Android Apache - 上传并跟踪进度

Question

我正在尝试使用https +帖子上传图片，并跟踪其进度。

  StringEntity strEntity = null; 
      int totalSize = 0; 

      try 
      { 
       strEntity = new StringEntity(jsonBody.toString(), HTTP.UTF_8); 
       strEntity.setContentEncoding(HTTP.UTF_8); 
       strEntity.setContentType("application/json"); 
       totalSize = jsonBody.toString().getBytes().length; 
      } 
      catch (UnsupportedEncodingException e) 
      { 
       e.printStackTrace(); 
      } 

      ProgressHttpEntityWrapper httpEntity = new ProgressHttpEntityWrapper(strEntity, progressCallback, totalSize); 
      httpPost.setEntity(httpEntity); 

我发现这里是我的类扩展HttpEntityWrapper

public class ProgressHttpEntityWrapper extends HttpEntityWrapper 
{ 
    private final ProgressCallback progressCallback; 
    private final long fileSize; 

    public ProgressHttpEntityWrapper(final HttpEntity entity, final ProgressCallback progressCallback, int fileSize) 
    { 
     super(entity); 
     this.progressCallback = progressCallback; 
     this.fileSize = fileSize; 

     Log.e("AsyncUploadData", "Constructor"); 
    } 

    @Override 
    public void writeTo(final OutputStream out) throws IOException 
    { 
     Log.e("AsyncUploadData", "writeTo: " +getContentLength()); 

     super.writeTo(out instanceof ProgressFilterOutputStream ? out 
       : new ProgressFilterOutputStream(out, this.progressCallback, this.fileSize)); 
    } 
    ..... 
} 

然而，我发现我的 “的writeTo” 方法总是被调用两次。 我想不通为什么！请帮忙！

是否有可能与我的服务器有关？ 感谢您的帮助！

Answer 1

您的writeTo()方法正在调用this.wrappedEntity.writeTo()，我认为这是多余的。

我用这样的一个时间：

@Override 
public void writeTo(final OutputStream outstream) throws IOException { 
    super.writeTo(new CountingOutputStream(outstream, this.listener)); 
} 

public static interface ProgressListener { 
    void transferred(long num); 
} 

public static class CountingOutputStream extends FilterOutputStream { 

    private final ProgressListener listener; 
    private long transferred; 

    public CountingOutputStream(final OutputStream out, final ProgressListener listener) { 
     super(out); 
     this.listener = listener; 
     this.transferred = 0; 
    } 

    public void write(byte[] b, int off, int len) throws IOException { 
     out.write(b, off, len); 
     this.transferred += len; 
     this.listener.transferred(this.transferred); 
    } 

    public void write(int b) throws IOException { 
     out.write(b); 
     this.transferred++; 
     this.listener.transferred(this.transferred); 
    } 
} 

所有学分转到：http://toolongdidntread.com/android/android-multipart-post-with-progress-bar/