Is it possible to set a custom font for entire of application

Question

I need to use certain font for my entire application  I have  ttf file for the same  Is it possible to set this as default font  at application start up and then use it elsewhere in the application  When set  how do I use it in my layout XMLs

User · Answer

I found the mixture of calligraphy 3 library and coderwall s post as my ultimate result

User · Answer

There is a great library for custom fonts in android Calligraphy  here is a sample how to use it    in Gradle you need to put this line into your app s build gradle file   dependencies       compile  uk co chrisjenx calligraphy 2 2 0      and then make a class that extends Application and write this code   public class App extends Application        Override     public void onCreate             super onCreate             CalligraphyConfig initDefault new CalligraphyConfig Builder                            setDefaultFontPath  your font path                            setFontAttrId R attr fontPath                           build                         and in the activity class put this method before onCreate    Override protected void attachBaseContext Context newBase        super attachBaseContext CalligraphyContextWrapper wrap newBase        and the last thing your manifest file should look like this    lt application                   android name   App  gt    and it will change the whole activity to your font  it s simple and clean

User · Answer

Calligraphy works pretty well  but it is not suitable for me  since it does not support different weights  bold  italic  etc  for a font-family   So I tried Fontain  which allows you to define custom Views and apply them custom font families   in order to use Fontain  you should add the following to your app module build gradle   compile  com scopely fontain 1 0 0    Then  instead of using regular TextView  you should use FontTextView  Example of FontTextView with uppercase and bold content     lt com scopely fontain views FontTextView             android layout width  match parent              android layout height  wrap content              android background   android color black              android textColor   android color white              android textSize  11dp              android gravity  center              android id    id tv1              app font family  myCustomFont              app caps mode  characters              app font weight  BOLD   gt

User · Answer

For changing default font family of the TextViews  override textViewStyle in your app theme   For using custom font in fontFamily  use font resources which is in support library    The feature was added in Android 26 but backported to older versions via supportlib   https   developer android com guide topics resources font-resource html https   developer android com guide topics ui look-and-feel fonts-in-xml html using-support-lib

User · Answer

I would suggest extending TextView  and always using your custom TextView within your XML layouts or wherever you need a TextView  In your custom TextView  override setTypeface   Override public void setTypeface Typeface tf  int style          to handle bold  you could also handle italic or other styles here as well     if  style    1           tf   Typeface createFromAsset getContext   getApplicationContext   getAssets     MuseoSans700 otf         else          tf   Typeface createFromAsset getContext   getApplicationContext   getAssets     MuseoSans500 otf              super setTypeface tf  0

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package com theeasylearn demo designdemo  import android content Context  import android graphics Typeface  import android util AttributeSet  import android widget TextView   public class MyButton extends TextView        public MyButton Context context  AttributeSet attrs  int defStyle            super context  attrs  defStyle           init               public MyButton Context context  AttributeSet attrs            super context  attrs           init               public MyButton Context context            super context           init               private void init                  Typeface tf                       Typeface createFromAsset                              getContext   getAssets     angelina TTF                setTypeface tf

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Working for Xamarin Android   Class   public class FontsOverride       public static void SetDefaultFont Context context  string staticTypefaceFieldName  string fontAssetName                Typeface regular   Typeface CreateFromAsset context Assets  fontAssetName           ReplaceFont staticTypefaceFieldName  regular              protected static void ReplaceFont string staticTypefaceFieldName  Typeface newTypeface                try                       Field staticField     Java Lang Object  newTypeface   Class GetDeclaredField staticTypefaceFieldName               staticField Accessible   true              staticField Set null  newTypeface                     catch  Exception e                        Console WriteLine e Message                       Application Implementation   namespace SomeAndroidApplication        Application      public class App   Application               public App                                 public App IntPtr handle  JniHandleOwnership transfer                base handle  transfer                                public override void OnCreate                         base OnCreate                 FontsOverride SetDefaultFont this   MONOSPACE    fonts Roboto-Light ttf                        Style    lt style name  Theme Storehouse  parent  Theme Sherlock  gt       lt item name  android typeface  gt monospace lt  item gt   lt  style gt

