How to add dividers between specific menu items?

Question

Background

I have a menu item in the action bar (toolbar actually) that when clicked, shows a list of items to choose from, similar to radio-buttons:

Answer 1

I did it this way:

Reference screenshot:

style.xml:

    <style name="popup" parent="Widget.AppCompat.ListView.DropDown">
            <item name="android:divider">@color/colorPrimary</item>
            <item name="android:dividerHeight">1dp</item>
            <item name="android:textColor">@color/colorPrimary</item>
            <item name="android:itemBackground">@android:color/white</item>
    </style>

 <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

        <!--- Customize popmenu -->
        <item name="android:dropDownListViewStyle">@style/popup</item>


    </style>

Java code:

private void showPopup(View v) {
        Context wrapper = new ContextThemeWrapper(this, R.style.popup);
        PopupMenu mypopupmenu = new PopupMenu(wrapper, v);
        MenuInflater inflater = mypopupmenu.getMenuInflater();
        inflater.inflate(R.menu.menu_patient_language, mypopupmenu.getMenu());
        mypopupmenu.show();
        mypopupmenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                txtPreferredLanguage.setText(item.getTitle().toString());
                switch (item.getItemId()) {
                    case R.id.menuEnglish:
                        // Your code goes here
                        break;

                    case R.id.menuFrench:
                        // Your code goes here
                        break;
                }
                return false;
            }
        });
    }

Hope this will help you.