Android Many font in button

gistfile1.java

final SpannableString textVidOTW = new SpannableString(Html.fromHtml("Video<br/>OF THE WEEK"));
        textVidOTW.setSpan(new RelativeSizeSpan(0.7f*density), 0, 5, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        textVidOTW.setSpan(new TypefaceSpan(this, "fonts/Lighthouse_PersonalUse.ttf"), 0, 5,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        textVidOTW.setSpan(new RelativeSizeSpan(0.3f*density), 5, textVidOTW.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        
        
//and add class

public class TypefaceSpan extends MetricAffectingSpan {
/** An <code>LruCache</code> for previously loaded typefaces. */
private static LruCache<String, Typeface> sTypefaceCache = new LruCache<String, Typeface>(
        12);

private Typeface mTypeface;

/**
 * Load the {@link Typeface} and apply to a {@link Spannable}.
 */
public TypefaceSpan(Context context, String typefaceName) {
    mTypeface = sTypefaceCache.get(typefaceName);

    if (mTypeface == null) {
        mTypeface = Typeface.createFromAsset(context.getApplicationContext().getAssets(), 
                                             String.format("%s", typefaceName));

        // Cache the loaded Typeface
        sTypefaceCache.put(typefaceName, mTypeface);
    }
}

@Override
public void updateMeasureState(TextPaint p) {
    p.setTypeface(mTypeface);

    // Note: This flag is required for proper typeface rendering
    p.setFlags(p.getFlags() | Paint.SUBPIXEL_TEXT_FLAG);
}

@Override
public void updateDrawState(TextPaint tp) {
    tp.setTypeface(mTypeface);

    // Note: This flag is required for proper typeface rendering
    tp.setFlags(tp.getFlags() | Paint.SUBPIXEL_TEXT_FLAG);
}
}