Android Program to Change the Displayed Text alongside the Application Icon at Runtime

Here is source code of the Program to to Change the Displayed Text alongside the Application Icon at Runtime in Android using Java. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

MainActivity.java

package com.example.change_text_displayed_action_bar;
 
import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
 
@SuppressLint("NewApi")
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button change = (Button)findViewById(R.id.button1);
        change.setOnClickListener(new View.OnClickListener() {
 
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                ActionBar actionBar = getActionBar();
                actionBar.setSubtitle("Changed text");
                actionBar.setTitle("And the magic happens!!!!"); 
            }
        });
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}