This document is code for a simple "Hello World" Android application. It defines a MainActivity class that extends the Activity class and overrides its onCreate and onCreateOptionsMenu methods. The onCreate method sets the content view to the activity_main layout resource. The onCreateOptionsMenu method inflates the main menu resource and returns true.

2. HOLA MUNDO
package com.example.holamundo;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class MainActivityextends Activity{
@Override

3. protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu;this adds items to the actionbar ifit is present.
getMenuInflater().inflate(R.menu.main, menu);
returntrue;
}
}