检查进度上传＆下载（谷歌云端硬盘API适用于Android或Java）(Check progress

如何检查使用Google云端硬盘API上传的进展如何？

该service.files（）插入（身体，mediaContent）.execute（）; 只有返回，我们可以检查文件是否已经完全上传文件 。

但我需要实时检查进度（至少每秒左右），反正办呢？

而对于下载的一部分，我想我们可以手动比较多少字节，我们已经从InputStream总文件大小阅读，然后计算出当前的进度。

但是，这是正确的方法是什么？ 或者有检查进步的其他更好的办法？

private void saveFileToDrive() {
    Thread t = new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          // File's binary content
          java.io.File fileContent = new java.io.File(fileUri.getPath());
          FileContent mediaContent = new FileContent("image/jpeg", fileContent);

          // File's metadata.
          File body = new File();
          body.setTitle(fileContent.getName());
          body.setMimeType("image/jpeg");

          File file = service.files().insert(body, mediaContent).execute();
          if (file != null) {
            showToast("Photo uploaded: " + file.getTitle());
            //startCameraIntent();
          }
        } catch (UserRecoverableAuthIOException e) {
          startActivityForResult(e.getIntent(), REQUEST_AUTHORIZATION);
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    });
    t.start();
  }

编辑：使用此代码http://code.google.com/p/google-api-java-client/source/browse/drive-cmdline-sample/src/main/java/com/google/api/services/samples /drive/cmdline/DriveSample.java?repo=samples&name=based-on-1.12&r=08555cd2a27be66dc97505e15c60853f47d84b5a

我能得到一些进步，现在如果我使用可恢复上传 ，设置CHUNKSIZE为1MB。 但也有2个问题了。

1）继续上传比单个上传慢得多，因为它阻止很多次之间，每次只能发送1MB。
如果我设置CHUNKSIZE较高，那么它不会显示进度在所有的小文件。
所以，可恢复上传进度是不是我真正想要的。 我想在单上传进度。

2）如果我设置CHUNKSIZE 1MB左右，我上传总是失败在70％左右为正常的10MB文件。
如果我设置CHUNKSIZE为10MB，然后它会成功，但我不会看到任何进展。

Drive.Files.Insert insert = service.files().insert(body, mediaContent);
MediaHttpUploader uploader = insert.getMediaHttpUploader();
uploader.setDirectUploadEnabled(false);
uploader.setChunkSize(10*1024*1024); // previously I am using 1000000 thats why it won't work
uploader.setProgressListener(new FileUploadProgressListener());
com.google.api.services.drive.model.File f = insert.execute();

logcat的错误：

11-27 19:23:26.927: D/FileUploadProgressListener(11527): Upload is In Progress: 0.5235538030501893
11-27 19:23:33.692: D/FileUploadProgressListener(11527): Upload is In Progress: 0.56095050326806
11-27 19:23:38.294: D/FileUploadProgressListener(11527): Upload is In Progress: 0.5983472034859306
11-27 19:23:50.583: D/FileUploadProgressListener(11527): Upload is In Progress: 0.6357439037038013
11-27 19:23:55.091: D/FileUploadProgressListener(11527): Upload is In Progress: 0.673140603921672
11-27 19:24:05.130: D/FileUploadProgressListener(11527): Upload is In Progress: 0.7105373041395426
11-27 19:24:17.005: D/FileUploadProgressListener(11527): Upload is In Progress: 0.7479340043574133
11-27 19:24:28.888: D/FileUploadProgressListener(11527): Upload is In Progress: 0.785330704575284
11-27 19:24:28.896: W/HttpTransport(11527): exception thrown while executing request
11-27 19:24:28.896: W/HttpTransport(11527): java.io.IOException: unexpected end of stream
11-27 19:24:28.896: W/HttpTransport(11527):     at libcore.net.http.FixedLengthOutputStream.close(FixedLengthOutputStream.java:58)
11-27 19:24:28.896: W/HttpTransport(11527):     at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:88)
11-27 19:24:28.896: W/HttpTransport(11527):     at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:980)
11-27 19:24:28.896: W/HttpTransport(11527):     at com.google.api.client.googleapis.media.MediaHttpUploader.upload(MediaHttpUploader.java:293)
11-27 19:24:28.896: W/HttpTransport(11527):     at com.google.api.services.drive.Drive$Files$Insert.executeUnparsed(Drive.java:309)
11-27 19:24:28.896: W/HttpTransport(11527):     at com.google.api.services.drive.Drive$Files$Insert.execute(Drive.java:331)

Answer 1:

进展监听器：

private class FileUploadProgressListener implements MediaHttpUploaderProgressListener {

    private String mFileUploadedName;

    public FileUploadProgressListener(String fileName) {
        mFileUploadedName = fileName;
    }

    @Override
    public void progressChanged(MediaHttpUploader mediaHttpUploader) throws IOException {
        if (mediaHttpUploader == null) return;
        switch (mediaHttpUploader.getUploadState()) {
            case INITIATION_STARTED:
            //System.out.println("Initiation has started!");
                break;
            case INITIATION_COMPLETE:
            //System.out.println("Initiation is complete!");
                break;
            case MEDIA_IN_PROGRESS:
                double percent = mediaHttpUploader.getProgress() * 100;
                if (Ln.DEBUG) {
                    Log.d(Ln.TAG, "Upload to Dropbox: " + mFileUploadedName + " - " + String.valueOf(percent) + "%");
                }
                notif.setProgress(percent, mFileUploadedName).fire();
                break;
            case MEDIA_COMPLETE:
            //System.out.println("Upload is complete!");
        }
    }
}

这里更多信息： https://code.google.com/p/google-api-java-client/wiki/MediaUpload

直接媒体上传会上传整个媒体内容在一个请求 ，而不是可恢复媒体上传协议，可以在多个请求上传。

做一个直接上传减少HTTP请求的数量，但会增加失败的一个大媒体上传（例如连接失败） 的变化 。

因为图书馆的建筑，你有块和进步OR一步没有进步之间作出选择。 最小的块大小应该改善的事情。 较小的块可能：

setChunkSize(MediaHttpUploader.MINIMUM_CHUNK_SIZE)

希望能帮助到你！

Answer 2:

至于块大小，它必须是MediaHttpUploader.MINIMUM_CHUNK_SIZE的倍数这就是为什么它与前值出错了。

Answer 3:

稍微不同的方法与CloudRail SDK，而不是原来的一个。 以下ProgressInputStream可用于上传和下载进度指示。

class ProgressInputStream extends InputStream {

  private InputStream stream;
  private ProgressListener progressListener;
  private long offset = 0;

  public ProgressInputStream(InputStream stream, UploadProgressListener progressListener) {
    this.stream = stream;
    this.progressListener = progressListener;
  }

  @Override
  public int read() throws IOException {
    int res = this.stream.read();
    this.progressListener.onProgressChanged(++this.offset);

    return res;
  }

  @Override
  public int read(byte[] b, int off, int len) throws IOException {
    int res = this.stream.read(b, off, len);
    this.offset += res;
    this.progressListener.onProgressChanged(this.offset);

    return res;
  }

  // You might need to override additional methods but you can just
  // call the corresponding method on the stream property

  public interface ProgressListener {
    void onProgressChanged(long bytes);
  }
}

完整的教程可以发现在这里 。

文章来源: Check progress for Upload & Download (Google Drive API for Android or Java)