Building Player Baking Runtime Android Forever Loading

clear your GI cache from the Edit > preferences menu , i had a similar issue and doing so fixed it if you can't clear the GI cache go to Lightning window and uncheck the auto build checkmark close unity and open again ...

There is no information about what unity version you are using, but in Unity 5.1 changelog it is said that they removed crashed from lightmap baking:

Lightmapping: Fixed race condition crash in lightmap bake when converting .exr files.

If anyone is still experiencing this crash, maybe it would be nice considering Unity update? It could be your case.