Recycler View loading very slow for large data when inside NestedScrollView

Question

I have added RecyclerView inside my NestedScrollView . Basically I want RecyclerView to scroll with other Views. The problem that I am facing is that for a small set of data, it is working fine, but for a large set of data(200 entries) whenever I launch the activity, it freezes for about about 3-5 seconds and then loads. I removed the NestedScrollView and it is working flawlessly, but it doesn't provide me the behaviour I want.

(For extra info, I am loading the data from SQLite database. There is no problem in scrolling, as it is smooth. The only problem is the activity is freezing for a while)

<android.support.v4.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

                <... Some other Views ...>

                <android.support.v7.widget.RecyclerView
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:orientation="vertical">

                </android.support.v7.widget.RecyclerView>

            </LinearLayout>

        </android.support.v4.widget.NestedScrollView>

Answer 1

This case of RecyclerView inside NestedScrollView .

RecyclerView is calling onCreateViewHolder() times equal to your data size.

If data has 200 items, it freezes for onCreateViewHolder() to be called 200 times.

Answer 2

The problem as said above is because RecyclerView as a child or subChild in NestedScrollView measures its height as infinitive when you use WRAP_CONTENT or MATCH_PARENT for height of RecyclerView.

one solution that solved this problem for me was setting the RecyclerView Height to a fixed size. you could set height to a dp value, or you could set it to a pixel value matching devices height if your requirements needs a vertical infinitive RecyclerView.

here is a snippet for setting the recyclerView size in kotlin

    val params = recyclerView.layoutParams
    params.apply {
            width = context.resources.displayMetrics.widthPixels
            height = context.resources.displayMetrics.heightPixels
    }
    recyclerView.layoutParams = params

Answer 3

I faced the same problem. The solution was to change NestedScrollView to SwipeRefreshLayout.

add this for enable/disable ToolBar Scrolling:

ViewCompat.setNestedScrollingEnabled(recyclerView, true);

Answer 4

As said by Nancy , recyclerview.setNestedScrollingEnabled(false); will solve scroll stuck issue. i too faced this type of issue and solved by false the NestedScroll.