How to set default font family for entire Android app

Question

I m using the Roboto light font in my app  To set the font I ve to add the android fontFamily  sans-serif-light  to every view  Is there any way to declare the Roboto font as default font family to entire app  I ve tried like this but it didn t seem to work    lt style name  AppBaseTheme  parent  android Theme Light  gt  lt  style gt    lt style name  AppTheme  parent  AppBaseTheme  gt       lt item name  android fontFamily  gt sans-serif-light lt  item gt   lt  style gt

User · Answer

This is how we do it  private static void OverrideDefaultFont string defaultFontNameToOverride  string customFontFileNameInAssets  AssetManager assets          Load custom Font from File                     Typeface customFontTypeface   Typeface CreateFromAsset assets  customFontFileNameInAssets          Get Fontface Default Field by reflection     Class typeFaceClass   Class ForName  quot android graphics Typeface quot        Field defaultFontTypefaceField   typeFaceClass GetField defaultFontNameToOverride        defaultFontTypefaceField Accessible   true      defaultFontTypefaceField Set null  customFontTypeface

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READ UPDATES BELOW  I had the same issue with embedding a new font and finally got it to work with extending the TextView and set the typefont inside   public class YourTextView extends TextView        public YourTextView Context context  AttributeSet attrs  int defStyle            super context  attrs  defStyle           init               public YourTextView Context context  AttributeSet attrs            super context  attrs           init               public YourTextView Context context            super context           init               private void init             Typeface tf   Typeface createFromAsset context getAssets                 fonts helveticaneue ttf            setTypeface tf             You have to change the TextView Elements later to from  to  in every element  And if you use the UI-Creator in Eclipse  sometimes he doesn t show the TextViews right  Was the only thing which work for me     UPDATE  Nowadays I m using reflection to change typefaces in whole application without extending TextViews  Check out this SO post  UPDATE 2  Starting with API Level 26 and available in  support library  you can use   android fontFamily   font embeddedfont    Further information  Fonts in XML

User · Answer

The answer is no  you can t   See Is it possible to set a custom font for entire of application  for more information    There are workarounds  but nothing in the lines of  one single line of code here and all my fonts will be this instead of that     I kind of thank Google -and Apple- for that   Custom fonts have a place  but making them easy to replace app wide  would have created an entire world of Comic Sans applications

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Just use this lib compile it in your grade file   complie me anwarshahriar calligrapher 1 0    and use it in the onCreate method in the main activity   Calligrapher calligrapher   new Calligrapher this   calligrapher setFont this   yourCustomFontHere ttf   true     This is the most elegant super fast way to do that

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to merely set typeface of app to normal  sans  serif or monospace not to a custom font    you can do this   define a theme and set the android typeface attribute to the typeface you want to use in styles xml    lt resources gt        lt  -- custom normal activity theme -- gt       lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt           lt item name  colorPrimary  gt  color colorPrimary lt  item gt           lt item name  colorPrimaryDark  gt  color colorPrimaryDark lt  item gt           lt item name  colorAccent  gt  color colorAccent lt  item gt           lt  -- other elements -- gt           lt item name  android typeface  gt monospace lt  item gt       lt  style gt    lt  resources gt    apply the theme to the whole app in the AndroidManifest xml file    lt  xml version  1 0  encoding  utf-8   gt   lt manifest      gt       lt application         android theme   style AppTheme   gt       lt  application gt   lt  manifest gt    android reference

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Android does not provide much in the way of support for applying fonts across the whole app  see this issue    You have 4 options to set the font for the entire app    Option1   Apply reflection to change the system font  Option2   Create and subclass custom View classes for each View that needs a custom font  Option3   Implement a View Crawler which traverses the view hierarchy for the current screen  Option4  Use a 3rd party library    Details of these options can be found here

