Hi Everyone, I wrote code of GPSTracker that giving correct coordinates but it not working first tim...

# compose

[Muhammad Zaryab Rafique]

Hi Everyone, I wrote code of GPSTracker that giving correct coordinates but it not working first time when location permission dialog appears it work second time when open app agian. Kindly see and tell me solution or how to fix it. I am very thankful.

[Gabriel Melo]

I suggest posting the code instead of prints of it. It's much easier to test and debug this way.

[Muhammad Zaryab Rafique]

Right Dear. I follow it next time. Thanks Dear

[Blaž Vantur]

You have an empty list for your coordinates and when you try to access the element on index 0 you get that error that is shown on the image. That happens in the MainContent function where you are accessing that list in this line of your code:
val locationCoordinates = Coordinates(cords[0].latitude, cords[0].longitude)

That happens because you have set an empty list as a default value for your coords list in MainComponent in this line of code:
val cords: List<Locator.Coordinate> by mainViewModel.myCords.observeAsState(listOf) .

I suggest for you to add if check before accessing elements from that list to prevent accessing an empty list.

[Muhammad Zaryab Rafique]

Thanks so much @Blaž Vantur for your great thinking about problem.

[Colton Idle]

https://kotlinlang.slack.com/archives/CJLTWPH7S/p1614355175421600

[Muhammad Zaryab Rafique]

Okay Dear @Adam Powell I understand and follow at next time.

[Muhammad Zaryab Rafique]

private var gpsTracker: GPSTracker? = null

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    Locator.requestPermissionLocation(this)
    gpsTracker = GPSTracker(applicationContext)

    setContent {
        RukuhTheme {
            Surface(color = MaterialTheme.colors.background) {
                App(gpsTracker!!)
            }
        }
    }
}

[Muhammad Zaryab Rafique]

@Composable
fun App(gpsTracker: GPSTracker) {
    val doubleLatitude: Double?
    val doubleLongitude: Double?
    doubleLatitude = gpsTracker.getLatitude()
    doubleLongitude = gpsTracker.getLongitude()
    if (doubleLatitude != 0.0 && doubleLongitude != 0.0)
        MainContent(doubleLatitude, doubleLongitude)
    else {
        Text(text = "Empty List")
    }
}