How can I create a pointy button like iPhone back button in Android XML ?

I want to create using like this
<?xml version="1.0" encoding="utf-8"?>
<selector
xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" >
<shape>
<gradient
android:startColor="#f8bb49"
android:endColor="#f7941d"
android:angle="270" />
<stroke
android:width="1dp"
android:color="#8c8382" />
<corners.....
Looks like you have an image you can work with. Read the docs on 9-patches to set margins and resizable areas.
http://developer.android.com/guide/developing/tools/draw9patch.html