Android Application

package com.example.helloworld; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class HelloWorld extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView hw = new TextView(this); hw.setText("Hello World"); setContentView(hw); } }

Android is the Operating System for mobile devices which also include Middleware and key Application.Android applications are written in java programming language through Android SDK (Software development kit) which provides the APIs and libraries to develop applications for mobile devices.