Turn On/Off Action Bar

ActionBar on Android 3.0 (API level 11) is a window feature that identifies the application and user location, and provides user actions and navigation modes.

To turn it on/off programmatically, call ActionBar.show() and ActionBar.hide().

Example:

package com.exercise.AndroidActionBar;

import android.app.ActionBar;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class AndroidActionBarActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Button showActionBar = (Button)findViewById(R.id.showactionbar);
        Button hideActionBar = (Button)findViewById(R.id.hideactionbar);
        
        showActionBar.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    ActionBar actionBar = getActionBar();
    actionBar.show();
   }});
        
        hideActionBar.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    ActionBar actionBar = getActionBar();
    actionBar.hide();
   }});
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <Button
        android:id="@+id/showactionbar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Show Action Bar" />
    <Button
        android:id="@+id/hideactionbar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Hide Action Bar" />

</LinearLayout>

Related Article:
- Add and respond Action Items on Action Bar