android: RecyclerView inside a ScrollView

问题

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.

回答1:

Set this property for the ScrollView,

 android:fillViewport="true"

ScrollView will extend itself to fill the contents

回答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.

回答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.

回答4:

Hope this helps :

Add this line to your recyclerView xml :

android:nestedScrollingEnabled="false"

Try it ,recyclerview will be smoothly scrolled with flexible height inside scrollview .

来源：https://stackoverflow.com/questions/25515904/android-recyclerview-inside-a-scrollview

标签

android

viewpagerindicator

android-recyclerview