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I want to post some data every 5 min to server,
but when I lock the screen, the network is offline and I’m not sure my service is running.
The connection is not only WIFI but also GPRS and 3G.
anyone solve this question?
You should use WifiLock. The the connection will not be lost even if the screen goes dark. If you want to use 3G,look here, particulary at answer by CommonsWare, you should use partial WakeLock then.