Onclick Method Not Working Properly After Nestedscrollview Scrolled

onClick method not working properly after NestedScrollView scrolled

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.

onClick method inside RecyclerView not working after NestedScrollView scrolled

Okey, I found the solution here, we need:

public class FixAppBarLayoutBehavior extends AppBarLayout.Behavior {

public FixAppBarLayoutBehavior() {
    super();
}

public FixAppBarLayoutBehavior(Context context, AttributeSet attrs) {
    super(context, attrs);
}

@Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target,
                           int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int type) {
    super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed,
            dxUnconsumed, dyUnconsumed, type);
    stopNestedScrollIfNeeded(dyUnconsumed, child, target, type);
}

@Override
public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child,
                              View target, int dx, int dy, int[] consumed, int type) {
    super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type);
    stopNestedScrollIfNeeded(dy, child, target, type);
}

private void stopNestedScrollIfNeeded(int dy, AppBarLayout child, View target, int type) {
    if (type == ViewCompat.TYPE_NON_TOUCH) {
        final int currOffset = getTopAndBottomOffset();
        if ((dy < 0 && currOffset == 0)
                || (dy > 0 && currOffset == -child.getTotalScrollRange())) {
            ViewCompat.stopNestedScroll(target, ViewCompat.TYPE_NON_TOUCH);
        }
    }
}

}

and, in our AppBarLayout:

        <android.support.design.widget.AppBarLayout>
         ...
        app:layout_behavior="your.package.FixAppBarLayoutBehavior" 
         ... 
        </android.support.design.widget.AppBarLayout>

Items within NestedScrollView need to be clicked twice after scrolling to top or bottom

Apparently this is a bug:
https://code.google.com/p/android/issues/detail?id=178041

As of today, it's not fixed in the support library v23.

Clicklistener / Touchlistener on elements inside NestedScrollview do intercept scroll

It's a bug in the Android Support Library. See here: https://code.google.com/p/android/issues/detail?id=182549

Scrollview and OnClick handlers not working when view is cleared and re-created

I've managed to resolve the issue I was having. I tried what was suggested but unfortunately it didn't have a lot of effect.

What I had currently was one fragment, which had to linear layout containers, and when the view was switched one container was hidden and the container shown and then reload the relevant view content.

I've instead changed it so each view, is instead in a different fragment and with its own XML layout file, then when the view is switched, it uses a fragment transaction to replace one fragment view with the other and then uses the same code as I had above to dynamically populate the relevant view content.

RecyclerView onClick event is not working with SwipeRefreshLayout?

I had same problem not so long ago. I fixed mine by adding NestedScrollView as SwipeRefreshLayout child, and then simply put your recycler layout as NestedScrollView's child. See example below :

<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        android:id="@+id/mahadevSwipe"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        // I didn't put mandatory constraints, but you'll have to
        <androidx.core.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/mahadevRecyclerView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.5"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

        </androidx.core.widget.NestedScrollView>

    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

Alternatively, you could also keep your code like it is, and add custom scrolling behavior with scroll listener.
Tell me if my first guess don't work, i'll give you example of custom scroll handling.

Buttons inside fragments not firing first time in scroll view?

The issue is due to a bug in android support library NestedScrollView. It can be found here :
https://code.google.com/p/android/issues/detail?id=178041

This issue will most probably be fixed in next release. Till then you can see the workaround from this post :
onClick method not working properly after NestedScrollView scrolled

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