GPS coordinates in a loop

[Przem_K]

Hi! I'm not a professional, so my question might
be a little silly for you, but... I need to create a simple app.

I want this app to show a message when I'm at specific location. It shows coordinates correctly, but doesn't react for entering the zone. When I'm at the zone, it shows a message, but when I'm going from the outside of zone to the location and get there, nothing happens. It looks like it read location only once, when I press the start button and doesn't react for changes. I tried to use loop and "if" - nothings helps. GPS coordinates are refreshing with interval of 1 second.

I hope, some of you may have an idea, how to solve it

[SteveJG]

Welcome Przem.

Yours is not a silly question.

@Przem_K

show a message when I'm at specific location

The method you are trying to determine if you have arrived at a specific location will not work for numerous reasons. Some of these reasons are discussed in Using the Location Sensor . To solve your issue, requires an understanding of how a GPS works, the article explains that.

Here are methods that will work

Location sensor (ringed fence / circular ringed fence)

I do not believe what you tried will work unfortunately. How to tell you if your device is near a destination is either to create a ringed fence and determine whether you are in the polygon of the geocoordinate limits or to calculate your distance from point of interest and when that distance is within certain limits; do something. A simple way to determine how far you are from a destination is described here: Geofence - using the MIT Map and Circle components to define a circular geofence b…

@Przem_K

GPS coordinates are refreshing with interval of 1 second

unfortunately this is not how a GPS receiver works. The LocationSensor only will report a location change after a satellite satellite fix. Most cell phone gps receivers, at best, refresh after about 20 seconds.

Good luck with your Project.