项目开发中遇到了这样一个需求，标签（图片）和文字，标签显示在标题的开头，自然而然想到了用TextView+ImageSpan的方式来弄，开始没有思路，网上搜索一下基本上都有说到，但是都没有解决一个问题，就是居中。怎么设置都设置不了！后来找到一篇文章里面介绍了ImageSpan的getSize()方法设置了展示位置！下面给出自定义修改的ImageSpan，至于怎么用ImageSpan就不多说了

/**
 * 垂直居中的ImageSpan
 *
 * @author KenChung
 */
public class VerticalImageSpan extends ImageSpan {

    public VerticalImageSpan(Drawable drawable) {
        super(drawable);
    }

    public int getSize(Paint paint, CharSequence text, int start, int end,
                       Paint.FontMetricsInt fontMetricsInt) {
        Drawable drawable = getDrawable();
        Rect rect = drawable.getBounds();
        if (fontMetricsInt != null) {
            Paint.FontMetricsInt fmPaint = paint.getFontMetricsInt();
            int fontHeight = fmPaint.bottom - fmPaint.top;
            int drHeight = rect.bottom - rect.top;

            int top = drHeight / 2 - fontHeight / 4;
            int bottom = drHeight / 2 + fontHeight / 4;

            fontMetricsInt.ascent = -bottom;
            fontMetricsInt.top = -bottom;
            fontMetricsInt.bottom = top;
            fontMetricsInt.descent = top;
        }
        return rect.right;
    }

    @Override
    public void draw(Canvas canvas, CharSequence text, int start, int end,
                     float x, int top, int y, int bottom, Paint paint) {
        Drawable drawable = getDrawable();
        canvas.save();
        int transY = 0;
        transY = ((bottom - top) - drawable.getBounds().bottom) / 2 + top;
        canvas.translate(x, transY);
        drawable.draw(canvas);
        canvas.restore();
    }
}

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