How to set custom font for a whole application in Android?

EDIT

uk.co.chrisjenx:calligraphy Lib is not more maintained for latest android version alternative is nowhttps://github.com/InflationX/Calligraphy

dependencies {    implementation 'io.github.inflationx:calligraphy3:3.1.1'    implementation 'io.github.inflationx:viewpump:2.0.3'}

Add your custom fonts to assets/

Usage

For default font

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.

@Overridepublic void onCreate() {    super.onCreate();    ViewPump.init(ViewPump.builder()        .addInterceptor(new CalligraphyInterceptor(                new CalligraphyConfig.Builder()                    .setDefaultFontPath("fonts/Roboto-RobotoRegular.ttf")                    .setFontAttrId(R.attr.fontPath)                    .build()))        .build());    //....}

Inject into Context: Wrap the Activity Context:

@Overrideprotected void attachBaseContext(Context newBase) {    super.attachBaseContext(ViewPumpContextWrapper.wrap(newBase));}

Custom Style

<style name="TextViewCustomFont">    <item name="fontPath">fonts/RobotoCondensed-Regular.ttf</item></style>

For Theme

<style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">    <item name="android:textViewStyle">@style/AppTheme.Widget.TextView</item></style><style name="AppTheme.Widget"/><style name="AppTheme.Widget.TextView" parent="android:Widget.Holo.Light.TextView">    <item name="fontPath">fonts/Roboto-ThinItalic.ttf</item></style>

Not more maintained by Developers Below Solution

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()                );            }        } 

You should have made on assets/ a "New Directory" "fonts" (see below), so in that code "your font path" should be "fonts/SourceSansPro-Regular.ttf". (It's just "fonts..." not "/fonts.." or "assets..")

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:

        <application           .           .           .           android:name=".App">

And it will change the whole activity to your font! it's simple and clean!

On Assets you should right-click New Directory, call it "fonts". In the finder put the .ttf font files in there.

Also dont forgot to add below two lines in attrs.xml,if you dont have attrs.xml file,create new file in values.xml

 <attr format="string" name="fontPath"/>     <item name="calligraphy_tag_id" type="id"/>

All I did was:

1: Added "new resource directory" to the RES folder, Selected RESOURCE TYPE as "font" from the drop-down given, named the new directory "font" and saved.

2: Added my "custom_font.ttf" to the FONT folder just created.

3: Added my custom font in the application base theme in STYLES.XML

DONE.

Write a class

public class MyApp extends Application{// Put the onCreate code as you obtained from the post link you reffered}

now next thing is in AndroidManifest.xml for the application tag give name for your application class. In this case it is MyApp

<applicationandroid:name=".MyApp"...>...</application>

So whenever the App is opened , onCreate method of MyApp class would be invoked , and the font would be set.

UpdatePut font file under assets/fonts/your_font_file.ttf

Put this line under onCreate method of your application class(MyApp)

TypefaceUtil.overrideFont(getApplicationContext(), "SERIF", "fonts/your_font_file.ttf");

Source File for TypefaceUtil

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) {        final Typeface customFontTypeface = Typeface.createFromAsset(context.getAssets(), customFontFileNameInAssets);        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            Map<String, Typeface> newMap = new HashMap<String, Typeface>();            newMap.put("serif", customFontTypeface);            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 defaultFontTypefaceField = Typeface.class.getDeclaredField(defaultFontNameToOverride);                defaultFontTypefaceField.setAccessible(true);                defaultFontTypefaceField.set(null, customFontTypeface);            } catch (Exception e) {                Log.e(TypefaceUtil.class.getSimpleName(), "Can not set custom font " + customFontFileNameInAssets + " instead of " + defaultFontNameToOverride);            }        }    }}

Now update your style.xml file

put the below line your style which is included for your activity in manifest file

  <item name="android:typeface">serif</item>

Hope this helps