代码用一个资源图片实现多种状态

标注起来部分为可用部分

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@mipmap/close_x_press" android:state_pressed="true" />
    <item android:drawable="@mipmap/close_x_press" android:state_focused="true" />
    <item android:drawable="@mipmap/close_x_press"  android:state_selected="true" />
    <item android:drawable="@mipmap/close_x_normal" android:state_enabled="false" />
    <item android:drawable="@mipmap/close_x_normal" />

    <!--<item android:state_pressed="true" >
        <bitmap android:src="@mipmap/close_x_normal" android:alpha="0.1" />
    </item>

    <item  android:state_focused="true" >
        <bitmap android:src="@mipmap/close_x_normal" android:alpha="0.1" />
    </item>

    <item android:state_selected="true" >
        <bitmap android:src="@mipmap/close_x_normal" android:alpha="0.1" />
    </item>

    <item android:state_enabled="false" >
        <bitmap android:src="@mipmap/close_x_normal" android:alpha="1" />
    </item>

    <item >
        <bitmap android:src="@mipmap/close_x_normal" android:alpha="1" />
    </item>-->
</selector>