TextView垂直方向位置Span

public class VerticalAlignmentSpan extends MetricAffectingSpan {
    double ratio = 0.5;

    public VerticalAlignmentSpan() {
    }

    public VerticalAlignmentSpan(double ratio) {
        this.ratio = ratio;
    }

    @Override
    public void updateDrawState(TextPaint paint) {
        paint.baselineShift += (int) (paint.ascent() * ratio);
    }

    @Override
    public void updateMeasureState(TextPaint paint) {
        paint.baselineShift += (int) (paint.ascent() * ratio);
    }
}

转载请指明出处RobinBlog：http://robinx.net/2018/08/30/TextView垂直方向位置Span/