首先，在res下面新建一個文件夾drawable，在drawable下面新建三個xml文件：shape_corner_down.xml、shape_corner_up.xml和shape_corner.xml，分別是下面兩個角是圓角邊框，上面兩個角是圓角邊框，四個角全部是圓角邊框。
shape_corner_down.xml：
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<solid android:color=
"#0099CC"
/>
<corners android:bottomRightRadius=
"20dp"
android:bottomLeftRadius=
"20dp"
/>
<stroke android:width=
"1dp"
android:color=
"#000000"
/>
</shape>
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shape_corner_up.xml：
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<solid android:color=
"#CCCC99"
/>
<corners android:topLeftRadius=
"20dp"
android:topRightRadius=
"20dp"
/>
<stroke android:width=
"1dp"
android:color=
"#000000"
/>
</shape>
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shape_corner.xml：
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<?xml version=
"1.0"
encoding=
"utf-8"
?>
<solid android:color=
"#99CCFF"
/>
<corners android:topLeftRadius=
"20dp"
android:topRightRadius=
"20dp"
android:bottomRightRadius=
"20dp"
android:bottomLeftRadius=
"20dp"
/>
<stroke android:width=
"1dp"
android:color=
"#000000"
/>
</shape>
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<solid android:color>設置了背景顏色。android:topLeftRadius、android:topRightRadius、android:bottomLeftRadius、android:bottomRightRadius分別是左上角、右上角、左下角、右下角的半徑值，設置了半徑值，相應的角就是圓角，半徑值越大，圓角就越大。<stroke>設置邊界屬性，如邊界的寬度、顏色等。
在activity_main.xml上面放置三個LinearLayout，分別設置android:background屬性為shape_corner_up.xml、shape_corner_down.xml和shape_corner.xml，運行結果如下：
