Do 'something' when App opened?

🚧 Developers
#1

I have an app that has some device info but in order to see the latest I need to:
-Open the app
-Then hit refresh button. This button I put tied to a refresh Handler function.

Otherwise the data displayed in opened app is from previous time app was opened.

Is there something I can use to call a specified Handler when the app is opened? Kinda like how 'updated()' runs every time you hit 'Done' but instead for every time app gets opened.

#2

Sort of. Your app can't be "opened" unless it is displaying one of the UI pages. These are generated from a call to a method corresponding to that page in your app code, and you can call whatever methods you want from there.

For example, if this is part if your app:

preferences {
	page(name: "mainPage")
}

// ...

def mainPage() {
	dynamicPage(name: "mainPage", title: "My Page") {
		section {
			paragraph "Stuff here..."
		}
	}
}

...you could put whatever you need to inside that mainPage() method, e.g., a call to some other method in your app (or on a device, etc., though I really prefer to keep that kind of thing to a minimum on page loads). This will be called whenever that page is rendered, essentially whenever your app UI, or at least this page, is opened.

This might need to be a dynamicPage instead of a plain page to work (as above). With your kind of app, you might already be using these; if not, it's an easy change!

#3

Yeah it was as easy as that! I put under mainPage.

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