Android Programming and Technical Programming Technical

Is it mandatory to call onCreate() and onStart() in android?

Options
1) No, we can write the program without writing onCreate() and onStart()
2) Yes, we should call onCreate() and onStart() to write the program
3) At least we need to call onCreate() once
4) None of the above

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Android Other Question

What is a GCM in android?
Options
1) Google Cloud Messaging
2) Google Count Messaging
3) Google Message pack
4) None of the above
What is sleep mode in android?

Options
1) Only Radio interface layer and alarm are in active mode
2) Switched off
3) Air plane mode
4) None of the Above