How to Bring Android Activity to the Foreground and Detect if its in background?

开发者_StackOverflow中文版I have a callback inside an Activity which is called by a remote service. I fire a Toast when it gets called so, i know its getting called but its in the background, so I need a way from within the activity to make it go to the foreground. How can this be done. Also detect if I am in Foreground or not. How can this be done?

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Using the Android Lifecycle you can detect if your Activity is in the background. To return your Activity to the foreground use a Notification in the Status Bar. You can forcibly move your Activity to the foreground by firing an Intent but that can cause frustration and annoyance to the user.

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Just call startActivity with the right Intent.

Edit: Forgot to say, that it'a a very confusing behaviour, if an Activity brings itself to the front. The user could do something else and be disturbed. Set a notification instead.