Android Custom Fonts Custom font to whole activity

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public class ReplaceFont {

public static void changeDefaultFont(Context context, String oldFont, String assetsFont) {
    Typeface typeface = Typeface.createFromAsset(context.getAssets(), assetsFont);
    replaceFont(oldFont, typeface);

private static void replaceFont(String oldFont, Typeface typeface) {
    try {
        Field myField = Typeface.class.getDeclaredField(oldFont);
        myField.set(null, typeface);
    } catch (NoSuchFieldException e) {
    } catch (IllegalAccessException e) {

Then in your activity, in onCreate() method:

// Put your font to assets folder...

ReplaceFont.changeDefaultFont(getApplication(), "DEFAULT", "LinLibertine.ttf");

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