User · Answer

Yes with reflection  This works  based on this answer     Note  this is a workaround due to lack of support for custom fonts  so if you want to change this situation please do star to up-vote the android issue here   Note  Do not leave  me too  comments on that issue  everyone who has stared it gets an email when you do that  So just  star  it please   import java lang reflect Field  import android content Context  import android graphics Typeface   public final class FontsOverride        public static void setDefaultFont Context context              String staticTypefaceFieldName  String fontAssetName            final Typeface regular   Typeface createFromAsset context getAssets                    fontAssetName           replaceFont staticTypefaceFieldName  regular              protected static void replaceFont String staticTypefaceFieldName              final Typeface newTypeface            try               final Field staticField   Typeface class                      getDeclaredField staticTypefaceFieldName               staticField setAccessible true               staticField set null  newTypeface             catch  NoSuchFieldException e                e printStackTrace              catch  IllegalAccessException e                e printStackTrace                        You then need to overload the few default fonts  for example in an application class   public final class Application extends android app Application        Override     public void onCreate             super onCreate            FontsOverride setDefaultFont this   DEFAULT    MyFontAsset ttf            FontsOverride setDefaultFont this   MONOSPACE    MyFontAsset2 ttf            FontsOverride setDefaultFont this   SERIF    MyFontAsset3 ttf            FontsOverride setDefaultFont this   SANS SERIF    MyFontAsset4 ttf              Or course if you are using the same font file  you can improve on this to load it just once   However I tend to just override one  say  MONOSPACE   then set up a style to force that font typeface application wide    lt resources gt       lt style name  AppBaseTheme  parent  android Theme Light  gt       lt  style gt        lt  -- Application theme  -- gt       lt style name  AppTheme  parent  AppBaseTheme  gt           lt item name  android typeface  gt monospace lt  item gt       lt  style gt   lt  resources gt    API 21 Android 5 0  I ve investigated the reports in the comments that it doesn t work and it appears to be incompatible with the theme android Theme Material Light   If that theme is not important to you  use an older theme  e g     lt style name  AppTheme  parent  android Theme Holo Light DarkActionBar  gt       lt item name  android typeface  gt monospace lt  item gt   lt  style gt

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I would like to improve weston s answer for API 21 Android 5 0   Cause  Under API 21  most of the text styles include fontFamily setting  like    lt style name  TextAppearance Material  gt        lt item name  fontFamily  gt  string font family body 1 material lt  item gt   lt  style gt    Which applys the default Roboto Regular font    lt string name  font family body 1 material  gt sans-serif lt  string gt    The original answer fails to apply monospace font  because android fontFamily has greater priority to android typeface attribute  reference    Using Theme Holo   is a valid workaround  because there is no android fontFamily settings inside   Solution  Since Android 5 0 put system typeface in static variable Typeface sSystemFontMap  reference   we can use the same reflection technique to replace it   protected static void replaceFont String staticTypefaceFieldName          final Typeface newTypeface        if  isVersionGreaterOrEqualToLollipop              Map lt String  Typeface gt  newMap   new HashMap lt String  Typeface gt             newMap put  sans-serif   newTypeface           try               final Field staticField   Typeface class                      getDeclaredField  sSystemFontMap                staticField setAccessible true               staticField set null  newMap             catch  NoSuchFieldException e                e printStackTrace              catch  IllegalAccessException e                e printStackTrace                    else           try               final Field staticField   Typeface class                      getDeclaredField staticTypefaceFieldName               staticField setAccessible true               staticField set null  newTypeface             catch  NoSuchFieldException e                e printStackTrace              catch  IllegalAccessException e                e printStackTrace

User · Answer

Since the release of Android Oreo and its support library  26 0 0  you can do this easily  Refer to this answer in another question   Basically your final style will look like this    lt style name  AppTheme  parent  Theme AppCompat Light NoActionBar  gt      lt item name  fontFamily  gt  font your font lt  item gt   lt  -- target android sdk versions  lt  26 and  gt  14 -- gt   lt  style gt

