In this blog we are inflating the menu by using inflate()method of the menuInflater class this can be performd event handling on menu items, when we need to override then we can used onOptionItemSelected()method of activity class. Hence using below code example you can make option menu function.

Step(1)- activity_main.xml

<RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    android:paddingBottom="@dimen/activity_vertical_margin"  
    android:paddingLeft="@dimen/activity_horizontal_margin"  
    android:paddingRight="@dimen/activity_horizontal_margin"  
    android:paddingTop="@dimen/activity_vertical_margin"  
    tools:context=".MainActivity" >  

    <TextView  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:text="@string/hello_world" />  

</RelativeLayout>  

Step(2)- menu_main.xml

<menu xmlns:androclass="http://schemas.android.com/apk/res/android" >  
    <item  android:id="@+id/item1"  
        android:title="Item 1"/>  
    <item  android:id="@+id/item2"  
        android:title="Item 2"/>  
    <item  android:id="@+id/item3"  
        android:title="Item 3"/>  
</menu> 

Step(3) Activity class-

public class MainActivity extends Activity {  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
    }  
    @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);//Menu Resource, Menu  
        return true;  
    }  
    @Override  
    public boolean onOptionsItemSelected(MenuItem item) {  
        switch (item.getItemId()) {  
            case R.id.item1:  
              Toast.makeText(getApplicationContext(),"Item 1 Selected",Toast.LENGTH_LONG).show();  
            return true;     
           case R.id.item2:  
                Toast.makeText(getApplicationContext(),"Item 2 Selected",Toast.LENGTH_LONG).show();  
              return true;     
            case R.id.item3:  
                Toast.makeText(getApplicationContext(),"Item 3 Selected",Toast.LENGTH_LONG).show();  
              return true;     
              default:  
                return super.onOptionsItemSelected(item);  
        }  
    }  
}