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The answer is yes   Global Roboto light for TextView and Button classes    lt style name  AppTheme  parent  AppBaseTheme  gt       lt item name  android textViewStyle  gt  style RobotoTextViewStyle lt  item gt       lt item name  android buttonStyle  gt  style RobotoButtonStyle lt  item gt   lt  style gt    lt style name  RobotoTextViewStyle  parent  android Widget TextView  gt       lt item name  android fontFamily  gt sans-serif-light lt  item gt   lt  style gt    lt style name  RobotoButtonStyle  parent  android Widget Holo Button  gt       lt item name  android fontFamily  gt sans-serif-light lt  item gt   lt  style gt    Just select the style you want from list themes xml  then create your custom style based on the original one  At the end  apply the style as the theme of the application    lt application     android theme   style AppTheme   gt   lt  application gt    It will work only with built-in fonts like Roboto  but that was the question  For custom fonts  loaded from assets for example  this method will not work   EDIT 08 13 15  If you re using AppCompat themes  remember to remove android  prefix  For example    lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt       lt item name  android textViewStyle  gt  style RobotoTextViewStyle lt  item gt       lt item name  buttonStyle  gt  style RobotoButtonStyle lt  item gt   lt  style gt    Note the buttonStyle doesn t contain android  prefix  but textViewStyle must contain it

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I know this question is quite old  but I have found a nice solution  Basically  you pass a container layout to this function  and it will apply the font to all supported views  and recursively cicle in child layouts   public static void setFont ViewGroup layout        final int childcount   layout getChildCount        for  int i   0  i  lt  childcount  i                     Get the view         View v   layout getChildAt i               Apply the font to a possible TextView         try                 TextView  v  setTypeface MY CUSTOM FONT               continue                    catch  Exception e                  Apply the font to a possible EditText         try                 TextView  v  setTypeface MY CUSTOM FONT               continue                    catch  Exception e                  Recursively cicle into a possible child layout         try               ViewGroup vg    ViewGroup  v              Utility setFont vg               continue                    catch  Exception e

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This is work for my project  source https   gist github com artem-zinnatullin 7749076  Create fonts directory inside Asset Folder and then copy your custom font to fonts directory  example I am using trebuchet ttf   Create a class TypefaceUtil java   import android content Context  import android graphics Typeface  import android util Log   import java lang reflect Field  public class TypefaceUtil        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                         Edit theme in styles xml add below   lt item name  android typeface  gt serif lt  item gt    Example in My styles xml   lt resources gt        lt  -- Base application theme  -- gt       lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt           lt  -- Customize your theme here  -- gt           lt item name  colorPrimary  gt  color colorPrimary lt  item gt           lt item name  colorPrimaryDark  gt  color colorPrimaryDark lt  item gt           lt item name  colorAccent  gt  color colorAccent lt  item gt           lt item name  android typeface  gt serif lt  item gt  lt  -- Add here -- gt       lt  style gt         lt style name  AppTheme NoActionBar  gt           lt item name  windowActionBar  gt false lt  item gt           lt item name  windowNoTitle  gt true lt  item gt           lt item name  android windowActionBarOverlay  gt true lt  item gt           lt item name  android windowFullscreen  gt true lt  item gt       lt  style gt   lt  resources gt    Finally  in Activity or Fragment onCreate call TypefaceUtil java   Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           TypefaceUtil overrideFont getContext     SERIF    fonts trebuchet ttf

User · Answer

To change your app font follow the following steps   Inside res directory create a new directory and name it font  Insert your font  ttf  otf inside the font folder  Make sure the font name is lower case letters and underscore only  Inside res - gt  values - gt  styles xml inside  lt resources gt  - gt   lt style gt  add your font  lt item name  quot android fontFamily quot  gt  font font name lt  item gt     Now all your app text should be in the font that you add

