If you need to set one font for all TextViews in android application you can use this solution. It will override ALL TextView's typefaces, includes action bar and other standard components, but EditText's password font won't be overriden.

MyApp.java

public class MyApp extends Application {
  
  @Override
  public void onCreate() {
    TypefaceUtil.overrideFont(getApplicationContext(), "SERIF", "fonts/Roboto-Regular.ttf"); // font from assets: "assets/fonts/Roboto-Regular.ttf
  }
}

themes.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <style name="MyAppTheme" parent="@android:style/Theme.Holo.Light">
    <!-- you should set typeface which you want to override with TypefaceUtil -->
    <item name="android:typeface">serif</item>
  </style>
</resources>

TypefaceUtil.java

import android.content.Context;
import android.graphics.Typeface;
import android.util.Log;

import java.lang.reflect.Field;

public class TypefaceUtil {

    /**
     * Using reflection to override default typeface
     * NOTICE: DO NOT FORGET TO SET TYPEFACE FOR APP THEME AS DEFAULT TYPEFACE WHICH WILL BE OVERRIDDEN
     * @param context to work with assets
     * @param defaultFontNameToOverride for example "monospace"
     * @param customFontFileNameInAssets file name of the font from assets
     */
    public static void overrideFont(Context context, String defaultFontNameToOverride, String customFontFileNameInAssets) {
        try {
            final Typeface customFontTypeface = Typeface.createFromAsset(context.getAssets(), customFontFileNameInAssets);

            final Field defaultFontTypefaceField = Typeface.class.getDeclaredField(defaultFontNameToOverride);
            defaultFontTypefaceField.setAccessible(true);
            defaultFontTypefaceField.set(null, customFontTypeface);
        } catch (Exception e) {
            Log.e("Can not set custom font " + customFontFileNameInAssets + " instead of " + defaultFontNameToOverride);
        }
    }
}

Where we have to put MyApp class.

Can you please show this example in working HelloWorld Application ?

oh my god! how it work!!! it still wow word but unfortunately do not work in api>21

Thaaaaaaaaaaaaaaaaaank youuuu soooooooooooooo muuuch

Wow That's cool

awesome, nice

is there a way to get this to work when android:textStyle="bold" is specified in the layout xml?

I'm sure this was a life saviour back in 2014 but now for API 26+ you can use this much easier solution 👍
https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml

https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml

Follow the steps mentioned in the link above.

Just need to add font_family="@fonts/font_type" for changing the font style for any textview or button edittext etc.

This is great, i created a kotlin version here https://gist.github.com/Johnyoat/040ca5224071d01b3f3dfc6cd4d026f7 using this solution

Thank you,its Amazing!

very nice, thank you

Works perfectly