Problem with saving property

Hi all!

I am working on a watch face. After I receive information through WebRequest, depending on the response, I save the property using the setProperty method.

function onBackgroundData(data) {
    	Sys.println(data);
    	for (var i = 0; i < data.size(); i++){
    		if (data[i] != null){
    			if (data[i].hashCode() == "ERROR".hashCode()){
		    		App.getApp().setProperty("testVar", "notOkay");
		    	}
		    	else if (data[i].hashCode() == "DONE".hashCode()){
		    		App.getApp().setProperty("testVar", "okay");
		    	}
    		}
    	}
		Ui.requestUpdate();
    }

This is what the properties.xml document looks like

<properties>

    <property id="testVar" type="string"></property>

</properties>

While the dial is running, everything works. The string is saved and works correctly. However, if I exit the application and start it again, the data disappears.

getProperty returns what is specified by default in properties.xml

I’ve been racking my brains for three days looking for a solution to this problem. How do I save a value so that it works even after restarting the application?

Top Replies

jim_m_58 over 5 years ago +1 verified

You probably want to use the object store/Storage vs a property the way you're doing things. (saving it to the settings file).

If you comment out the <property id=... line, that will put it in the…

All Replies

+1 jim_m_58 over 5 years ago

You probably want to use the object store/Storage vs a property the way you're doing things. (saving it to the settings file).

If you comment out the <property id=... line, that will put it in the object store. (local storage for your app)

Where are you reading it when your app starts? Some things in app base get called when either the forground or background runs, some only if the foreground runs, and some inly when the background runs.

0 ERSHOVLAD over 5 years ago in reply to jim_m_58

function initialize() {
		AppBase.initialize();
		
		if (equals(getProperty("testVar")) != equals("")){
			// DO SOMETHING
		}
		
		//
		//
		//
		
}

I'm trying to call getProperty in the initialization function

It is very important for me that the data stored in memory always remain there. Even if the user starts using another dial, and then returns to mine again, the saved line will not disappear.

0 jim_m_58 over 5 years ago in reply to ERSHOVLAD

That gets called when your main app starts as well as when the background starts.

Print in some println calls and see what you're getting and when.

0 ERSHOVLAD over 5 years ago in reply to jim_m_58

I try to call getProperty throughout the entire application cycle. I call it in the initialization function, I call it on the onUpdate function, and so on.

If I just got a response, then getProperty returns the correct value.

But if I restart the application, then getProperty on the entire application life cycle returns {default testVar value}, and not what I saved in the previous application session.

The bottom line is that I want to send WebRequest once, get the necessary line and no longer call it, saving the response once and for all.

0 jim_m_58 over 5 years ago in reply to ERSHOVLAD

Put in a bunch of println calls, create a log file on your devices, and see what's happening and when.

You really should only need to get it once when you start and then write it when it changes. I use Storage for this type of thing all the time.

0 ERSHOVLAD over 5 years ago in reply to jim_m_58

Okay, then I still have one more question, probably ..

Does using Storage guarantee that the information stored in this way will be saved after the application is restarted, after a crash, and after the application is updated from the store?

0 jim_m_58 over 5 years ago in reply to ERSHOVLAD

It should. As I said I do this all the time in watch faces and widgets. The thing is I store the data itself in onBackgroundData so when the app restarts I have that to display.

0 ERSHOVLAD over 5 years ago in reply to jim_m_58

I will try, many human thanks to you!

0 PlayItLoud over 5 years ago in reply to ERSHOVLAD

No guarantee that the info will be stored and available if app is restarted, crash or after you update or when garmin does batch updates or firmware updates.

0 jim_m_58 over 5 years ago in reply to PlayItLoud

You could lose the latest on an app crash or a device crash, but you shouldn't when just restarting an app. You move to a widget and back, a Wf gets restarted. You shouldn't lose the data when an app gets updated either. If you do, you meed to look at what you're doing in the app.