How to change Custom Font of Android Menu Item?

Question

I have the following Android Java and XML code. I want to change the font of Menu Items of my app. I know only that we can change the font of TextView using setTypeface but

Answer 1

If your app only needs to work on Android Pie (API level 28) and above you can construct a TypefaceSpan from a Typeface in onPrepareOptionsMenu. Otherwise you can use a CustomTypefaceSpan class like this answer suggests:

public boolean onPrepareOptionsMenu(Menu menu) {
    int customFontId = R.font.metropolis_medium;
    for (int i = 0; i < menu.size(); i++) {
        MenuItem menuItem = menu.getItem(i);
        String menuTitle = menuItem.getTitle().toString();
        Typeface typeface = ResourcesCompat.getFont(this, customFontId);
        SpannableString spannableString = new SpannableString(menuTitle);
        // For demonstration purposes only, if you need to support < API 28 just use the CustomTypefaceSpan class only.
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.P) {
            TypefaceSpan typefaceSpan = typeface != null ?
                    new TypefaceSpan(typeface) :
                    new TypefaceSpan("sans-serif");
            spannableString.setSpan(typefaceSpan, 0, menuTitle.length(), 
                    Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
        } else {
            CustomTypefaceSpan customTypefaceSpan = typeface != null ?
                    new CustomTypefaceSpan(typeface) :
                    new CustomTypefaceSpan(Typeface.defaultFromStyle(Typeface.NORMAL));
            spannableString.setSpan(customTypefaceSpan, 0, menuTitle.length(),
                    Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
        }
        menuItem.setTitle(spannableString);
    }
    return true;
}

main.menu.xml:

Before & After: