diagnosing android crash at launch

[Mike Kerner]

i have an app thad works fine on ios. i just built it for android to test
it out. at launch i get a black screen, and then the app crashes.
do we have any tricks for diagnosing this behavior?

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On the first day, God created the heavens and the Earth
On the second day, God created the oceans.
On the third day, God put the animals on hold for a few hours,
   and did a little diving.
And God said, "This is good."