Android Question Dropbox SDK V2 - Java: problem downloading

Tom Tran · Jul 31, 2020

Hi,
I am using the Dropbox SDK V2 - Java and I can connect, list files, and even upload files. However, when I try to download a file, the file that I end up with is empty (0 bytes). I have tried several different files, all of them are small in size. Any ideas or suggestions?
Here is the download (and upload) code:

B4X:

Sub btnGetFile_Click
    dbxFiles.download("/Work/test.txt", File.DirDefaultExternal, "test.txt")
End Sub

Sub btnSendFile_Click
    dbxFiles.upload(File.DirDefaultExternal, "1.jpg", "/Work/" & "1.jpg", False, False)
End Sub

When the download is performed, in the log I get:
files.download()
files.download(after new File())
files.download(create fos)
files.download(fos created)

DonManfred · Jul 31, 2020

Tom Tran said:
Sub btnGetFile_Click dbxFiles.download("/Work/test.txt", File.DirDefaultExternal, "test.txt") End Sub

Code with File.DirDefaultExternal = broken code.
Runtime Permissions (Android 6.0+ Permissions)

Tom Tran · Jul 31, 2020

DonManfred said:
Code with File.DirDefaultExternal = broken code.
Runtime Permissions (Android 6.0+ Permissions)

Thank you for the reply, but how do I fix it? I tried:

B4X:

    dbxFiles.download("/work/temp.htm", rp.GetSafeDirDefaultExternal("") & "/Save", "Temp.htm")

But that produced the same results (a 0 byte file).

DonManfred · Jul 31, 2020

Follow the Runtimepermissions tutorial.

Tom Tran · Jul 31, 2020

DonManfred said:
Follow the Runtimepermissions tutorial.

So I followed the tutorial and I still have the exact same problem.

B4X:

    Dim testfolder As String = rp.GetSafeDirDefaultExternal("Save")
    File.WriteString(testfolder,"test.txt","aaa")
    dbxFiles.download("/work/temp.htm", testfolder, "Temp.htm")

The code above creates two files. File test.txt contains aaa and file Temp.htm is empty. On Dropbox, file Temp.htm is not empty.
Any other advice?

drgottjr · Aug 1, 2020

dropbox is case-insensitive, android is not. you're asking for trouble by the way you switch back and forth when naming files and folders and referencing them.
the log messages are generated by you; they'll say anything you tell them to say.

Tom Tran · Aug 1, 2020

drgottjr said:
dropbox is case-insensitive, android is not. you're asking for trouble by the way you switch back and forth when naming files and folders and referencing them.
the log messages are generated by you; they'll say anything you tell them to say.

Thank you for the input, but I have already tried several variations of capitalization since in different places within Dropbox, I can see things both all lower case and capitalizing the first letter of the directory and file and I get the exact same results every time.

DonManfred · Aug 1, 2020

Upload a small project which shows the issue.

I´m pretty sure the library does work if setup correctly and correctly using Runtimepermissions.

Tom Tran · Aug 1, 2020

DonManfred said:
Upload a small project which shows the issue.

I´m pretty sure the library does work if setup correctly and correctly using Runtimepermissions.

So for an example, I slightly modified a copy of your DropboxV2Example1-Auth program.

DonManfred · Aug 1, 2020

Try using try catch for the download. It may reveal more info

B4X:

    Try
        dbxFiles.download("/Work/Temp.htm", testfolder, "Temp.htm")
    Catch
        Log(LastException)
    End Try

Tom Tran · Aug 1, 2020

DonManfred said:
Try using try catch for the download. It may reveal more info

B4X:

Try dbxFiles.download("/Work/Temp.htm", testfolder, "Temp.htm") Catch Log(LastException) End Try

Nothing was added to the log, so I suppose that no exception occurred.

DonManfred · Aug 1, 2020

Try this version and the new jar from Dropbox

Maven Repository: com.dropbox.core » dropbox-core-sdk » 3.1.4

mvnrepository.com

As meta can be null you need to check....

B4X:

Sub dbxFiles_DownloadFinished(success As Boolean, meta As FileMetadata, error As String)
    If meta = Null Then
        Log($"dbxFiles_DownloadFinished(${success}, ${error})"$)
    Else
        Log($"dbxFiles_DownloadFinished(${success}, ${meta}, ${error})"$)
    End If
    If error.Contains("Exception") Then
        Log(LastException)
    End If

End Sub

Tom Tran · Aug 1, 2020

DonManfred said:
Try this version and the new jar from Dropbox

Maven Repository: com.dropbox.core » dropbox-core-sdk » 3.1.4

mvnrepository.com

As meta can be null you need to check....

B4X:

Sub dbxFiles_DownloadFinished(success As Boolean, meta As FileMetadata, error As String) If meta = Null Then Log($"dbxFiles_DownloadFinished(${success}, ${error})"$) Else Log($"dbxFiles_DownloadFinished(${success}, ${meta}, ${error})"$) End If If error.Contains("Exception") Then Log(LastException) End If End Sub

Yes! That did it! Thank you very much!

Sabotto · Aug 5, 2020

I have the same problem. I downloaded version 3.1.4 of the library. But now in the library folder I have both 3.0.10 and 3.1.4. If I remove the 3.0.10, during compilation it asks me.
Do I have to keep them both?

And how can I test if the file "Temp1.htm" exists?

B4X:

dbxFiles.download("/MyFolder/Temp1.htm", testfolder, "Temp2.htm")

Because I believe it is not detected..

DonManfred · Aug 5, 2020

Sabotto said:
Do I have to keep them both?

with the newest library version you only need the newest jar.
Only one of them is needed.

Sabotto said:
Because I believe it is not detected..

you need to get a filelist from the folder first to check which files are inside this folder.

I do not answer any more questions in this thread.

Sabotto · Aug 5, 2020

Ok. Solved. hadn't used the version 0.47 but the 0.44. Thanks

Android Question Dropbox SDK V2 - Java: problem downloading

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Maven Repository: com.dropbox.core » dropbox-core-sdk » 3.1.4

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Maven Repository: com.dropbox.core » dropbox-core-sdk » 3.1.4

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