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Another way to do this for the whole app is using reflection based on this answer   public class TypefaceUtil                  Using reflection to override default typefaces        NOTICE  DO NOT FORGET TO SET TYPEFACE FOR APP THEME AS DEFAULT TYPEFACE WHICH WILL BE        OVERRIDDEN                param typefaces map of fonts to replace             public static void overrideFonts Map lt String  Typeface gt  typefaces            try               final Field field   Typeface class getDeclaredField  sSystemFontMap                field setAccessible true               Map lt String  Typeface gt  oldFonts    Map lt String  Typeface gt   field get null               if  oldFonts    null                    oldFonts putAll typefaces                 else                   oldFonts   typefaces                            field set null  oldFonts               field setAccessible false             catch  Exception e                Log e  TypefaceUtil    Can not set custom fonts                         public static Typeface getTypeface int fontType  Context context               here you can load the Typeface from asset or use default ones         switch  fontType                case BOLD                  return Typeface create SANS SERIF  Typeface BOLD               case ITALIC                  return Typeface create SANS SERIF  Typeface ITALIC               case BOLD ITALIC                  return Typeface create SANS SERIF  Typeface BOLD ITALIC               case LIGHT                  return Typeface create SANS SERIF LIGHT  Typeface NORMAL               case CONDENSED                  return Typeface create SANS SERIF CONDENSED  Typeface NORMAL               case THIN                  return Typeface create SANS SERIF MEDIUM  Typeface NORMAL               case MEDIUM                  return Typeface create SANS SERIF THIN  Typeface NORMAL               case REGULAR              default                  return Typeface create SANS SERIF  Typeface NORMAL                       then whenever you want to override the fonts you can just call the method and give it a map of typefaces as follows   Typeface regular   TypefaceUtil getTypeface REGULAR  context   Typeface light   TypefaceUtil getTypeface REGULAR  context   Typeface condensed   TypefaceUtil getTypeface CONDENSED  context   Typeface thin   TypefaceUtil getTypeface THIN  context   Typeface medium   TypefaceUtil getTypeface MEDIUM  context   Map lt String  Typeface gt  fonts   new HashMap lt  gt     fonts put  sans-serif   regular   fonts put  sans-serif-light   light   fonts put  sans-serif-condensed   condensed   fonts put  sans-serif-thin   thin   fonts put  sans-serif-medium   medium   TypefaceUtil overrideFonts fonts     for full example check   This only works for Android SDK 21 and above for earlier versions check the full example

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With the release of Android Oreo you can use the support library to reach this goal    Check in your app build gradle if you have the support library    26 0 0 Add  font  folder to your resources folder and add your fonts there Reference your default font family in your app main style    lt style name  AppTheme  parent  Theme AppCompat Light NoActionBar  gt      lt item name  android fontFamily  gt  font your font lt  item gt      lt item name  fontFamily  gt  font your font lt  item gt   lt  -- target android sdk versions  lt  26 and  gt  14 if theme other than AppCompat -- gt   lt  style gt     Check https   developer android com guide topics ui look-and-feel fonts-in-xml html for more detailed information

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Not talk about performance  for custom font you can have a recursive method loop through all the views and set typeface if it s a TextView   public class Font       public static void setAllTextView ViewGroup parent            for  int i   parent getChildCount   - 1  i  gt   0  i--                final View child   parent getChildAt i               if  child instanceof ViewGroup                    setAllTextView  ViewGroup  child                 else if  child instanceof TextView                      TextView  child  setTypeface getFont                                        public static Typeface getFont             return Typeface createFromAsset YourApplicationContext getInstance   getAssets     fonts whateverfont ttf              In all your activity  pass current ViewGroup to it after setContentView and it s done   ViewGroup group    ViewGroup  getWindow   getDecorView   findViewById android R id content   Font setAllTextView group     For fragment you can do something similar

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Add this line of code in your res value styles xml   lt item name  android fontFamily  gt  font circular medium lt  item gt    the entire style will look like that   lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt       lt  -- Customize your theme here  -- gt       lt item name  colorPrimary  gt  color colorPrimary lt  item gt       lt item name  colorPrimaryDark  gt  color colorPrimaryDark lt  item gt       lt item name  colorAccent  gt  color colorAccent lt  item gt       lt item name  android fontFamily  gt  font circular medium lt  item gt   lt  style gt    change  circular medium  to your own font name

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Try this library  its lightweight and easy to implement  https   github com sunnag7 FontStyler   lt com sunnag fontstyler FontStylerView               android textStyle  bold                android text   string about us                android layout width  match parent                android layout height  match parent                android paddingTop  8dp                app fontName  Lato-Bold                android textSize  18sp                android id    id textView64    gt

[android] How to set default font family for entire Android app

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