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83c9bc5aa6
Reported on #234 as a screen that flashes white "over and over", unkillable — "there is nothing we can do on the tablet". It is a leaked listener. ProvisioningActivity installs onRegistered/onUnpaired/onPaired on WebSocketService and then finish()es. The service outlives it and nothing ever clears them: MainActivity assigns neither of those three, so nothing overwrites them either. onPaired therefore stays wired to a destroyed Activity for the life of the process — keeping it alive, and still firing. And it fires often. The server sends device:paired on EVERY register, not only the first. So: register -> paired -> the stale callback starts MainActivity with CLEAR_TASK -> new Activity binds and registers -> paired -> again. Measured on an Android 12 tablet with a bare paired device and nothing assigned: 240 activity starts in 180 seconds, about 1.3 a second, indefinitely. Android 12 is where it becomes intolerable rather than merely wasteful: every launch draws a splash screen there, so each iteration is a visible white flash. The same loop on Android 9 has no splash and reads as an occasional glitch — which is why it was originally dismissed as unreproducible after a clean reinstall. A clean reinstall starts MainActivity directly and never runs ProvisioningActivity, so the callback is never installed and the loop never begins. Pairing is what arms it. onPaired is now one-shot — the hand-off to MainActivity is all it was ever for — and all three are dropped in onDestroy too, which covers backing out before pairing completes. Same device, same pairing flow, 180s: 240 activity starts and 240 splash screens before, 0 and 0 after, with registrations falling from 240 to 2. ⚠️ No other callback is ever nulled either (there are ~20). MainActivity's are overwritten by the next MainActivity so they self-heal, but each one leaks the previous Activity until then. Worth a sweep; this commit fixes only the three that never get overwritten. |
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