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>