...Calligraphy is a library of custom fonts in Android an OK way. Add your custom fonts to assets/. All font definitions are relative to this path. Assuming that you are using Gradle you should create the assets directory under src/main/ in your project directory if it does not already exist. As it's popular to use multi-project build with Gradle the path is usually app/src/main/assets/, where app is the project name. You might consider creating a fonts/ subdirectory in the assets directory. Define your default font using CalligraphyConfig, in your Application class in the #onCreate() method and pass it to the CalligraphyInterceptor that you add to your ViewPump builder. ...