User · Answer

its very simple    1 Download and put ur custom font in assets  then write one separate class for text view as follows   here i used futura font  public class CusFntTextView extends TextView    public CusFntTextView Context context  AttributeSet attrs  int defStyle        super context  attrs  defStyle       init       public CusFntTextView Context context  AttributeSet attrs        super context  attrs       init       public CusFntTextView Context context        super context       init       private void init         if   isInEditMode              Typeface tf   Typeface createFromAsset getContext   getAssets     Futura ttf            setTypeface tf                and do the following in xml      lt com packagename CusFntTextView         android id    id tvtitle          android layout width  wrap content          android layout height  wrap content                   android text  Hi Android                     android textAppearance   android attr textAppearanceLarge          gt

User · Answer

in api 26 with build gradle 3 0 0 and higher you can create a font directory in res and use this line in your style   lt item name  android fontFamily  gt  font your font lt  item gt    for change build gradle use this in your build gradle dependecies  classpath  com android tools build gradle 3 0 0

User · Answer

I would also like to improve weston s answer for API 21 Android 5 0   I had the same issue on my Samsung s5  when using DEFAULT font   with the others fonts it s working fine   I managed to make it working by setting the typeface   sans  for example  in XML files  for each Textview or Button   lt TextView android layout width  match parent  android layout height  39dp  android textColor   color abs  background holo light  android textSize  12sp  android gravity  bottom center  android typeface  sans    gt    and in MyApplication Class    public class MyApplication extends Application        Override     public void onCreate         TypefaceUtil overrideFont getApplicationContext     SANS SERIF        fonts my font ttf              Hope it helps

User · Answer

As of Android O this is now possible to define directly from the XML and my bug is now closed   See here for details  TL DR   First you must add your fonts to the project  Second you add a font family  like so    lt  xml version  1 0  encoding  utf-8   gt   lt font-family xmlns android  http   schemas android com apk res android  gt       lt font         android fontStyle  normal          android fontWeight  400          android font   font lobster regular    gt       lt font         android fontStyle  italic          android fontWeight  400          android font   font lobster italic    gt   lt  font-family gt    Finally  you can use the font in a layout or style    lt TextView         android layout width  wrap content          android layout height  wrap content          android fontFamily   font lobster   gt    lt style name  customfontstyle  parent   android style TextAppearance Small  gt       lt item name  android fontFamily  gt  font lobster lt  item gt   lt  style gt    Enjoy

