看文档Develop/API Guides/App Resources/Drawable/Shape Drawable
单词:corners : 角 ; gradient :梯度; solid:固定的; stroke: 边框--可以做下划线
Rectangle : 矩形;dash :破折号 gap:间隙;
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="5dip"/>
<gradient android:startColor="#ff0000"
android:endColor="#00ff0000"/>
<solid android:color="#ffffff" />
<stroke android:width="3dip" android:color="#000000" android:dashGap="5dip"
android:dashWidth="5dip"/>
</shape>
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="5dip"/>
<solid android:color="#ffffff" />
</shape>
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="5dip"/>
<solid android:color="#22000000" />
</shape>
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:drawable="@drawable/function_greenbutton_pressed" /> <!-- pressed -->
<item android:state_focused="true"
android:drawable="@drawable/function_greenbutton_pressed" /> <!-- focused -->
<item android:drawable="@drawable/function_greenbutton_normal" /> <!-- default -->
</selector>
在Button框下android:background="@drawable/shape_bg"来调用。
原文:http://blog.csdn.net/zeb_perfect/article/details/44773897