According to this Android C2DM keeps a socket alive with a heartbeat mechanism, making it able to receive push messages. This made me hope I could deliver messages to sleeping phones with an active wifi connection.
I've made an implementation setting the "delay_while_idle" to '0'. The message is delivered if my phones' screen is powered off, but not if the phone goes to sleep (tested with intervals 20mins, 1-6 hours).
I have acquired a partial cpu lock + a full wifi lock just in case.
Have I simply made something fundamentally wrong or did I misunderstand the C2DM push functionality?
Can I send messages to sleeping phones or not?
Using alarmmanager instead of wakelocks could keep your phone alive just enough. See this implementation. Will test a variant of this.
来源：https://stackoverflow.com/questions/4661836/android-c2dm-sleeping-phone