Question

在我的应用程序中，我编写了将文件上传到dropbox的代码。我成功地能够做到这一点。我想在上传文件时显示Progressbar。我在我的Asynctask类中实现了onProgressUpdate方法。但我是没有得到如何计算我将在doInBackground（）中的publishProgress方法传递的值。或者如何获取我将在发布进度方法中传递的值。我使用下面的代码，它是我的doInBackGround方法中DropBox API的一部分。

   File file = new File("working-draft.txt");
   FileInputStream inputStream = new FileInputStream(file);
   Entry response = mDBApi.putFile("/magnum-opus.txt", inputStream,
   file.length(), null, null); 
   Log.i("DbExampleLog", "The uploaded file's rev is: " + response.rev);

请提供您对上述查询的建议。谢谢：）

Answer 1

为时已晚，但肯定会帮助其他人现在，Dropbox API v2 Java SDK提供了用于上载和下载的进度侦听器。该版本已在v3.0.9中发布：

您可以通过以下方式使用ProgressListner：

dbxClient.files().uploadBuilder("/" + file.getName()) //Path in the user's Dropbox to save the file.
                .withMode(WriteMode.ADD)
                .uploadAndFinish(inputStream, new IOUtil.ProgressListener() {
                    @Override
                    public void onProgress(long bytesWritten) {
                        percentWritten =(bytesWritten/uploadFile.length())*100;      //Progress Percentage
                    }
                });

干杯。快乐编码

Answer 2

经过一些R＆amp; D，我终于得到了here.

的解决方案

我没有将null传递给putFile方法的最后一个参数，而是实现了Progress Listener并获得了通过onProgress方法传输的字节数值。

Thanx建议您的答案。：）

Answer 3

 public class uploadfile extends AsyncTask<Void, Integer, String>
    {

         private ProgressDialog dialog;
            protected Context mContext;
            long totalSize;

          public uploadfile(Context context) {

                mContext = context;
            }

         @Override
            protected void onPreExecute() {

                dialog = new ProgressDialog(mContext);
                dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                dialog.setTitle("Chance");
                dialog.setCancelable(false);
                //dialog.setIndeterminate(true);
                dialog.setMessage("uploading...");
                dialog.show();
                //dialog.setProgress(0);

            }


        @Override
        protected String doInBackground(Void... params) {


             HttpClient httpclient = new DefaultHttpClient();
             HttpContext httpContext = new BasicHttpContext();
             HttpPost httppost = new HttpPost("your url");
             StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
             StrictMode.setThreadPolicy( policy);
             String responseMessage = "";


            try {

                 CustomMultiPartEntity entity = new CustomMultiPartEntity(new ProgressListener() {
                     @Override
                     public void transferred(long num) {
                         publishProgress((int) ((num / (float) totalSize) * 100));
                     }
                 });




            //post request to send the file

            FileBody file1 = new FileBody(new File("path of file"));
            entity.addPart("file", file1);
            totalSize = entity.getContentLength();

            httppost.setEntity(entity);

            // DEBUG
            System.out.println( "executing request " + httppost.getRequestLine( ) );
            HttpResponse response = httpclient.execute(httppost, httpContext);
            responseMessage = EntityUtils.toString(response.getEntity());

            System.out.println( "Server response" + responseMessage );




            }
            catch (SocketTimeoutException e) {
                e.printStackTrace();
                responseMessage = "unreachable";

            }

            catch (ConnectTimeoutException e) {
                e.printStackTrace();
                responseMessage = "unreachable";

            }

            catch (Exception e) {
                e.printStackTrace();
                responseMessage = "unreachable";

            }

            return responseMessage;


        }


         @Override
            protected void onProgressUpdate(Integer... progress) {
                dialog.setProgress((int) (progress[0]));
            }

        protected void onPostExecute(String result) {

             //result is the response back from "doInBackground"
            dialog.cancel();


            //check if there were errors upoloading
            if (result.equalsIgnoreCase("unreachable")) {

                Toast.makeText(mContext, "Error while uploading...Please check your internet connection and retry", Toast.LENGTH_LONG).show();
                return;
            }

           if(result.equals("[\"uploaded\"]"))
           {
               Toast.makeText(mContext, "uploaded", Toast.LENGTH_LONG).show();
               finish();
           }




        }

    }

CustomMultiPartEntity.java

public class CustomMultiPartEntity extends MultipartEntity
   {

private final ProgressListener listener;

public CustomMultiPartEntity(final ProgressListener listener)
{
    super();
    this.listener = listener;
}

public CustomMultiPartEntity(final HttpMultipartMode mode, final ProgressListener listener)
{
    super(mode);
    this.listener = listener;
}

public CustomMultiPartEntity(HttpMultipartMode mode, final String boundary, final Charset charset, final ProgressListener listener)
{
    super(mode, boundary, charset);
    this.listener = listener;
}

@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);
    }
}
  }

通过publishProgress将文件上传到Dropbox时显示进度条

3 个答案: