Service not always restarted on ASUS 10" tablet

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I'm developing an app for my tablet that is to turn on the screen when I rotate it to the vertical (the power switch is dodgy). It has an optimization to turn off the sensor from 22:00 to 06:30. The app works most of the time. However sometimes it fails. For example this morning I picked it up at 07:10 and the screen came on as expected. I put it down for about a half an hour and when I picked it up again it did not come on. I plugged in the power and it came on. I stopped my service and restarted it then and it has been running fine: pick up and it comes on when the screen has gone off.

Looking at the logs I see that the system stops the service frequently(maybe every 30 minutes) and then restarts it, passing a null intent to the onStartCommand() method. I've used SharedPreferences to save the app's state and am able to successfully restart the app where it needs to be.

My question: why didn't the app work this morning after it had worked on the first pickup of the morning? Any ideas on how to debug this or any work-arounds?

Thanks,
Norm

Posted 6-Oct-14 10:01am

NormR1

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Sergey Alexandrovich Kryukov 6-Oct-14 16:13pm

This happens because you have some bug. Due to nice comfortable weather, my access to your system is somewhat limited, so I cannot fix it. :-)
—SA

NormR1 10-Oct-14 12:32pm

How is the weather now? Any suggestions for How do to find the bug?

NormR1 13-Oct-14 7:19am

How is the weather now?

NormR1 8-Oct-14 18:18pm

Thanks for the response.
It's a very elusive bug. The code works so many times and fails so few times that I'm not able to come up with a debugging scheme to find out a reason or pattern for the failure.
Do you have any suggestions?

Something I've observed by looking at the logs is that the system restarts my service (passing a null intent to the onStartCommand() method) very soon after I have plugged in the tablet to turn on the screen. How would a bug in my code cause that?

Another observation: the system often restarts my service 5 seconds after the AlarmReceiver is supposed to receive an alarm: at 22:00:05 for an alarm set for 22:00:00.

NormR1 16-Oct-14 7:50am

The program continues to work differently each morning. Yesterday morning it worked as desired. This morning there was a delay in starting the service after I rotated the tablet. Why would the Android system restart my service when I lifted and rotated the tablet? My service should have been executing and receiving Sensor values which it would use to turn on the screen.

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