After I successfully packed both the mobile temple and the 3d Person starter content, they started on my Nexus 7 I got an short black screen and then I got the Message “Mobile/AndroidTest2 has exited”.
Nothing more.
i met the same problem with Epic Citadel downloaded from Play Store on my SAMSUNG Galaxy !!
Posting logs from logcat would help.
You could try the answer to this question - Android game crashes on startup - Programming & Scripting - Epic Developer Community Forums
How do I get the logs?
adb logcat -d > C:\log.txt
will dump the logs into C:\log.txt. The relevant crash dump will be towards the end of the file.
I’ll try this tomorrow, thank you for the help.
I had this problem also. I was trying the side scroller sample. I finally found that it was the text placed on the floor causing my problems. Deleting it fixed it for me 
Hello,
Thank you for your report. We were not able to investigate this on the engine version you reported, but there have been many version changes to UE4 since this question was first posted. With a new version of the Engine comes new fixes and it is possible that this issue has changed or may no longer occur. Due to timetable of when this issue was first posted, we are marking this post as resolved for tracking purposes. If you are still experiencing the issue you reported in the current engine version, then please respond to this message with additional information and we will investigate as soon as possible. If you are experiencing a similar, but different issue at this time, could you please submit a new report for it.
Thanks!