Android, Button タップ時押せた感出し

 

btn_keypad_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/btn_rounded_border_red" android:state_selected="true"></item>
    <item android:drawable="@drawable/btn_rounded_border_red_pressed" android:state_pressed="true"></item>
    <item android:drawable="@drawable/btn_rounded_border_red"></item>
</selector>

layout.xml

<Button
    android:id="@+id/btn_1"
    android:background="@drawable/btn_keypad_selector"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:layout_margin="5dp"
    android:text="1" />