android 代码生成图形

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">


    <!-- 颜色选择器 定义个图形资源 在不同的选择状态下 会显示出来不同风格的内容 -->
    <item android:drawable="@drawable/main_item_pressed" android:state_pressed="true"/>
 <!-- pressed -->
    <item android:drawable="@drawable/main_item_pressed" android:state_focused="true"/>
 <!-- focused -->
    <item android:drawable="@color/bind_sim_normal"/>
 <!-- default -->


</selector>


------------------------------
main_item_pressed


<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >


    <solid android:color="#22ffffff" >
    </solid>


    <stroke
        android:width="0.5dip"
        android:color="@android:color/black" />


    <padding
        android:bottom="1dip"
        android:left="1dip"
        android:right="1dip"
        android:top="1dip" />


</shape>
-------------------------------------
bind_sim_normal.xml


<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="bind_sim_normal">#44000000</color>
    <color name="gray">#33000000</color>
    <color name="white">#ffffff</color>
    
</resources>