Android connection Fonts?

Question

Android

Good afternoon, guys, how to connect fonts to the project, globally.
For example, connected in one place so that they apply to everyone?

Answer 1

public class FontChangeCrawler {
    private Typeface typeface;

    public FontChangeCrawler(Typeface typeface) {
        this.typeface = typeface;
    }

    public FontChangeCrawler(AssetManager assets, String assetsFontFileName) {
        typeface = Typeface.createFromAsset(assets, assetsFontFileName);
    }

    public void replaceFonts(ViewGroup viewTree) {
        View child;
        for (int i = 0; i < viewTree.getChildCount(); ++i) {
            child = viewTree.getChildAt(i);
            if (child instanceof ViewGroup) {
                replaceFonts((ViewGroup)child);
            }
            else if (child instanceof TextView) {
                ((TextView) child).setTypeface(typeface);
            }
        }
    }
}

public class MainActivity extends AppCompatActivity {
    @Override
    public void setContentView(View view) {
        super.setContentView(view);

        FontChangeCrawler fontChanger = new FontChangeCrawler(getAssets(), "fonts/myfont.otf");
        fontChanger.replaceFonts((ViewGroup)this.findViewById(android.R.id.content));
    }
}

Answer 2

Wait for Android O and support library 26.0.0 (beta1 is available), it is there in its normal form.
Or use the Calligraphy library.