How to implement an options menu for an Activity in an Android app

This video is on how to implement an options menu for an Activity in an Android app. like the video and subscribe to my youtube channel.
useful link

source code:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
}

@Override

String shareSub = "Your Subject Here";

}


}


}