Android - How to set a custom font for whole app [duplicate]

Answer 1

Cerate a TextView subclass and use it everywhere

    public class RobotoTextView extends TextView {

    public RobotoTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public RobotoTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public RobotoTextView(Context context) {
        super(context);
        init();
    }

    private void init() {
        if (!isInEditMode()) {
            Typeface tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/Roboto-Light.ttf");
            setTypeface(tf);
        }
    }

}

usage

in java code you can cast it to TextView