User · Answer

A brilliant solution can be found here  https   coderwall com p qxxmaa android-use-a-custom-font-everywhere   Simply extend activities from BaseActivity and write those methods  Also you should better cache fonts as described here  https   stackoverflow com a 16902532 2914140     After some research I wrote code that works at Samsung Galaxy Tab A  Android 5 0   Used code of weston and Roger Huang as well as https   stackoverflow com a 33236102 2914140  Also tested on Lenovo TAB 2 A10-70L  where it doesn t work  I inserted a font  Comic Sans  here in order to see a difference   import android content Context  import android graphics Typeface  import android os Build  import android util Log  import java lang reflect Field  import java util HashMap  import java util Map   public class FontsOverride       private static final int BOLD   1      private static final int BOLD ITALIC   2      private static final int ITALIC   3      private static final int LIGHT   4      private static final int CONDENSED   5      private static final int THIN   6      private static final int MEDIUM   7      private static final int REGULAR   8       private Context context       public FontsOverride Context context            this context   context             public void loadFonts             Map lt String  Typeface gt  fontsMap   new HashMap lt  gt             fontsMap put  sans-serif   getTypeface  comic ttf   REGULAR            fontsMap put  sans-serif-bold   getTypeface  comic ttf   BOLD            fontsMap put  sans-serif-italic   getTypeface  comic ttf   ITALIC            fontsMap put  sans-serif-light   getTypeface  comic ttf   LIGHT            fontsMap put  sans-serif-condensed   getTypeface  comic ttf   CONDENSED            fontsMap put  sans-serif-thin   getTypeface  comic ttf   THIN            fontsMap put  sans-serif-medium   getTypeface  comic ttf   MEDIUM            overrideFonts fontsMap              private void overrideFonts Map lt String  Typeface gt  typefaces            if  Build VERSION SDK INT    21                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    Cannot set custom fonts                            else               try                   for  Map Entry lt String  Typeface gt  entry   typefaces entrySet                          final Field staticField   Typeface class getDeclaredField entry getKey                         staticField setAccessible true                       staticField set null  entry getValue                                     catch  NoSuchFieldException e                    e printStackTrace                  catch  IllegalAccessException e                    e printStackTrace                                       private Typeface getTypeface String fontFileName  int fontType            final Typeface tf   Typeface createFromAsset context getAssets     fonts     fontFileName           return Typeface create tf  fontType             To run the code in entire application you should write in some class like Application the following       new FontsOverride this  loadFonts      Create a folder  fonts  inside  assets  and put needed fonts there  A simple instruction may be found here  https   stackoverflow com a 31697103 2914140   The Lenovo device also incorrectly gets a value of a typeface  In most times it returns Typeface NORMAL  sometimes null  Even if a TextView is bold  in xml-file layout   See here  TextView isBold always returns NORMAL  This way a text on a screen is always in a regural font  not bold or italic  So I think it s a bug of a producer

User · Answer

I would like to improve weston s and Roger Huang s answers for over API 21 Android lollipop with theme  Theme AppCompat    Below Android 4 4   lt resources gt       lt style name  AppBaseTheme  parent  Theme AppCompat Light  gt       lt  style gt       lt  -- Application theme  -- gt      lt style name  AppTheme  parent  AppBaseTheme  gt          lt item name  android typeface  gt monospace lt  item gt      lt  style gt   lt  resources gt    Over equal  API 5 0   lt resources gt       lt style name  AppBaseTheme  parent  Theme AppCompat Light  gt       lt  style gt       lt  -- Application theme  -- gt      lt style name  AppTheme  parent  AppBaseTheme  gt          lt item name  android textAppearance  gt  style CustomTextAppearance lt  item gt      lt  style gt       lt style name  CustomTextAppearance  gt          lt item name  android typeface  gt monospace lt  item gt      lt  style gt   lt  resources gt    And the FontsOverride util file is same as what in weston s answer   I have tested in these phones   Nexus 5 android 5 1 Primary Android System    ZTE V5 android 5 1 CM12 1    XIAOMI note android 4 4 MIUI6   HUAWEI C8850 android 2 3 5 UNKNOWN

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This solution does not work correctly in some situations  So I extend it   FontsReplacer java  public class MyApplication extends Application         Override     public void onCreate             FontsReplacer replaceFonts this           super onCreate               https   gist github com orwir 6df839e3527647adc2d56bfadfaad805

User · Answer

Tom s solution works great  but only works with TextView and EditText   If you want to cover most of the views  RadioGroup  TextView  Checkbox      I created a method doing that     protected void changeChildrenFont ViewGroup v  Typeface font       for int i   0  i  lt  v getChildCount    i                 For the ViewGroup  we ll have to use recursivity         if v getChildAt i  instanceof ViewGroup               changeChildrenFont  ViewGroup  v getChildAt i   font                     else              try                   Object   nullArgs   null                    Test wether setTypeface and getTypeface methods exists                 Method methodTypeFace   v getChildAt i  getClass   getMethod  setTypeface   new Class    Typeface class  Integer TYPE                      With getTypefaca we ll get back the style  Bold  Italic     set in XML                 Method methodGetTypeFace   v getChildAt i  getClass   getMethod  getTypeface   new Class                        Typeface typeFace     Typeface methodGetTypeFace invoke v getChildAt i   nullArgs                      Invoke the method and apply the new font with the defined style to the view if the method exists  textview                      methodTypeFace invoke v getChildAt i   new Object    font  typeFace    null   0   typeFace getStyle                                  Will catch the view with no such methods  listview                 catch  Exception e                    e printStackTrace                                      This method will get back the style of the view set in XML  bold  italic     and apply them if they exists    For the ListView  I always create an adapter  and I set the font inside getView

