Android 关于微信分享图片过大失败的解决方案

android 关于微信分享图片过大失败的解决方案。这是因为微信对缩略图做了限制，最大不超过32k。

所以可以先通过图片加载工具获取bitmap，然后进行压缩，压缩方法如下：

//压缩图片
 public bitmap createbitmapthumbnail(bitmap bitmap) {
  int width = bitmap.getwidth();
  int height = bitmap.getheight();
  // 设置想要的大小
  int newwidth = 99;
  int newheight = 99;
  // 计算缩放比例
  float scalewidth = ((float) newwidth) / width;
  float scaleheight = ((float) newheight) / height;
  // 取得想要缩放的matrix参数
  matrix matrix = new matrix();
  matrix.postscale(scalewidth, scaleheight);
  // 得到新的图片
  bitmap newbitmap = bitmap.createbitmap(bitmap, 0, 0, width, height, matrix, true);
  return newbitmap;
 }

然后封装成umusic对象进行音频分享：

 final umusic music = new umusic(detail.path);//音频媒体对象
  umimage umimage = new umimage(mactivity, bitmap);//将缩略图封装成umimage对象，在设置给音频媒体对象
music.settitle(detail.name);
music.setthumb(umimage);
 new shareaction(mactivity).setplatform(media).setcallback(umsharelistener)//设置回调
 .withtitle(detail.name)//标题
 .withtext(getstring(r.string.share_text_pre) + detail.name + getstring(r.string.share_text_next))//描述信息
 .withmedia(umusic)//媒体对象
 .withtargeturl(url)//目标地址，就是点击分享要跳转的页面
 .share();

分享视频：

string url = postsharecontent(mainurl, detail);//url点击跳转页面地址
  umvideo image = new umvideo(url);
  image.settitle(detail.name);
  image.setthumb(detail.coverpath);//这里如果图片过大也应该和音频一样，
  log.log = false;
  new shareaction(mactivity).setplatform(media).setcallback(umsharelistener)
 .withtitle(detail.name)
 .withtext(getstring(r.string.share_text_pre) + detail.name + getstring(r.string.share_text_next))
 .withmedia(image)
// .withtargeturl(url)//地址封装在umvideo中，所以不必调用此方法
 .share();
  loggerutils.d(tag + "\n" + string.format(" 分享地址 ：%s \n 分享标题 ：%s \n 分享图标 ：%s \n 分享音频 ：%s",
 url,detail.name,detail.coverpath,detail.path));

分享图片：

  umimage image = new umimage(mactivity, detail.path);
  image.settitle(detail.name);
  image.setthumb(detail.coverpath);

  string url = postsharecontent(mainurl, detail);

  log.log = false;

//  config.istoasttip = true;

  new shareaction(mactivity).setplatform(media).setcallback(umsharelistener)
 .withtitle(detail.name)
 .withtext(getstring(r.string.share_text_pre) + detail.name + getstring(r.string.share_text_next))
 .withmedia(image)
 .withtargeturl(url)
 .share();

最后接口回调类：

 /**
  * 分享回调监听
  */
 private umsharelistener umsharelistener = new umsharelistener() {
  @override
  public void onresult(share_media platform) {
loggerutils.d("share result");
  }

  @override
  public void onerror(share_media platform, throwable t) {
if (t != null) {
 loggerutils.d(t.getmessage());
}
  }

  @override
  public void oncancel(share_media platform) {

loggerutils.d("share cancel");
  }
 };