How to implement background image color gradient in android

Commonly used, record it.
Rendering:

First create a new xml file bg_gradient.xml

<?xml version="1.0" encoding="utf-8"?>  
<shape xmlns:android="http://schemas.android.com/apk/res/android" >  
  
    <gradient  
        android:startColor="#55FF0000"   
        android:centerColor="#99A73C3C"  
        android:endColor="#99000000"  
        android:angle="270"  
        />  
  
    <corners android:radius="0dip" />  
  
</shape>

Quote in the layout file

android:background="@drawable/bg_gradient"

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