Android TextView图文混排时垂直对齐

解决办法查找至：https://segmentfault.com/a/1190000007133405

效果图如下:

效果图.png

关键代码

/**
     * 图文混排时，图片和文字都垂直居中显示
     */
    public static class CenterImageSpan extends ImageSpan {

        private WeakReference mDrawableRef;

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

        @Override 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.descent - fmPaint.ascent;
                int drHeight = rect.bottom - rect.top;
                int centerY = fmPaint.ascent + fontHeight / 2;

                fontMetricsInt.ascent = centerY - drHeight / 2;
                fontMetricsInt.top = fontMetricsInt.ascent;
                fontMetricsInt.bottom = centerY + drHeight / 2;
                fontMetricsInt.descent = fontMetricsInt.bottom;
            }
            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 = getCachedDrawable();
            canvas.save();
            Paint.FontMetricsInt fmPaint = paint.getFontMetricsInt();
            int fontHeight = fmPaint.descent - fmPaint.ascent;
            int centerY = y + fmPaint.descent - fontHeight / 2;
            int transY = centerY - (drawable.getBounds().bottom - drawable.getBounds().top) / 2;
            canvas.translate(x, transY);
            drawable.draw(canvas);
            canvas.restore();
        }

        private Drawable getCachedDrawable() {
            WeakReference wr = mDrawableRef;
            Drawable d = null;
            if (wr != null) {
                d = wr.get();
            }

            if (d == null) {
                d = getDrawable();
                mDrawableRef = new WeakReference<>(d);
            }

            return d;
        }
    }

具体使用：

SpannableString mSpannableString = new SpannableString(value);
CenterImageSpan span = new CenterImageSpan(d);
                mSpannableString.setSpan(span, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.setText(mSpannableString);