Android Tutorial GPS / GNSS tutorial

The GNSS library replaces the old GPS library. The GNSS library is available here: https://www.b4x.com/android/forum/threads/gnss-library-an-updated-gps-library.109110/#content

Using it is quite simple:
1. Checking whether location services are available. If not take the user to the settings.
2. Request permission.

If the purpose is to get the user location then the FusedLocationProvider might be a better option: https://www.b4x.com/android/forum/threads/fusedlocationprovider-resolution-dialog.111652/#content

 

[Erel]

Satellites are working now but everything shows up as "false" instead of true. Latitude and longitude still aren't working.

Are you checking it outdoors? GPS receivers mostly don't work indoors.

@Danbicky please start a new thread for this question.

 

[SCIS]

Are you checking it outdoors? GPS receivers mostly don't work indoors.

@Danbicky please start a new thread for this question.

Managed to get it working now. Thanks, Erel!

Really unfortunate for the poor connection indoors because there is a possibility that users also want to get their location when they're not outdoors (with the app we are designing).
Googlemaps app itself works perfectly indoors though.

Is there any way to get it working indoors?

Thanks in advance!

 

[Erel]

Google Maps uses several sources to find the location. You can use LocationManager library or this library: https://www.b4x.com/android/forum/threads/fusedlocationprovider.50614/#content

 

[Gentry]

What is the dataype of the GPS Location object? It apparently is not one of these types : Lists, Arrays, Maps, Strings, primitive types and user defined types, as it does not write to file when used in an list element via RandomAccessFile.WriteObject. It displays as this:

(ArrayList) [Location[gps 41.908098,-88.209641 acc=14 et=+1d9h1m25s31ms alt=201.0 vel=0.0 {Bundle[mParcelledData.dataSize=40]}]]

And I am guessing that the {Bundle...} portion is a problem.

If you needed to save a list of locations, and RandomAccessFile is not an option, is there an alternative?

My challenge is that Location is part of a user defined datatype(UDD), and I am attempting to save a list of this UDD to file, and read it back. When the list of UDD is read back, the type of the location element is lost (all values are null), and when I try to initialize2(lat,lon) the location type element, it fails, and if I try to check if it isInitialized (as a Location) I get this error:

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean anywheresoftware.b4a.gps.LocationWrapper.IsInitialized()' on a null object reference

I was unable to find a new thread on this subject, and the question was posted in this thread previously, so I am attempting to ask the question in a way that is applicable to the main subject of this thread.

Thanks,
Gentry

 

[Erel]

It is always better to start a new thread.

You will need to create custom types and convert between Location to the custom type. For further discussion please start a new thread.

 

[GMan]

It is always better to start a new thread.

You will need to create custom types and convert between Location to the custom type. For further discussion please start a new thread.

Hoi Erel,
it would be really great if the link to the new thread was published here.
Now i read 2 sides of comments and - now its broken 'cause i dont know for what to search for ,-)
Mayba a hint for further Board-Relaeses or so...

 

[jchal]

hi all
is it possible to convertme this example to a service runing in bacground at a spesifc interval e.g ever10 miniutes? so i can understand how it works?

 

[Erel]

Start with this tutorial: Service Modules

If you need more help then please start a new thread and upload your code.

 

[Erel]

The tutorial was updated. The GPS is now managed from the starter service and runtime permissions are used.

 

[Leni Berry]

I am getting this error while running the sample code. May i know where to find this "RuntimePermissions" ?
Thanks.


View attachment 45360

just tick runtimepermission library in library tab

 

[Declan]

When I try and load this example, I get the following error:

B4A version: 5.20
Parsing code. Error
Error parsing program.
Error description: Unknown type: runtimepermissions
Are you missing a library reference?
Occurred on line: 7 (Starter)
Public rp As RuntimePermissions

 

[Erel]

It requires B4A v6+.

With older versions of B4A you need to:
1. Set the targetSdkVersion to 19 (manifest editor).
2. Remove the RuntimePermissions and instead call:

CallSub(Starter, "StartGPS")

 

[Declan]

Many thanks, sorted
As always, support is Awesome - Anywhere Software has to be the most service/support orientated supplier.

 

[Tayfur]

@Erel ; where is RuntimePermissions or wich lib inculeded??

 

[Erel]

RuntimePermissions is included in B4A v6.0. You will need to remove this code if you are using an older version.

 

[Erel]

Example was updated.

The following line should be added to the manifest editor:

AddManifestText(<uses-feature android:name="android.hardware.location.gps"/>)

 

[Rusty]

I'm trying to compile the GPS example (post 1).
I'm using B4a 6.30 and it compiles and tries to install.
On my device (Samsung Galaxy S7), it merely states "App not installed."
Any ideas? (My manifest has the above (post 276) line in it.)
Thanks,
Rusty

 

[Erel]

Try to change the package name and run it again.

 

[Rusty]

I did. I changed it several different times with the same result.
Any other ideas?
All i'm trying to do is create a GPS Service. Are there other examples from which I can start?
Thanks!

 

[Erel]

Switching to USB debug mode instead of B4A-Bridge will give you more information about the installation error.