Open redirect activity with singleTask launchMode

[carlosmuvi-stripe]

Summary

We started observing deep links not working on DuckDuckGo on Financial Connections:

• On the SDK, our main activity (FinancialConnectionsNativeActivity) opens a browser to handle bank logins.
• DuckDuckGo is launched as new task (task == independent set of activities).
• When a deep link triggers to open back the SDK (RedirectActivity) it opens it on that new task.
• RedirectActivity relies on singleTop to restore the existing FinancialConnectionsNativeActivity and continue the flow. However, since the activity is in a new task, we're not able to reopen it, so it creates a new instance of it (instead of bringing the existing one to front and calling onNewIntent)

Result -> the user stays in DuckDuckGo. (looks like deeplink didn't' trigger)

Solution

Solution: Open the activity observing deep links (RedirectActivity) with singleTask launch mode.

This should ensure that the activity opens in an existing task with the same affinity (same app by default)

Testing

Tested this printing the TaskId of FinancialConnectionsNativeActivity and RedirectActivity. They have different ids before singleTask, but they share the same id now. onNewIntent gets triggered as expected, instead of a new onCreate from a new activity instance.