sleep-mode

I'm new in android . I struggle with my application approximately 3 weeks. I need sent and receive packets in normal mode and sleep mode . My app must exchange data a 5 seconds. I tried using alarmmanager but on android 5 it's not works. On android 5 an interval changes it on 60 seconds. Such a solution makes the battery wears out quickly. When I use normal asynctask, not IntentService , then it works only when screen is ON and app is visible. When app is hidden or I click power OFF then exchange data stops working. What is the best solutions? Even RTC_WAKEUP doesn't help most of the times.

I wanted to detect two events : Device gets locked/unlocked. Device goes to sleep and the screen blackens. First one I have been able to achieve here: Is there a way to check if the iOS device is locked/unlocked? Now I want to detect the second event, is there any way to do it ? Nate You basically already have the solution, which I'm guessing you found from one of my recent answers :) Use the com.apple.springboard.hasBlankedScreen event. There are multiple events that occur when the screen blanks, but this one should suffice: CFNotificationCenterAddObserver

I have made an app that starts a service, which starts a timer, which fires off a small function after an amount of time. This is working great on the emulator and on the Motorola Droid 1, but it doesn't work on the Droid X when the phone has been put into sleep mode. What I have discovered is that the timer seems to pause when the phone is in sleep. It doesn't seem to do this on the Droid 1, or the emulator. I'm sure the workaround isn't too difficult, so I'm not asking for help (for once) I just want an explanation, to better understand this. My question is what exactly does "sleep mode" do