Login fails with FoursquareInternalErrorException: net::ERR_CLEARTEXT_NOT_PERMITTED if Foursquare app is installed.

[francais-harry]

Environment:
Library version: com.foursquare:foursquare-android-oauth:1.1.0
Foursquare app version: 11.17.1
Android 10 Pixel 4XL

Prerequisites

• Install Foursquare app from Google Play and login. https://play.google.com/store/apps/details?id=com.joelapenna.foursquared
• Make some app with the library above.

Step by step

1. App calls startActivityForResult with intent from FoursquareOAuth.getConnectIntent
2. Foursquare app comes to foreground, then close immediately.
3. onActivityResult called in the app side with the error below, fails to login.

Note that, if Foursquare app is uninstalled, webview comes and I was able to login by the app. Also, I was able to login with Foursquare app installed on Android 8.0 Xperia X Performance.

	Android 10 Pixel 4 XL	Android 8.0 Xperia X Performance
with Foursquare app	Failed	OK
without Foursquare app	OK	OK

So probably the issue exists on the Foursquare app side with newer version of Android OS, I bit suspect this is related to a clear text traffic feature introduced since Android 9.
https://developer.android.com/training/articles/security-config.html#CleartextTrafficPermitted

Possibly this PR aims to fix the same issue of mine, but preferably the issue should be fixed by the Foursquare app side so that user can skip login hassle, in my opinion.

Stacktrace sample:

com.foursquare.android.nativeoauth.FoursquareInternalErrorException: net::ERR_CLEARTEXT_NOT_PERMITTED
	at com.foursquare.android.nativeoauth.FoursquareOAuth.getAuthCodeFromResult(FoursquareOAuth.java:127)
	at <my app package name>.onActivityResult(SettingsActivity.java:426)
	at android.app.Activity.dispatchActivityResult(Activity.java:8162)
	at android.app.ActivityThread.deliverResults(ActivityThread.java:4838)
	at android.app.ActivityThread.handleSendResult(ActivityThread.java:4886)
	at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:51)
	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
	at android.os.Handler.dispatchMessage(Handler.java:107)
	at android.os.Looper.loop(Looper.java:214)
	at android.app.ActivityThread.main(ActivityThread.java:7356)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)