Android: How to make Circle through xml which looks like a halo -

i trying make circle using xml halo. halo starts green color in center, greenish color keeps fading , @ edges becomes transparent.

how go it?

i trying use following:

<shape xmlns:android="http://schemas.android.com/apk/res/android"     android:shape="oval">     <gradient   android:centercolor="@drawable/light_green" android:gradientradius="250" android:type="radial"          android:endcolor="@android:color/transparent"         android:angle="270"/> </shape> 

still not able desired effect. lead helpful.

try this:

<shape xmlns:android="http://schemas.android.com/apk/res/android"     android:shape="oval" >      <gradient         android:angle="270"         android:centercolor="#88ff0000"         android:centerx="50%p"         android:centery="50%p"         android:endcolor="#00ff0000"         android:gradientradius="50%p"         android:startcolor="#ffff0000"         android:type="radial" />        <size            android:height="80dp"            android:width="80dp" />  </shape> 

change color code , change centercolor's alpha code per requirement