When I select my world, it says "Building Terrain" and then very briefly "Saving chunks" and minecraft exits.
Running adb logcat reveals this segfault:
http://paste.debian.net/hidden/e12045d5/
Attaching world files, zipped. (World was named Puppy if that matters)
Excellent bug report! 🙂 I must have missed it, but solved the same issue when I saw MCPE-422. Closing this as duplicate.