Android Sleep/Standby Mode

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I’m sure the workaround isn’t too difficult

Using AlarmManager is a bit tricky.

My question is what exactly does “sleep mode” do on android systems?

Primarily, it shuts down the CPU. Along the way, non-essential radios (WiFi, GPS) will have been shut down as well.

What does it stop, what doesn’t it stop, etc.

About the only thing you can count on not stopping is the GSM or CDMA radio (for incoming calls, SMSes, and IP packets) and AlarmManager.

By sleep mode I mean, of course, when you press the power button and the screen goes black.

Actually, that’s not sleep mode, per se. That is the screen turning off.

The device will go into sleep mode shortly thereafter, if nothing is keeping it awake with a WakeLock. However, there is no guarantee that within a millisecond of you pressing that button and the screen turning off that the CPU is off.

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