圆角button

在drawable文件中写

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<corners android:radius="5dp"/>
<solid android:color="@color/blue"></solid>
<padding
android:top="2dp"
android:bottom="2dp"/>

</shape>