Create Option Menu in Android Application

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/action_settings"
        android:orderInCategory="100"
        android:title="@string/action_settings"/>
</menu>


enter a label for your option in 
android:title="@string/action_settings
==============================================================

and type this coding in your layout java page
// this for create a menu in the layout
public boolean onCreateOptionsMenu(Menu menu) {

=============================================================

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.page, menu);
        return true;
    }
  //to catch the click option from the menu to identify which option selected  
// import MenuItem Library also
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle item selection
        switch (item.getItemId()) {
        
        case R.id.action_settings:
//if action_setting id is chosen it will cal newproductactivity class
            Intent i = new Intent(getApplicationContext(), NewProductActivity.class);
            startActivity(i);
            return true;

        default:
            return super.onOptionsItemSelected(item);

        }
    }

===================================================
now we have one option in option menu 
 import MenuItem Library also

Call Another Activity From one Activity in Android Development

to Open new activity or page
here is the android code to open new activity from one another activity

package com.one.click;//Package name
//libraries want to import
import android.R.string;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class MainScreenActivity extends Activity{
    
  //Declare a button
    Button btnNewProduct;
    
    //declare a layout which is want to open when this class called
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_screen);//here is the place to enter layout name
        
        // Buttons assign the id of the buton in our layout
        btnNewProduct = (Button) findViewById(R.id.btnCreateProduct);
      
        
        // here is the place show when click btnNewProduct    buton which class want to open              btnNewProduct.setOnClickListener(new View.OnClickListener() {
            
                       public void onClick(View view) {
                // Launching create new product activity
                Intent i = new Intent(getApplicationContext(), NewProductActivity.class);
                startActivity(i);
                
            }
        });
    }