Dropbox的Andr​​oid的API同步上传文件，并显示进度条 [英] android Dropbox sync api upload file and display progress bar

问题描述

我的应用程序看起来像的 Dropbox的同步SDK ，但我要上传新文件，Dropbox的时候在列表视图中显示进度条。结果这个例子听文本文件的变化更新文件，但对我来说，我上传多个文件类型（文本和二进制）。这是我尝试上传文件：

My app look like the Dropbox Notes example from Dropbox sync sdk, except I want to display a progress bar in listview when uploading new file to Dropbox.
The example listen text file change to update file, but in my case, I upload many file types (text and binary). Here is my try to upload file:

DbxPath path = new DbxPath("/test.pdf");
DbxAccount acct = NotesAppConfig.getAccountManager(getActivity()).getLinkedAccount();
DbxFile mFile;
DbxFileSystem fs = DbxFileSystem.forAccount(acct);
try {
   mFile = fs.open(path);
 } catch (DbxException.NotFound e) {
   mFile = fs.create(path);
   }
  mFile.addListener(mChangeListener);
  FileOutputStream out = mFile.getWriteStream();
  File sdcard = new File(Environment.getExternalStorageDirectory(), "test.pdf");
  FileInputStream in = new FileInputStream(sdcard);
  copyFile(in, out);
  out.close();
  in.close();

 private final DbxFile.Listener mChangeListener = new DbxFile.Listener() {

    @Override
    public void onFileChange(DbxFile file) {

        try {
            if(file.getSyncStatus().pending == PendingOperation.UPLOAD ){
                long byteTotal = file.getSyncStatus().bytesTotal;
                long byteTransfer = file.getSyncStatus().bytesTransferred;
                Log.d(TAG, "file changed: " +  byteTransfer + " / " + byteTotal);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
};

 public static void copyFile(InputStream in, OutputStream out) throws IOException {
    byte[] buffer = new byte[1024];
    int read;
    while ((read = in.read(buffer)) != -1) {
        out.write(buffer, 0, read);
    }
}

加载器使用这个方法来获取文件列表：

The loader use this method to get file list:

List<DbxFileInfo> entries = dbxFileSystem.listFolder(dbxPath); 

这code以上即可工作，但只有当上传完成显示文件列表视图。因为该示例使用 DbxFileInfo ，所以我不知道如何获取该文件的状态，当它被上传。结果有没有办法做到这一点？

This code above can work, but it only displays file in listview when upload complete. Because the example use the DbxFileInfo, so I don't know how to get status of this file when it is uploading.
Is there any way to do this?

推荐答案

只要你保存文件，我相信你应该用 listFolder 看到它。你说，这不是你看到了什么？

As soon as you save the file, I believe you should see it with listFolder. Are you saying that's not what you see?

在显示上传进度而言，记住同步API旨在与缓存脱机工作。它可能没有什么意义，显示一个进度条，如果你没有连接到互联网......这可能是小时（或几天）文件上传之前。

In terms of showing progress of an upload, keep in mind that the Sync API is designed to work offline with caching. It probably wouldn't make sense to show a progress bar if you're not connected to the internet... it could potentially be hours (or days) before the file is uploaded.

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