour as the original one.