Re: [android-developers] Networking issues in idle mode

I heard that some devices allow app in background communicate but some devices not

在 2013-11-25 AM6:55，"pierre" <pierre.roux12@gmail.com>写道：

I am having networking issues in idle mode (when the screen is off).

I have attached a test program called BeepTester, in order to explain my difficulties.

This test program allows to start a service that in turn starts:

=> a periodic timer that sends a short UDP packet (to port 7000) to the localhost, every 4 seconds,

=> a thread that listens to the UDP port 7000 and that produces a beep sound after packet reception.

On wakeup mode, everything goes fine, there is one beep every 4 seconds.

In "idle" mode it depends on which device we use:

On a Samsung Galaxy Note I, it works OK as in the wakeup mode.

On a Samsung Galaxy S4, it stops working once the screen goes off (there are exceptions: we may hear some beeps occasionally, and not regularly).

I have also tried to use various kinds of wavelocks (not included in the attached test) but It was not really effective.

Is it normal?

And do we need to use wakelocks in order to do networking in idle mode?

  Pierre

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