Laggy RecyclerView

Question

My recyclerview scrolling is laggy. It lags when I started scrolling by touching the Recyclerview, but when doesn't lag when started from the view above it. I've also disabled nestedscrolling on recyclerview.

Here is my layout:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_height="match_parent" android:layout_width="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto"> <android.support.v4.widget.NestedScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:scrollbars="vertical" android:overScrollMode="never"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:focusable="true" android:focusableInTouchMode="true"> <TextView android:layout_width="match_parent" android:layout_height="200dp" android:text="HAHHAHA"/> <android.support.v7.widget.RecyclerView android:id="@+id/mRecyclerViewMain" android:layout_width="match_parent" android:layout_height="wrap_content" app:layout_behavior="@string/appbar_scrolling_view_behavior" android:background="@android:color/transparent"> </android.support.v7.widget.RecyclerView> </LinearLayout> </android.support.v4.widget.NestedScrollView> </FrameLayout>

Here is a video to the lag. It's like the scroll is skipping some layout.

@PriteshVadhiya I set the nestedscrolling to false in my OnCreate() method. mRecyclerViewMain.setNestedScrollingEnabled(false); — Charlie
– Charlie, Commented Aug 24, 2017 at 4:30
setting recyclerview with .setHasFixedSize(true) improve the performance a bit. Thanks — Charlie
– Charlie, Commented Aug 24, 2017 at 5:17

Nilam Vaddoriya · Accepted Answer · 2017-08-24 05:05:04Z

Modify your xml like this:

 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_height="match_parent" android:layout_width="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto"> <android.support.v7.widget.RecyclerView android:id="@+id/mRecyclerViewMain" android:layout_width="match_parent" android:layout_height="wrap_content" app:layout_behavior="@string/appbar_scrolling_view_behavior" android:background="@android:color/transparent"> </android.support.v7.widget.RecyclerView> </FrameLayout>

and set your textView in recyclerView's header,it will resolve your issue

<TextView android:layout_width="match_parent" android:layout_height="200dp" android:text="HAHHAHA"/>

in adapter class set viewType for header and items list

@Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { if (layoutInflater == null) layoutInflater = LayoutInflater.from(parent.getContext()); if (viewType == 0) { // bind your headerview } if (viewType == 1) { //bind your recyclerview } } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { if (holder instanceof HeaderHolder) // viewHolder for header view if (holder instanceof ListHolder) { // viewholder for list } }

using this you can pass viewType

@Override public int getItemViewType(int position) { if (position == 0) return 0; else if (ArrayList.size() == 0) return 1; }

performance is a little bit better by setting .setHasFixedSize(true) in recyclerview thanks anyway

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