I use one button and i try to add two attrs in background property like add drawable xml and also want add ripple effect attrs "?attr/selectableItemBackground" Is it possible? My xml button code is here :- 
 <Button android:id="@+id/btnRead"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:background="@drawable/readmcq"
         android:text="@string/readmcq"
         android:textAllCaps="false"
         android:textColor="@color/colorWhite"
         android:textSize="12sp" />
Can i try like this android:background="@drawable/readmcq" | "?attr/selectableItemBackground" ??