Android-layer List

Android-layer List

You can use Layer-list to cascade multiple drawable together in order.

1. We can achieve results through layer-list and selector

The graph is implemented by using a red background layer and a white background layer, and the white background layer is shifted upward by setting the android:bottom red background layer at the bottom of the graph. The Offset property is actually Margin a function.

Code:

<?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:drawable="@android:color/holo_red_dark" />            <item android:bottom="4dp" android:drawable="@android:color/white" />        </layer-list>    </item>    <item android:state_checked="false">        <layer-list>            <item android:drawable="@android:color/holo_red_dark" />            <item android:bottom="2dp" android:drawable="@android:color/white" />        </layer-list>    </item></selector>

2. Achieve Shadow Effect

Offset refers to moving the entire layer

<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <!-- 灰色阴影 -->    <item        android:left="2dp"        android:top="4dp">        <shape>            <solid android:color="@android:color/darker_gray" />            <corners android:radius="10dp" />        </shape>    </item>    <!-- 白色前景 -->    <item        android:bottom="4dp"        android:right="2dp">        <shape>            <solid android:color="#FFFFFF" />            <corners android:radius="10dp" />        </shape>    </item></layer-list>

Learning from: Keegan Steel (http://keeganlee.me/post/android/20150909)

Android-layer List