show Alertview even when App is inactive

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I just saw that it's anyhow possible to show AlertViews from the Background on HomeScreen. enter image description here

This was triggered by the App "UP by Jawbone"

Does anyone know how to do this?

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That's a system message because UP tried to use Bluetooth. It wasn't generated specifically by the app.

Apps cannot display alerts that display when they're in the background. The best you can do is use a Local Notification.