Add and respond Action Items on Action Bar

We can override onCreateOptionsMenu() and onOptionsItemSelected() to add and respond Action Items on Action Bar.

Example:

package com.exercise.AndroidActionBar;

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

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();
   }});
    }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  super.onCreateOptionsMenu(menu);
  
  /*
   *  menu.add(int groupId, int itemId, int order, CharSequence title);
   */
  menu.add(0, 0, 0, "Action Item 0");
  menu.add(0, 1, 1, "Action Item 1");
  menu.add(0, 2, 2, "Action Item 2");
  menu.add(0, 3, 3, "Action Item 3");
  menu.add(0, 4, 4, "Action Item 4");
  
  return true;
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  
  switch(item.getItemId()){
  case 0:
   Toast.makeText(AndroidActionBarActivity.this, 
     "Action Item 0 selected!", 
     Toast.LENGTH_LONG).show();
   return true;
  case 1:
   Toast.makeText(AndroidActionBarActivity.this, 
     "Action Item 1 selected!", 
     Toast.LENGTH_LONG).show();
   return true;
  case 2:
   Toast.makeText(AndroidActionBarActivity.this, 
     "Action Item 2 selected!", 
     Toast.LENGTH_LONG).show();
   return true;
  case 3:
   Toast.makeText(AndroidActionBarActivity.this, 
     "Action Item 3 selected!", 
     Toast.LENGTH_LONG).show();
   return true;
  case 4:
   Toast.makeText(AndroidActionBarActivity.this, 
     "Action Item 4 selected!", 
     Toast.LENGTH_LONG).show();
   return true;
  default:
   return false;
  
  }
  
 }
}

next:
- Show as Action Item with icon