VerticalCenterSpan.java

package net.asamaru.test;

import android.graphics.Canvas;
import android.graphics.Paint;
import android.text.style.ReplacementSpan;

public class VerticalCenterSpan extends ReplacementSpan {
	public VerticalCenterSpan() {
	}

	@Override
	public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {
		int yPos = (int) ((canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2));
		canvas.drawText(text, start, end, x, yPos, paint);
	}

	@Override
	public int getSize(Paint paint, CharSequence text, int start, int end, Paint.FontMetricsInt fm) {
		return Math.round(paint.measureText(text, start, end));
	}
}