On Tue, Apr 8, 2014 at 4:21 AM, Jia Li <jarlym...@gmail.com> wrote:

> 1. How to detect if the application is in foreground, background or not
> running?
>

Why do you need to do this? You get a GCM message, you respond to it.
Whether the app is foreground or background ("not running" is not an option
- if you're responding to the message, you're running) is irrelevant.

2. How to find out the top activity if the app is running (either
> foreground or background)
>

Again, why do you care?


> 3. If it is not running, how to launch it.
>

If you get a GCM message and can handle that message, your app is running.


> 4. If it is running in background, how to bring it to foreground
>

Call startActivity, just like normal.

-------------------------------------------------------------------------------------------------
TreKing <http://sites.google.com/site/rezmobileapps/treking> - Chicago
transit tracking app for Android-powered devices

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