Custom TextView/Button/ ------- Cache Font

CustomFontTextView

public class CustomFontTextView extends AppCompatTextView {
    private static final String ANDROID_SCHEMA = "http://schemas.android.com/apk/res/android";

    public CustomFontTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        applyCustomFont(context, attrs);
    }

    public CustomFontTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        applyCustomFont(context, attrs);
    }

    private Typeface selectTypeface(Context context, int style) {
        switch (style) {
            case Typeface.BOLD:
                return FontCache.getTypeface(context, Font.FIRASANS_BOLD);

            case Typeface.ITALIC:
                return FontCache.getTypeface(context, Font.FIRASANS_ITALIC);

            case Typeface.BOLD_ITALIC:
                return FontCache.getTypeface(context, Font.FIRASANS_BOLD_ITALIC);

            case Typeface.NORMAL:
            default:
                return FontCache.getTypeface(context, Font.FIRASANS);
        }
    }

    private void applyCustomFont(Context context, AttributeSet attrs) {
        int textStyle = attrs.getAttributeIntValue(ANDROID_SCHEMA, "textStyle", Typeface.NORMAL);
        Typeface customFont = selectTypeface(context, textStyle);
        setTypeface(customFont);
    }
}

Font

@Retention(RetentionPolicy.SOURCE)
@StringDef({
        FIRASANS,
        FIRASANS_BOLD,
        FIRASANS_BOLD_ITALIC,
        FIRASANS_ITALIC
})

public @interface Font {
    String FIRASANS = "MuseoSansRounded-300.otf";
    String FIRASANS_BOLD = "MuseoSansRounded-700.otf";
    String FIRASANS_ITALIC = "FiraSans-Italic.ttf";
    String FIRASANS_BOLD_ITALIC = "FiraSans-BoldItalic.ttf";
}

FontCache

public class FontCache {
    private static HashMap<String, Typeface> fontCache = new HashMap<>();

    public static Typeface getTypeface(Context context, @Font String fontName) {
        Typeface typeface = fontCache.get(fontName);
        if (typeface == null) {
            typeface = Typeface.createFromAsset(context.getAssets(), "fonts/" + fontName);
            fontCache.put(fontName, typeface);
        }
        return typeface;
    }
}