android: RecyclerView inside a ScrollView

Question

I have a RecyclerView wrapped in a LinearLayout and it works perfectly as expected. I can see all the data in the RecyclerView as populated. So far so good.

When I wrap the LinearLayout in a ScrollView, the RecyclerView goes blank. I do not see anything inside RecyclerView. Why? How to make this work.

The page is one of the tabs in a ViewPagerIndicator, so everything in that tab needs to be in a ScrollView.

Thanks for all the help.

Solution 1

Set this property for the ScrollView,

 android:fillViewport="true"

ScrollView will extend itself to fill the contents

Solution 2

After checking implementation, the reason appears to be the following. If RecyclerView gets put into a ScrollView, then during measure step its height is unspecified (because ScrollView allows any height) and, as a result, gets equal to minimum height (as per implementation) which is apparently zero.

You have couple of options for fixing this:

• Set a certain height to RecyclerView
• Set ScrollView.fillViewport to true
• Or keep RecyclerView outside of ScrollView. I my opinion, this is the best option by far. If RecyclerView height is not limited - which is the case when it's put into ScrollView - then all Adapter's views have enough place vertically and get created all at once. There is no view recycling anymore which kinda breaks the purpose of RecyclerView.

Solution 3

Nothing helped me except this:

mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        int action = e.getAction();
        switch (action) {
        case MotionEvent.ACTION_MOVE:
            rv.getParent().requestDisallowInterceptTouchEvent(true);
            break;
    }
    return false;
}

@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {

}

@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }
});

I got this answer there. Thank you Piyush Gupta for that.

Comments

[Jemshit Iskenderov]

@beworker i have 2 RecyclerViews and even i give certain heights, they won't be all visible when in landscape, so RecyclerView inside ScrollView becomes necessary

[SilentKnight]

It worked for me, but sometimes NullPointerException occurred.

[Sathesh]

I would appreciate if you can provide a stack trace.

[Jemshit Iskenderov]

Don't confuse with fitsSystemWindows="true" guys

[dasar]

Perfect point. So recyclerView inside ScrollView can be replaced with some static view container.

[Khawar Raza]

I had a similar problem. I was using Recyclerview inside Recyclerview items. The inner Recyclerview was not scrolling at all. Your solution worked for me.