Re: [android-developers] How to run application in background on click of device back button

On Sun, Dec 18, 2011 at 9:31 PM, Uday Gokhale <gokhale.uday@gmail.com> wrote:

1) I get the message,on click of that message I want to check whether my application is install on device?

You app can only check if it is installed ... if it is installed ... 

2) If my app install on a device i want to show route,

3)I want my application to run in background when back key(Device) pressed.

http://developer.android.com/reference/android/app/Service.html

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TreKing - Chicago transit tracking app for Android-powered devices

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