How to android server client to send real-time information?

For example: android has a list of clients, the server modify the contents of the list, how can we modify the list of the contents of the server when the android client also displays the contents have been modified after? Instead of quitting android restarts after revision before displaying content.
Methods (such as while true, requests a certain time interval data) Do not waste too much traffic<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
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Would it be possible to push?