Implement checkable items in OptionsMenu of Toolbar

Example to implement checkable items in OptionsMenu of Toolbar, modify from last example"Set image on Toolbar".

Modify menu/menu_main.xml, to add checkable items:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/item_checkable1"
        android:orderInCategory="100"
        android:title="Checkable opt 1"
        android:checkable="true"
        android:checked="true"/>
    <item
        android:id="@+id/item_checkable2"
        android:orderInCategory="100"
        android:title="Checkable opt 2"
        android:checkable="true"
        android:checked="false"/>
    <item
        android:id="@+id/item_normal"
        android:orderInCategory="100"
        android:title="Normal item"/>

</menu>

Modify MainActivity.java, modify onOptionsItemSelected() to handle the item click.

package com.blogspot.android_er.androidtoolbar;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
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);
        Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        getSupportActionBar().setTitle("Toolbar example");
        toolbar.setSubtitle("Android-er.blogspot.com");
        toolbar.setLogo(android.R.drawable.ic_menu_info_details);
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        Toast.makeText(this, item.getTitle(), Toast.LENGTH_LONG).show();

        int item_id = item.getItemId();
        switch(item_id){
            case R.id.item_checkable1:
                if(item.isChecked()){
                    item.setChecked(false);
                }else{
                    item.setChecked(true);
                }
                break;
            case R.id.item_checkable2:
                if(item.isChecked()){
                    item.setChecked(false);
                }else{
                    item.setChecked(true);
                }
                break;
        }

        return super.onOptionsItemSelected(item);
    }
}

Next:
- Add button inside Toolbar