Android:切换按钮，让按钮点击动画？

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <scale
            android:fromXScale="1.0"
            android:toXScale="0.9"
            android:fromYScale="1.0"
            android:toYScale="0.9"
            android:duration="100"
            android:pivotX="50%"
            android:pivotY="50%" />
    </item>
    <item>
        <scale
            android:fromXScale="0.9"
            android:toXScale="1.0"
            android:fromYScale="0.9"
            android:toYScale="1.0"
            android:duration="100"
            android:pivotX="50%"
            android:pivotY="50%" />
    </item>
</selector>

<Button
    android:id="@+id/btn_switch"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="切换"
    android:background="@drawable/button_click_animation" />

Button btnSwitch = findViewById(R.id.btn_switch);
btnSwitch.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // 处理按钮点击事件
    }
});