一、杂谈

微信分享图片的迷之bug，前一阵子接盘一个Hybrid App，分享要用原生的分享，搞了一阵子把微信分享搞上，测试又反馈了一个谜一样的Bug，我这边看Log打印了checkArgs fail, thumbData is invalid，google一番都说是图片不能超过32kb，在分享里面看到如下判断this.thumbData.length > '耀'，一时间没有反应过来。。。可是怎么压缩好哇，我参照官方Demo和AndroidUtilCode的按质量压缩方法，找出了下面的解决方案，供大家参考。

二、将网络图片加载到内存

保存到本地在操作真心感觉麻烦

  1. public static byte[] getHtmlByteArray(final String url) {
  2.     URL htmlUrl = null;
  3.     InputStream inStream = null;
  4.     try {
  5.         htmlUrl = new URL(url);
  6.         URLConnection connection = htmlUrl.openConnection();
  7.         HttpURLConnection httpConnection = (HttpURLConnection) connection;
  8.         int responseCode = httpConnection.getResponseCode();
  9.         if (responseCode == HttpURLConnection.HTTP_OK) {
  10.             inStream = httpConnection.getInputStream();
  11.         }
  12.     } catch (MalformedURLException e) {
  13.         e.printStackTrace();
  14.     } catch (IOException e) {
  15.         e.printStackTrace();
  16.     }
  17.     // 将io流转为byte数组
  18.     byte[] data = inputStreamToByte(inStream);
  19.     if (data.length > '耀') {
  21.         // 转换为bitmap
  22.         Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
  24.         // 获取压缩后的byte数组
  25.         data = compressByQuality(bitmap, '耀', true);
  26.     }
  27.     return data;
  28. }

三、将io流转为byte数组

  1. public static byte[] inputStreamToByte(InputStream is) {
  2.     try {
  3.         ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
  4.         int ch;
  5.         while ((ch = is.read()) != -1) {
  6.             bytestream.write(ch);
  7.         }
  8.         byte imgdata[] = bytestream.toByteArray();
  9.         bytestream.close();
  10.         return imgdata;
  11.     } catch (Exception e) {
  12.         e.printStackTrace();
  13.     }
  15.     return null;
  16. }

四、按质量压缩

  1. /**
  2.     * 按质量压缩图片
  3.     *
  4.     * @param src         bitmap图片
  5.     * @param maxByteSize 最大字节数
  6.     * @param recycle
  7.     * @return
  8.     */
  9. public static byte[] compressByQuality(final Bitmap src, final long maxByteSize, final boolean recycle) {
  10.     ByteArrayOutputStream baos = new ByteArrayOutputStream();
  11.     src.compress(CompressFormat.JPEG, 100, baos);
  12.     byte[] bytes;
  13.     if (baos.size() <= maxByteSize) {
  14.         bytes = baos.toByteArray();
  15.     } else {
  16.         baos.reset();
  17.         src.compress(CompressFormat.JPEG, 0, baos);
  18.         if (baos.size() >= maxByteSize) {
  19.             bytes = baos.toByteArray();
  20.         } else {
  21.             // find the best quality using binary search
  22.             int st = 0;
  23.             int end = 100;
  24.             int mid = 0;
  25.             while (st < end) {
  26.                 mid = (st + end) / 2;
  27.                 baos.reset();
  28.                 src.compress(CompressFormat.JPEG, mid, baos);
  29.                 int len = baos.size();
  30.                 if (len == maxByteSize) {
  31.                     break;
  32.                 } else if (len > maxByteSize) {
  33.                     end = mid - 1;
  34.                 } else {
  35.                     st = mid + 1;
  36.                 }
  37.             }
  38.             if (end == mid - 1) {
  39.                 baos.reset();
  40.                 src.compress(CompressFormat.JPEG, st, baos);
  41.             }
  42.             bytes = baos.toByteArray();
  43.         }
  44.     }
  45.     if (recycle && !src.isRecycled()) src.recycle();
  46.     return bytes;
  47. }

五、微信分享

  1. WXWebpageObject object = new WXWebpageObject();
  2. object.webpageUrl = url;
  3. WXMediaMessage wxMediaMessage = new WXMediaMessage(object);
  4. // 标题
  5. wxMediaMessage.title = title;
  6. // 描述
  7. wxMediaMessage.description = des.substring(0, 20);
  8. // 图片
  9. wxMediaMessage.thumbData = Util.getHtmlByteArray(image);
  10. //构造一个Req
  11. SendMessageToWX.Req req = new SendMessageToWX.Req();
  12. req.transaction = String.valueOf(System.currentTimeMillis());
  13. req.message = wxMediaMessage;
  14. req.scene = SendMessageToWX.Req.WXSceneSession;
  15. mIWXAPI.sendReq(req);

六、源码

WechatShareUtil类

https://github.com/sdwfqin/AndroidQuick