How to make RelativeSizeSpan align to top

Question

I have the following String RM123.456. I would like to

• Make RM relatively smaller
• Make RM aligned to to

Answer 1

Class for top align which should be used instead of RelativeSizeSpan (not in additional to):

import android.text.TextPaint;
import android.text.style.MetricAffectingSpan;

public class TopRelativeSizeSpan extends MetricAffectingSpan {

    private final float mProportion;

    public TopRelativeSizeSpan(float proportion) {
        mProportion = proportion;
    }

    @Override
    public void updateDrawState(TextPaint ds) {
        ds.baselineShift += (mProportion - 1) * (ds.getTextSize() - ds.descent());
        ds.setTextSize(ds.getTextSize() * mProportion);
    }

    @Override
    public void updateMeasureState(TextPaint ds) {
        updateDrawState(ds);
    }
}

And usage:

spannableString.setSpan(new TopRelativeSizeSpan(0.50f), 0, index, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString, TextView.BufferType.SPANNABLE);