If you need to set one font for all TextViews in android application you can use this solution. It will override ALL TextView's typefaces, includes action bar and other standard components, but EditText's password font won't be overriden.

MyApp.java

public class MyApp extends Application {
  
  @Override
  public void onCreate() {
    TypefaceUtil.overrideFont(getApplicationContext(), "SERIF", "fonts/Roboto-Regular.ttf"); // font from assets: "assets/fonts/Roboto-Regular.ttf
  }
}

themes.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <style name="MyAppTheme" parent="@android:style/Theme.Holo.Light">
    <!-- you should set typeface which you want to override with TypefaceUtil -->
    <item name="android:typeface">serif</item>
  </style>
</resources>

TypefaceUtil.java

import android.content.Context;
import android.graphics.Typeface;
import android.util.Log;

import java.lang.reflect.Field;

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) {
        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) {
            Log.e("Can not set custom font " + customFontFileNameInAssets + " instead of " + defaultFontNameToOverride);
        }
    }
}

Awesome

Wow, very nice.

Nice and simple. Thanks!

Does it work on all Android versions?

Awesome!

awesome! solved my long time problem with Typeface!

thx!

Doesn't work if font-size is specified.

It's working perfectly fine... (Y).. thanks...

Thank you, It's works fine in Arabic text, all over the app.

Awesome

cool feint ears!

Wow nice one :)

wow..thank you so much.. :)

thanks alot , you saved me

Thanks a lot ,what is the minimum android version your class will support?Is Ice cream Sandwich?

where to put themes.xml file..?in which folder..?

Thank A Lot... Good Work... :)

I wander that is not working over 5.0

Thank A Lot.

I know for android 5 (api > 21) we should add an values-v21 style but nothing change. can some one help me?

my values-21 -> style.xml

< style name="AppBaseTheme" parent="Theme.AppCompat.Light.DarkActionBar" >
< / style>
< style name="AppTheme" parent="AppBaseTheme" >
< item name="android:typeface">serif< / item>
< / style>

I asked the question on stackoverflow and found the answer (for api >= 21 the older solution doesn't work): http://stackoverflow.com/questions/31218795/changing-all-typefaces-of-an-android-application/31219701#31219701

The second answer worked for me

works like a charm!

this is perfect and help me so much.... thank you... thank you .... thank you

does this work on L projects using app compat? coz i can't seem to see the difference :(

How to set for DEFAULT and DEFAULT_BOLD both?

Thank you so much. Awesome. So many thanks to you

Thank you, I like this way of setting a custom font for the entire app !

How do you make this work for Lollipop and above?

This looks much better than finding all the views and changing their typeface everytime a new Activity is created. Thanks a lot!

I'd love to try this solution. I have source code for an app written by someone else and I need to change the font. I'm new to android development. Where do I add these three files and how do I get the app to actually execute this code?

It works fine. Is there a way to apply it to the textviews that are bold or italic?

hey friend, i try this solution but cant override serif font.so font change but display serif font so something wrong at use of myapp file.
any one tell me how to solve it.
and when is use or declare myapp file.
help me....

thanks, i love u <3

It works for me... Thanks :)

how can we revert back to default.

I am doing something like this:
if(configShared.getString("storeId", AppCredentials.DEFAULT_STORE_ID).equals("2")){
final Field staticField = Typeface.class.getDeclaredField(staticTypefaceFieldName);
staticField.setAccessible(true);
staticField.set(null, newTypeface);
}
else{
final Field staticField = Typeface.class.getDeclaredField(staticTypefaceFieldName);
staticField.setAccessible(true);
staticField.set(null, null);
}

kudos.. great one

It's working fine for me awesome.

This font not supported for DialogFragment class

I used it with Jameel noori nastaleeq font for Urdu. Loving it!

**

great really helpful

**

Wow awesome answer. Thanks a lot

After a long time of tries,..Finally. Its worked, thanks.

How to set type face in style.xml
e.g: ?????????

where & how to use myapp.java ??

Nice.. All of the font are nicely replaced but Toolbar title cannot change? How could I change it?

Can you please show this example in working HelloWorld Application ?

