Layer List

Layer List
管理一组drawable object, 最后一个在最上面。

文件存放位置：
res/drawable/filename.xml

语法：
<?xml version="1.0" encoding="utf-8"?>
<layer-list
    xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:drawable="@[package:]drawable/drawable_resource"
        android:id="@[+][package:]id/resource_name"
        android:top="dimension"
        android:right="dimension"
        android:bottom="dimension"
        android:left="dimension" />
</layer-list>用法:
bt_layer.xml
[html]
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
      <bitmap android:src="@drawable/a1"
        android:gravity="center" />
    </item>
    <item android:top="30dp" android:left="30dp">
      <bitmap android:src="@drawable/a2"
        android:gravity="center" />
    </item>
    
    <item android:top="60dp" android:left="60dp">
      <bitmap android:src="@drawable/a3"
        android:gravity="center" />
      </item>
    <item android:top="90dp" android:left="90dp">
      <bitmap android:src="@drawable/a4"
        android:gravity="center" />
    </item>
</layer-list>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
      <bitmap android:src="@drawable/a1"
        android:gravity="center" />
    </item>
    <item android:top="30dp" android:left="30dp">
      <bitmap android:src="@drawable/a2"
        android:gravity="center" />
    </item>
    
    <item android:top="60dp" android:left="60dp">
      <bitmap android:src="@drawable/a3"
        android:gravity="center" />
      </item>
    <item android:top="90dp" android:left="90dp">
      <bitmap android:src="@drawable/a4"
        android:gravity="center" />
    </item>
</layer-list>
[html]
<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignRight="@+id/button1"
    android:background="@drawable/bt_layer"
    android:text="sssssssssssssssssss2" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/button1"
        android:background="@drawable/bt_layer"
        android:text="sssssssssssssssssss2" />
效果：

补充：移动开发 , Android ,