AndroidAuthSession, DropboxException are not recognizable

For Android, we recommend using the official Dropbox API v2 Java SDK:

https://github.com/dropbox/dropbox-sdk-java

It sounds like you've already installed that. It doesn't use the same classes/interface as the old version, so you'll need to update your code. There's an example Android app using it here:

https://github.com/dropbox/dropbox-sdk-java/tree/master/examples/android

For instance, your AndroidManifest.xml should be set up as shown here:

https://github.com/dropbox/dropbox-sdk-java/blob/master/examples/android/src/main/AndroidManifest.xml#L33

You start the flow by calling startOAuth2Authentication as shown here:

https://github.com/dropbox/dropbox-sdk-java/blob/master/examples/android/src/main/java/com/dropbox/core/examples/android/UserActivity.java#L36

You complete the flow by calling getOAuth2Token as shown here:

https://github.com/dropbox/dropbox-sdk-java/blob/master/examples/android/src/main/java/com/dropbox/core/examples/android/DropboxActivity.java#L22

Your app can store and re-use the resulting access token for that user, as the example does here:

https://github.com/dropbox/dropbox-sdk-java/blob/master/examples/android/src/main/java/com/dropbox/core/examples/android/DropboxActivity.java#L24

You can find examples of calling getMetadata and listFolder here:

https://github.com/dropbox/dropbox-sdk-java/blob/e707252998d14821b06e7e2a2b69a9c80d7b0829/examples/web-file-browser/src/main/java/com/dropbox/core/examples/web_file_browser/DropboxBrowse.java#L208

https://github.com/dropbox/dropbox-sdk-java/blob/c6aeb4bf3011e6b803eaa325ea20a52f8412ee0f/examples/tutorial/src/main/java/com/dropbox/core/examples/tutorial/Main.java#L33