"Hello World" application worked on Android

I'm getting a bit interested in developing something for mobile application.
so, today, I investigated something about how to create an application worked on Android.

Android SDK
http://developer.android.com/sdk/index.html

Eclipse
http://www.eclipse.org/

Eclipse:

  *Eclipse IDE for Java Developers

Run the project as Android Application:

This kind of programming seems easy for beginners.

HelloWorld.java

package demo.android.helloworld; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class HelloWorld extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //setContentView(R.layout.main); TextView txt = new TextView(this); txt.setText("Hello World!"); setContentView(txt); } }