显示富文本图片

    private Handler mHandler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 1:
                    CharSequence charSequence = (CharSequence) msg.obj;
                    if (charSequence != null) {
                        contenttextview.setText(charSequence);
                  contenttextview.setMovementMethod(LinkMovementMethod.getInstance());
                    }
                    break;
                default:
                    break;
            }
        }
    };


    private void setActivityContent(final String activityContent) {
        new Thread(new Runnable() {

            @Override
            public void run() {
                Html.ImageGetter imageGetter = new Html.ImageGetter() {

                    @Override
                    public Drawable getDrawable(String source) {
                        Drawable drawable;
                        drawable = getImageNetwork(source);
                        if (drawable != null) {
                            drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight());
                        } else if (drawable == null) {
                            return null;
                        }
                        return drawable;
                    }
                };
                CharSequence charSequence = Html.fromHtml(activityContent.trim(), imageGetter, null);
                Message ms = Message.obtain();
                ms.what = 1;
                ms.obj = charSequence;
                mHandler.sendMessage(ms);
            }
        }).start();
    }



       public static Drawable getImageNetwork(String imageUrl) {
        URL myFileUrl = null;
        Drawable drawable = null;
        try {
            myFileUrl = new URL(imageUrl);
            HttpURLConnection conn = (HttpURLConnection) myFileUrl
                    .openConnection();
            conn.setDoInput(true);
            conn.connect();
            InputStream is = conn.getInputStream();
            // 在这一步最好先将图片进行压缩，避免消耗内存过多
            Bitmap bitmap = BitmapFactory.decodeStream(is);
            drawable = new BitmapDrawable(bitmap);
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return drawable;
    }