User · Answer

I wrote a class assigning typeface to the views in the current view hierarchy and based os the current typeface properties  bold  normal  you can add other styles if you want    public final class TypefaceAssigner    public final Typeface DEFAULT  public final Typeface DEFAULT BOLD    Inject public TypefaceAssigner AssetManager assetManager        DEFAULT   Typeface createFromAsset assetManager   TradeGothicLTCom ttf        DEFAULT BOLD   Typeface createFromAsset assetManager   TradeGothicLTCom-Bd2 ttf       public void assignTypeface View v        if  v instanceof ViewGroup            for  int i   0  i  lt    ViewGroup  v  getChildCount    i                  View view     ViewGroup  v  getChildAt i               if  view instanceof ViewGroup                    setTypeface view                 else                   setTypeface view                                 else           setTypeface v            private void setTypeface View view        if  view instanceof TextView            TextView textView    TextView  view          Typeface typeface   textView getTypeface            if  typeface    null  amp  amp  typeface isBold                  textView setTypeface DEFAULT BOLD             else               textView setTypeface DEFAULT                         Now in all fragments in onViewCreated or onCreateView  in all activities in onCreate and in all view adapters in getView or newView just invoke   typefaceAssigner assignTypeface view

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You can set custom fonts for every layout one by one  with just one function call from every layout by passing its root View First  create a singelton approach for accessing font object like this    public class Font       private static Font font      public Typeface ROBO LIGHT       private Font                 public static Font getInstance Context context            if  font    null                font   new Font                font init context                     return font              public void init Context context             ROBO LIGHT   Typeface createFromAsset context getAssets                     Roboto-Light ttf               You can define different fonts in above class  Now Define a font Helper class that will apply fonts        public class FontHelper        private static Font font       public static void applyFont View parentView  Context context             font   Font getInstance context            apply  ViewGroup parentView               private static void apply ViewGroup parentView            for  int i   0  i  lt  parentView getChildCount    i                   View view   parentView getChildAt i      You can add any view element here on which you want to apply font               if  view instanceof EditText                       EditText  view  setTypeface font ROBO LIGHT                              if  view instanceof TextView                       TextView  view  setTypeface font ROBO LIGHT                               else if  view instanceof ViewGroup                      amp  amp    ViewGroup  view  getChildCount    gt  0                    apply  ViewGroup  view                                        In the above code  I am applying fonts on textView and EditText only   you can apply fonts on other view elements as well similarly You just need to pass the id of your root View group to the above apply font method  for example your layout is     lt RelativeLayout xmlns android  http   schemas android com apk res android      xmlns tools  http   schemas android com tools      android layout width  match parent      android layout height  match parent      android orientation  vertical      android id    id mainParent      tools context    relativePackage    activityClass    gt        lt RelativeLayout         android id    id mainContainer          android layout width  match parent          android layout height  wrap content          android layout above    id homeFooter          android layout below    id edit   gt            lt ImageView             android id    id PreviewImg              android layout width  match parent              android layout height  match parent              android src   drawable abc list longpressed holo              android visibility  gone    gt            lt RelativeLayout             android id    id visibilityLayer              android layout width  match parent              android layout height  fill parent   gt                lt ImageView                 android id    id UseCamera                  android layout width  wrap content                  android layout height  wrap content                  android layout alignParentTop  true                  android layout centerHorizontal  true                  android src   drawable camera    gt                lt TextView                 android id    id tvOR                  android layout width  wrap content                  android layout height  wrap content                  android layout below    id UseCamera                  android layout centerHorizontal  true                  android layout marginTop  20dp                  android text  OR                  android textSize  30dp    gt                lt TextView                 android id    id tvAND                  android layout width  wrap content                  android layout height  wrap content                  android layout centerHorizontal  true                  android layout marginTop  20dp                  android text  OR                  android textSize  30dp    gt    lt  RelativeLayout gt    In the Above Layout the root parent id is  Main Parent   now lets apply font   public class MainActivity extends BaseFragmentActivity        private EditText etName      private EditText etPassword      private TextView tvTitle      public static boolean isHome   false        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           Font font Font getInstance getApplicationContext             FontHelper applyFont findViewById R id mainParent            getApplicationContext                  Cheers

