Where should I locate the 'startOAuth2Authentication'?

[Cross-linking for reference: https://stackoverflow.com/questions/49070230/where-should-i-locate-startoauth2authentication ]

 

1) The startOAuth2Authentication method is what kicks off the Dropbox app authorization flow, so you should put it wherever in your app you handle the request from the user to connect their Dropbox account, e.g., the handler for tapping on a "Link to Dropbox" button in your app. (For example, that's what the Android example app does.)

 

The import lines are what import the necessary classes from the Dropbox SDK.  (You don't need the "OpenWithActivity" one for your app though.) The import/"can't resolve" issues you're seeing seem to indicate that you don't have the SDK successfully installed. We recommend using either Gradle or Maven to install it, as documented in the readme. Make sure you have one of those set up and working correctly. If you have tried that, and it's not working, please share whatever Maven/Gradle error you're getting.

 

2) That getSharedPreferences call is to the Android getSharedPreferences method. The first parameter there is the "name" for the "Desired preferences file". You can supply whatever name you want.

 

That getString call is to the Android getString method. The first parameter is the "key" for "The name of the preference to retrieve". Likewise, the exact string is up to you. 

 

With both of these, it's mostly just important that you're consistent with the strings you use, as it's how you will store and retrieve the account information. There's an example of these being used to store and retrieve the Dropbox access token in the Android example.

 

The getOAuth2Token method retrieves the access token, but only when the user is actually going through the app authorization flow. If they are not, it will return null. You should store and re-use the access token when you get it. That's done in the example here.

That line should run when you click on the "Login with Dropbox" button, not the "+" button. If you're seeing the "+", it means you've already connected Dropbox.

Anyway, I just tried it and it's working for me. (Also, make sure that you're actually debugging, and not just running. I.e., use the "bug" icon when in Android Studio, not the "play" icon.)

Make sure you have AuthActivity registered in your app's package, and only in one, as shown here:

https://github.com/dropbox/dropbox-sdk-java/blob/master/examples/android/src/main/AndroidManifest.xml#L26

If you had others registered but removed them, try restarting your device.