1.有状态的图片资源

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true">
        <layer-list>
            <item android:width="@dimen/dimen_px_40" android:height="@dimen/dimen_px_40" android:drawable="@drawable/check_checked" />
        </layer-list>
    </item>
    <item android:state_checked="false">
        <layer-list>
            <item android:width="@dimen/dimen_px_40" android:height="@dimen/dimen_px_40" android:drawable="@drawable/check_normal" />
        </layer-list>
    </item>
</selector>

2.无状态的图片资源*

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:width="@dimen/dimen_px_40"
        android:height="@dimen/dimen_px_40"
        android:drawable="@drawable/check_checked" />
</layer-list>