User · Answer

In summary   Option 1   Use reflection to apply font  combining weston  amp  Roger Huang s answer    import java lang reflect Field  import android content Context  import android graphics Typeface   public final class FontsOverride         public static void setDefaultFont Context context              String staticTypefaceFieldName  String fontAssetName            final Typeface regular   Typeface createFromAsset context getAssets                    fontAssetName           replaceFont staticTypefaceFieldName  regular               protected static void replaceFont String staticTypefaceFieldName final Typeface newTypeface            if  isVersionGreaterOrEqualToLollipop                  Map lt String  Typeface gt  newMap   new HashMap lt String  Typeface gt                 newMap put  sans-serif   newTypeface               try                   final Field staticField   Typeface class getDeclaredField  sSystemFontMap                    staticField setAccessible true                   staticField set null  newMap                 catch  NoSuchFieldException e                    e printStackTrace                  catch  IllegalAccessException e                    e printStackTrace                            else               try                   final Field staticField   Typeface class getDeclaredField staticTypefaceFieldName                   staticField setAccessible true                   staticField set null  newTypeface                 catch  NoSuchFieldException e                    e printStackTrace                  catch  IllegalAccessException e                    e printStackTrace                                         Usage in Application class   public final class Application extends android app Application        Override      public void onCreate              super onCreate             FontsOverride setDefaultFont this   DEFAULT    MyFontAsset ttf            FontsOverride setDefaultFont this   MONOSPACE    MyFontAsset2 ttf            FontsOverride setDefaultFont this   SERIF    MyFontAsset3 ttf            FontsOverride setDefaultFont this   SANS SERIF    MyFontAsset4 ttf                set up a style to force that font typeface application wide  based on lovefish    Pre-Lollipop    lt resources gt       lt style name  AppBaseTheme  parent  Theme AppCompat Light  gt       lt  style gt       lt  -- Application theme  -- gt      lt style name  AppTheme  parent  AppBaseTheme  gt          lt item name  android typeface  gt monospace lt  item gt      lt  style gt   lt  resources gt    Lollipop  API 21     lt resources gt       lt style name  AppBaseTheme  parent  Theme AppCompat Light  gt       lt  style gt       lt  -- Application theme  -- gt      lt style name  AppTheme  parent  AppBaseTheme  gt          lt item name  android textAppearance  gt  style CustomTextAppearance lt  item gt      lt  style gt       lt style name  CustomTextAppearance  gt          lt item name  android typeface  gt monospace lt  item gt      lt  style gt   lt  resources gt    Option2    Subclass each and every View where you need to customize font  ie  ListView  EditTextView  Button  etc   Palani s answer    public class CustomFontView extends TextView    public CustomFontView Context context  AttributeSet attrs  int defStyle        super context  attrs  defStyle       init         public CustomFontView Context context  AttributeSet attrs        super context  attrs       init         public CustomFontView Context context        super context       init         private void init          if   isInEditMode              Typeface tf   Typeface createFromAsset getContext   getAssets     Futura ttf            setTypeface tf               Option 3    Implement a View Crawler that traverses through the view hierarchy of your current screen   Variation 1  Tom s answer    public static final void setAppFont ViewGroup mContainer  Typeface mFont  boolean reflect         if  mContainer    null    mFont    null  return       final int mCount   mContainer getChildCount            Loop through all of the children       for  int i   0  i  lt  mCount    i                 final View mChild   mContainer getChildAt i           if  mChild instanceof TextView                            Set the font if it is a TextView                 TextView  mChild  setTypeface mFont                      else if  mChild instanceof ViewGroup                            Recursively attempt another ViewGroup               setAppFont  ViewGroup  mChild  mFont                      else if  reflect                         try                    Method mSetTypeface   mChild getClass   getMethod  setTypeface   Typeface class                   mSetTypeface invoke mChild  mFont                  catch  Exception e       Do something                                Usage    final ViewGroup mContainer    ViewGroup  findViewById  android R id content  getRootView    HomeActivity setAppFont mContainer  Typeface createFromAsset getAssets     fonts MyFont ttf       Variation 2    https   coderwall com p qxxmaa android-use-a-custom-font-everywhere   Option  4   Use 3rd Party Lib called Calligraphy   Personally  I would recommend Option 4  as it saves a lot of headaches

