Create button with rounded corner

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#AAAAAA"/>
    <corners android:radius="15dp"/>
</shape>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <Button android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World, MainActivity!"
        android:textColor="#000000"
        android:padding="10dp"
        android:background="@drawable/button_rounded_background"/>

</LinearLayout>

import android.app.Activity;
import android.os.Bundle;
//w w  w  .  java  2 s .  c  om
public class MainActivity extends Activity {

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
  }
}