1，在AndroidStudio中新增依賴，點選calligraphy新增依賴

2.在application中初始化對應字型，下面以Roboto-RobotoRegular.ttf

@Override
public void onCreate() {
    super.onCreate();
    CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
                            .setDefaultFontPath("fonts/Roboto-RobotoRegular.ttf")
                            .setFontAttrId(R
 
.attr.fontPath)
                            .build()
            );
    //....
}

@Override
protected void attachBaseContext(Context newBase) {
    super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}

另外附上roboto字型大全下載地址，點選