Android example to create grouped sub OptionsMenu

Create menu/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<menu 
 >
 <item
 android_id="@+id/option1"
 android_orderInCategory="100"
 app_showAsAction="ifRoom"
 android_title="Option 1"/>
 <item
 android_id="@+id/option2"
 android_orderInCategory="100"
 app_showAsAction="never"
 android_title="Option 2"/>
 <item
 android_id="@+id/option3"
 android_orderInCategory="100"
 app_showAsAction="never"
 android_title="Option 3...">
 <menu >
 <group android_id="@+id/group3"
 android_checkableBehavior="single">
 <item android_id="@+id/submenu3a"
 android_title="SubMenu 3A" />
 <item android_id="@+id/submenu3b"
 android_title="SubMenu 3B" />
 </group>
 </menu>

 </item>
</menu>

MainActivity.java

package com.blogspot.android_er.androidoptionsmenu;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 getMenuInflater().inflate(R.menu.activity_main, menu);
 return super.onCreateOptionsMenu(menu);
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
 switch(item.getItemId()){
 case R.id.option1:
 Toast.makeText(MainActivity.this, "Option 1", Toast.LENGTH_LONG).show();
 return true;
 case R.id.option2:
 Toast.makeText(MainActivity.this, "Option 2", Toast.LENGTH_LONG).show();
 return true;
 case R.id.submenu3a:
 Toast.makeText(MainActivity.this, "Option 3 A", Toast.LENGTH_LONG).show();
 return true;
 case R.id.submenu3b:
 Toast.makeText(MainActivity.this, "Option 3 B", Toast.LENGTH_LONG).show();
 return true;
 }
 return super.onOptionsItemSelected(item);
 }
}

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