android: RecyclerView inside a ScrollView

Set this property for the ScrollView,

 android:fillViewport="true"

ScrollView will extend itself to fill the contents

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.

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;}@Overridepublic void onTouchEvent(RecyclerView rv, MotionEvent e) {}@Overridepublic void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {    }});

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