android - How to change ActionBar title programmatically

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#f9fff5"     >     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Change ActionBar Title Text"         android:layout_marginTop="10dp"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.app.ActionBar;   public class MainActivity extends Activity {       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         tanggapan RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         tanggapan Button btn = (Button) findViewById(R.id.btn);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 // Get the ActionBar                 /*                     public ActionBar getActionBar ()                         Retrieve a reference to this activity's ActionBar.                      Returns                         The Activity's ActionBar, or null if it does not have one.                 */                 ActionBar ab = getActionBar();                  // Change the ActionBar title text                 /*                     public abstract void setTitle (CharSequence title)                         Set the action bar's title. This will only be                         displayed if DISPLAY_SHOW_TITLE is set.                 */                 ab.setTitle("This is new text for ActionBar title");             }         });     } }
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