highlight selected item in recyclerview android

To highlight the selected item in a RecyclerView in Android, you can use the android:background attribute in the layout file for the view holder.

Here's an example of how to do this:

First, create a selector drawable resource file that defines the different states of the item's background. For example:

<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:state_selected="true" android:drawable="@color/selected_color"/>
  <item android:drawable="@color/normal_color"/>
</selector>

Then, apply the selector drawable as the android:background attribute of the view holder's root layout in the layout file for the view holder:

<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="@drawable/selector">
  <!-- other layout elements go here -->
</LinearLayout>

Finally, in your RecyclerView.Adapter, set the selected state of the view holder by calling the setSelected() method of the view holder when the item is selected:

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
  holder.itemView.setSelected(selectedPos == position);
}

This will cause the background color of the selected item to change to the color defined in the selected_color state of the selector drawable.