缩略图和从ICS上的图库中挑选picasa图像

Question

E/MiniThumbFile( 1852): Got exception when reading magic, id = 5745625138093120418, disk full or mount read-only? class java.lang.IllegalArgumentException
W/MediaProvider(  540): original media doesn't exist or it's canceled.

  public void addImage(Uri uri, boolean local)
  {
     ContentResolver resolver = getContentResolver();
     Uri actualUri = uri;

     Log.d(TAG, "addImage: original uri: " + uri.toString());

     if(local) {
        try {
           List<String> uriPath = uri.getPathSegments();
           String contentUri = Media.insertImage(resolver, uri.getPath(), uriPath.get(uriPath.size()-1), new String());
           actualUri = Uri.parse(contentUri);
        }
        catch(java.io.FileNotFoundException ex) {
           Log.e(TAG, "FileNotFoundException: ");
           ex.printStackTrace();
        }
     }

     Log.d(TAG, "addImage: actual uri: " + actualUri.toString());

     List<String> uriPath = actualUri.getPathSegments();
     long imageId = Long.parseLong(uriPath.get(uriPath.size() -1));

     Bitmap thumb = Thumbnails.getThumbnail(resolver, imageId, Thumbnails.MINI_KIND, null);
     if(thumb == null) {
        Log.e(TAG, "Failed to get thumbnail for our image.");
        Toast toast = Toast.makeText(getApplicationContext(), "Failed to get thumbnail for image. Please try again.", Toast.LENGTH_SHORT);
        toast.show();
        return;
     }

     uris.add(uri);
     bmps.add(thumb);
     notifyDataSetChanged();
  }

当一张新照片添加到应用程序的照片“集合”中时，就会调用该方法。当已知是本地图像时（即：如果照片是从应用程序内部拍摄的，或者OnActivityResult的数据参数为空），则本地参数设置为true，我尝试从媒体内容提供商获取content：//uri，以便获得有效的图像id传递给Thumbnails.getThumbnail。该代码对于从相机应用程序（通过startActivityForResult）获取的图像以及存储在设备本地的图库中的图像都能正常工作。

我有点被难住了。