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Why Auth.getDbxCredential method returns null after PKCE authentication (Dropbox Android JDK) ?

Hi,

I'm trying to use the new authentication flow with short-live tokens and refresh tokens on an Android App with Dropbox JDK.

I'm using the

Auth.startOAuth2PKCE()

method which works correctly, but when I tried to access the credentials in the onResume method,

DbxCredential credential = Auth.getDbxCredential();
credential.getRefreshToken(); // NullPointerException

I get a NullPointer exception.

I'd like to access and save the refresh token to the shared prefs and resuse it to prevent the user to be logged out every 4 hours.

Why the getDbxCredential() returns null ?

Thanks for your help.

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Accepted answers

Greg-DB

@didouchk In addition to what Здравко said, note that there is an Android-specific example here. Make sure you're implementing the authorization flow as shown.

And if something doesn't seem to be working as expected, please reply with:

the version numbers of the Android platform and Dropbox SDK you are using
the steps to reproduce the issue, including relevant code snippet(s), but don't include any access or refresh token(s)
the full text of any error or unexpected output

All comments

Здравко

Hi @didouchk,

The description of your issue is not very "rich". Missing details on how you have done everything! The devil is in details. 😁

There is an authorization example for Java SDK. PKCE implementation could be seen in corresponding class. Take a look there and you can figure out what's missing in your code, I believe. 😉

Hope this helps.

@didouchk wrote:
..., but when I tried to access the credentials in the onResume method, ...

You are trying in onResume method, but is it as a result of real resume action (i.e. on authentication end)? 🤔 ... or ...?

Greg-DB

@didouchk In addition to what Здравко said, note that there is an Android-specific example here. Make sure you're implementing the authorization flow as shown.

And if something doesn't seem to be working as expected, please reply with:

the version numbers of the Android platform and Dropbox SDK you are using
the steps to reproduce the issue, including relevant code snippet(s), but don't include any access or refresh token(s)
the full text of any error or unexpected output

PIXIP

I'm just pointing out that ALL the links here are broken since the repository changed on GitHub

Greg-DB

@PIXIP Thanks for the note. I've updated the links in my post.