【Android】【动画】带帧动画的Selector

普通selector只能在两种状态图片之间切换，animated-selector允许通过帧动画从一个状态切换到另一个状态

XML代码：

<?xml version="1.0" encoding="utf-8"?>
<animated-selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/state_on"
		android:state_selected="true"
        android:drawable="@drawable/bt_switch_01"
         />
 
    <item
        android:id="@+id/state_off"
        android:state_selected="false"
        android:drawable="@drawable/bt_switch_10" />
 
    <transition
        android:fromId="@id/state_on"
        android:toId="@id/state_off">
        <animation-list>
            <item
                android:drawable="@drawable/bt_switch_01"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_02"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_03"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_04"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_05"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_06"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_07"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_08"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_09"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_10"
                android:duration="30" />
        </animation-list>
    </transition>
	
	    <transition
        android:fromId="@id/state_off"
        android:toId="@id/state_on">
        <animation-list>
            <item
                android:drawable="@drawable/bt_switch_10"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_09"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_08"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_07"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_06"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_05"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_04"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_03"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_02"
                android:duration="30" />
            <item
                android:drawable="@drawable/bt_switch_01"
                android:duration="30" />
        </animation-list>
    </transition>
</animated-selector>

Java代码：

            //将animated-selector设置为控件图像
            Drawable drawable = getResources().getDrawable(R.drawable.animated_selector);
            iv.setImageDrawable(drawable);
            //将控件设置为打开状态
            iv.setSelected(true);
            //将控件设置为关闭状态
            iv.setSelected(false);