Once portal detected, the notification should be hidden when signed in about captivate HOT 2 CLOSED

Register a listener for TIME_TICK such that, when the screen is on and portal state is needs_signin, the portal detector is fired every minute. This should be stopped whenever the screen turns off (and restarted when it's back on, if the conditions are still true), and when the portal state changes (to unknown, no_portal, or signed_in).

This differs from #3 in that the timer is only running when the portal isn't signed in.

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A better solution

This allows finer-grained control over timing, and handles on SCREEN_ON cases.

Write custom version of IntentService (same API), with one change: doesn't automatically stop the service/thread when the queue is empty. The service then stops itself manually whenever state is not SIGNIN_REQUIRED or SIGNING_IN.

When it is in one of those states, schedule a refresh check every 30 seconds (using sendDelayed), unless the screen has been turned off.

When entering either of those states, or SIGNED_IN (i.e. whenever the device is on a portal), register a handler for the screen on broadcast intent. The handler should simply call startService, which will handle both of the following cases:

1. SIGNIN_REQUIRED or SIGNING_IN: starts the update loop timer
2. SIGNED_IN: checks if session has timed out, which is basically issue #3

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