ALL TextView's typefaces, includes action bar and other standard components, but EditText's password font won't be overriden.

Reference URL : https://gist.github.com/artem-zinnatullin/7749076?signup=true

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

}

}

<?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>

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);

}

}

}