How to properly highlight selected item on RecyclerView?

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This is much simple way to do it.

Have a private int selectedPos = RecyclerView.NO_POSITION; in the RecyclerView Adapter class, and under onBindViewHolder method try:

@Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {   
    viewHolder.itemView.setSelected(selectedPos == position);

}

And in your OnClick event modify:

@Override
public void onClick(View view) {
     notifyItemChanged(selectedPos);
     selectedPos = getLayoutPosition();
     notifyItemChanged(selectedPos); 
}

Works like a charm for Navigtional Drawer and other RecyclerView Item Adapters.

Note: Be sure to use a background color in your layout using a selector like colabug clarified:

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

Otherwise setSelected(..) will do nothing, rendering this solution useless.

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