You are a lifesaver, thank you

To change EditText's password font:
Create CustomTextInput and CustomEditText inside the package called "components" and then use it into layout:

CustomTextInput example:

public class CustomTextInput extends TextInputLayout{
    private Typeface faceLight;

    public CustomTextInput(Context context) {
        super(context);
        setFont(context);
    }

    public CustomTextInput(Context context, AttributeSet set) {
        super(context, set);
        setFont(context);
    }

    public CustomTextInput(Context context, AttributeSet set, int defaultStyle) {
        super(context, set, defaultStyle);
        setFont(context);
    }

    private void setFont(Context context) {
        faceLight = Typeface.createFromAsset(context.getApplicationContext().getAssets(), Constants.faceLightPath);
        setTypeface(faceLight);
    }

}

activity_login.xml example:

        <components.CustomTextInput
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:layout_marginTop="30dp"
            >

            <components.CustomEditText
                android:id="@+id/input_password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Password"
                android:inputType="textPassword" />
        </components.CustomTextInput>

What to replace the qustion mark. kindly advice me. I have a font file named myfont.otf

public class TypefaceUtil {

public static void overrideFont(Context context, String momospace, String ?? ) {
    try {
        final Typeface customFontTypeface = Typeface.createFromAsset(context.getAssets(), "myfont.otf");

        final Field defaultFontTypefaceField = Typeface.class.getDeclaredField(momospace);
        defaultFontTypefaceField.setAccessible(true);
        defaultFontTypefaceField.set(null, customFontTypeface);
    } catch (Exception e) {

    }
}

}

Thanks and it worked. I didnt know that the default typefaces that could be overwritten are predefined but I could realize it soon. Thanks again

@boopathikumar018: You can avoid that variable and change the definition of overrideFont method and change the function calling appropriately, like overrideFont(getApplicationContext(), "SERIF") in the application subclass.
Or you could follow the example as mentioned above and replace the ?? with customFontFileNameInAssets and replace myfont.otf in the try block with the customFontFileNameInAssets.

is the text inside button also gets changed with this?

@rustyJ4ck not working in some devices like samsung s4

How to add punjabi or hindi language in listview

How to override sans-serif-medium (or light)?

Thanks a lot.

thanx man it worked.

there is an step missing "android:name=".MyApp" add this to your Menifiest file under Application.

absolutely brilliant hats off, away some. i don't have word to say.

you are awesome

awesome

don't work in api > 21

Simply Awesome

NOT WORKING WITH API >21

very brilliant logic,, your are god,,, you save time of lot of people... Thanks :)

2018 and does not work with API>21

Better way of doing that is to create custom text/input field with custom fonts like:

`public class RegularProximaTextView extends TextView {
public static Typeface FONT_NAME;

public RegularProximaTextView(Context context) {
super(context);
if(FONT_NAME == null) FONT_NAME = Typeface.createFromAsset(context.getAssets(), "fonts/Mark Simonson - Proxima Nova Regular.otf");
this.setTypeface(FONT_NAME);
}
public RegularProximaTextView(Context context, AttributeSet attrs) {
super(context, attrs);
if(FONT_NAME == null) FONT_NAME = Typeface.createFromAsset(context.getAssets(), "fonts/Mark Simonson - Proxima Nova Regular.otf");
this.setTypeface(FONT_NAME);
}
public RegularProximaTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
if(FONT_NAME == null) FONT_NAME = Typeface.createFromAsset(context.getAssets(), "fonts/Mark Simonson - Proxima Nova Regular.otf");
this.setTypeface(FONT_NAME);
}`

I just used this and still works. thank you :D

Where we have to put MyApp class.

Can you please show this example in working HelloWorld Application ?

oh my god! how it work!!! it still wow word but unfortunately do not work in api>21

Thaaaaaaaaaaaaaaaaaank youuuu soooooooooooooo muuuch

Wow That's cool

awesome, nice

is there a way to get this to work when android:textStyle="bold" is specified in the layout xml?

I'm sure this was a life saviour back in 2014 but now for API 26+ you can use this much easier solution 👍
https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml

https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml

Follow the steps mentioned in the link above.

Just need to add font_family="@fonts/font_type" for changing the font style for any textview or button edittext etc.

This is great, i created a kotlin version here https://gist.github.com/Johnyoat/040ca5224071d01b3f3dfc6cd4d026f7 using this solution

Thank you,its Amazing!

very nice, thank you