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#multiplatform
Title
# multiplatform
m

Michael Paus

06/23/2022, 3:20 PM
Is there already any multiplatform solution to show a location on an external map. Something that you would do in Android via https://developers.google.com/maps/documentation/urls/android-intents
a

Alejandro Moya

06/23/2022, 3:24 PM
that’s platform specific, I don’t think that there will be anything like that available in multiplatform
you can create a method on each platform to do that and have an expect on the commonMain, that way you’ll be able to do it
m

Michael Paus

06/23/2022, 4:23 PM
If I can do it via expect/actual then anybody could have already done it and that’s what I was asking for. Just trying to avoid duplicate work. (Besides I don’t know how to do that on iOS.)
a

Alejandro Moya

06/23/2022, 4:31 PM
Copy code
fun openMaps(lat: Long, lon: Long) {
    if (UIApplication.sharedApplication.canOpenURL(
            NSURL.URLWithString("comgooglemaps://")!!)
    ) {
        UIApplication.sharedApplication.openURL(
            NSURL.URLWithString(
                "comgooglemaps://?saddr=&daddr=$lat,$lon&directionsmode=driving"
            )!!
        )
    }
}
that would be the ios implementation on multiplatform, I would first check if there’s access to the shared application from the library
@Michael Paus I’ve been reading and you can’t access the app from a framework on ios, I think the same applies to android, this means you should pass the application object on ios and the context on android, you can achieve this by using typealias and create a common 
ApplicationObject
type
Copy code
actual typealias APPObject = UIApplication

fun openMaps(appObject: APPObject, lat: Long, lon: Long) {
    if (appObject.canOpenURL(
            NSURL.URLWithString("comgooglemaps://")!!)
    ) {
        appObject.openURL(
            NSURL.URLWithString(
                "comgooglemaps://?saddr=&daddr=$lat,$lon&directionsmode=driving"
            )!!
        )
    }
}
that would be the ios implementation
m

Michael Paus

06/23/2022, 5:41 PM
@Alejandro Moya Many thanks. I’ll give that a try as soon as I can.
👍 1
Ohh, I just realize that this solution will probably not be usable in general. If I understand the docs correctly this would require the user to have the Google Maps app pre-installed on the device, right? My original question was “… to show a location on an external map.” and I gave the Google Maps example because that is what you would use on Android. On iOS I would instead use whatever is normally used to show a map on such a device without having anything specific being pre-installed by the user. Sorry for the confusion. 😢
a

Alejandro Moya

06/23/2022, 6:06 PM
that’s the reference for apple maps
something like 
"<http://maps.apple.com/?ll=$lat,$lon>"
m

Michael Paus

06/23/2022, 6:09 PM
Ahh, so the code above remains the same and only the URL changes, right?
a

Alejandro Moya

06/23/2022, 6:10 PM
Copy code
fun openMaps(appObject: APPObject, lat: Float, lon: Float) {
    if (appObject.canOpenURL(
            NSURL.URLWithString("<http://maps.apple.com/>")!!)
    ) {
        appObject.openURL(
            NSURL.URLWithString(
                "<http://maps.apple.com/?ll=$lat,$lon>"
            )!!
        )
    }
}
👍 1
fixed the lat and lon types as they will be Float
m

Michael Paus

06/24/2022, 8:54 AM
It works. With the click of a button I can move to the iOS map at the given location in a multiplatform app.
One question remains though. How can I get back to my app after I am done with the map?
a

Alejandro Moya

06/24/2022, 12:46 PM
that’s regular iOS navigation, the person will switch apps to go back, same as with android
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