android 常用渐变背景绘制

从上到下绘制如图所示

 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle">
     <gradient
         android:angle="270"
         android:endColor="#20a7ea"
         android:startColor="#4adcf9" />
 </shape>

从左到右绘制渐变色如图所示

　　    

 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
     <gradient android:startColor="#F8CE64" android:endColor="#FCAD79"/>
     <corners android:radius="24dp" />

     <corners
         android:bottomLeftRadius="20dip"
         android:bottomRightRadius="20dip"
         android:topLeftRadius="0dip"
         android:topRightRadius="0dip" />

 </shape>