如何在Android中从Kinvey下载文件

Question

Trying to download publicly accessible file from kinvey to android app tried following code,

FileOutputStream fos = new FileOutputStream(videoName);
        FileMetaData meta = new FileMetaData(videoName);
        meta.setId(videoName);
        kinveyClient.file().downloadWithTTL(meta.getId(), 1200000, fos, new DownloaderProgressListener() {
            @Override
            public void progressChanged(MediaHttpDownloader downloader) throws IOException {
                Log.i("", "progress updated: " + downloader.getDownloadState());
                final String state = new String(downloader.getDownloadState().toString());

                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        //tProgress.setText((tProgress.getText() == null) ? state : tProgress.getText() + "\n" + state)
                    }
                });
            }

            @Override
            public void onSuccess(Void result) {
            }

            @Override
            public void onFailure(Throwable error) {
            }
        });

getting event success but data is not being received. any idea how this will work??

getting error like this :

failure com.kinvey.java.core.KinveyJsonResponseException: InsufficientCredentials
                                                          The credentials used to authenticate this request are not authorized to run this operation. Please retry your request with appropriate credentials

Answer 1

According to the documentation, this is how you are supposed to use the value you get from getDownloadState() . In order to get the progress of your download, you need to first check the downloadState is equal to DOWNLOAD_IN_PROGRESS value, and then use the download.getProgress() method to get the progress, then you can use this to update the value on your progress slider, (you shouldn't be converting these values to string using the toString() method like you've done above.

public void progressChanged(MediaHttpDownloader downloader) throws IOException {
  switch (downloader.getDownloadState()) {
    case DOWNLOAD_IN_PROGRESS:
      //Download in progress
      //Download percentage:  + downloader.getProgress()
      break;
    case DOWNLOAD_COMPLETE:
      //Download Completed!
      break;
  }
}

Code taken from documentation here

Answer 2

Nayana,

You might be getting this error because user does not have permission to access that file. You can try following to solve your issue:

• If you make the file publicly readable, all authenticated users will be able to access that particular file.
• You can make the file accessible by adding read/write permissions for few users in ACL.

Also check the documentation for Access Control List: http://devcenter.kinvey.com/rest/guides/security#entityanduserpermissions

Thanks, Pranav Kinvey Support