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I would also suggest extending TextView and other controls  but it would be better I consider to set up font in constructs   public FontTextView Context context        super context       init       public FontTextView Context context  AttributeSet attrs        super context  attrs       init       public FontTextView Context context  AttributeSet attrs  int defStyle        super context  attrs  defStyle       init       protected void init         setTypeface Typeface createFromAsset getContext   getAssets    AppConst FONT

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Yes  its possible to set the font to the entire application   The easiest way to accomplish this is to package the desired font s  with your application    To do this  simply create an assets   folder in the project root  and put your fonts  in  TrueType  or TTF  form  in the assets    You might  for example  create assets fonts   and put your TTF files in there   public class FontSampler extends Activity    Override public void onCreate Bundle icicle    super onCreate icicle   setContentView R layout main   TextView tv  TextView findViewById R id custom    Typeface face Typeface createFromAsset getAssets     fonts HandmadeTypewriter ttf    tv setTypeface face

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Finally  Google realized the severity of this problem  applying custom font to UI components  and they devised a clean solution for it   First  you need to update to support library 26   you may also need to update your gradle 4 0    android studio   then you can create a new resource folder called font  In this folder  you can put your font resources   tff       Then you need to override the default app them and force your custom font into it      lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt       lt item name  android fontFamily  gt  font my custom font lt  item gt   lt  style gt    Note  if you want to support devices with older API than 16  you have to use app namespace instead of android

User · Answer

While this would not work for an entire application  it would work for an Activity and could be re-used for any other Activity  I ve updated my code thanks to  FR073N to support other Views  I m not sure about issues with Buttons  RadioGroups  etc  because those classes all extend TextView so they should work just fine  I added a boolean conditional for using reflection because it seems very hackish and might notably compromise performance   Note  as pointed out  this will not work for dynamic content  For that  it s possible to call this method with say an onCreateView or getView method  but requires additional effort          Recursively sets a   link Typeface  to all      link TextView s in a   link ViewGroup       public static final void setAppFont ViewGroup mContainer  Typeface mFont  boolean reflect        if  mContainer    null    mFont    null  return       final int mCount   mContainer getChildCount            Loop through all of the children      for  int i   0  i  lt  mCount    i                final View mChild   mContainer getChildAt i           if  mChild instanceof TextView                           Set the font if it is a TextView                TextView  mChild  setTypeface mFont                     else if  mChild instanceof ViewGroup                           Recursively attempt another ViewGroup              setAppFont  ViewGroup  mChild  mFont                     else if  reflect                        try                   Method mSetTypeface   mChild getClass   getMethod  setTypeface   Typeface class                   mSetTypeface invoke mChild  mFont                  catch  Exception e       Do something                             Then to use it you would do something like this   final Typeface mFont   Typeface createFromAsset getAssets     fonts MyFont ttf     final ViewGroup mContainer    ViewGroup  findViewById  android R id content  getRootView    HomeActivity setAppFont mContainer  mFont     Hope that helps

[java] Is it possible to set a custom font for entire of application?

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