how to get android gradient center light effect?

Make a new Android xml file (say GreyRadial.xml) file in your drawable folder

In your xml file

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <gradient
        android:centerColor="#c1c1c1"
        android:endColor="#4f4f4f"
        android:gradientRadius="400"
        android:startColor="#c1c1c1"
        android:type="radial" >
    </gradient>

</shape>

Use this xml in your layout background using

android:background="@drawable/GreyRadial"