Adam Barth 241fc21055 Don't destory the engine when detaching from the window
Reading the Android docs, it sounds like an android.view.View can re-attach to
the window after detaching. Previously, we destroyed the engine when we
detached from the window. Now we wait for the activity to be destroyed.

Hopefully fixes #997
2016-01-04 10:39:09 -08:00
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