Android 9 Patch Image Button
<item android:drawable="@drawable/splash_facebook_button" />

<Button
        android:id="@+id/button1"
        android:layout_width="208dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="20dip"
        android:background="@drawable/splash_facebook_button_selector"
        android:text="Sign up with Facebook" />