Question

MapBox和Kotlin的入门者。在启用位置权限后首次安装APK时，我的LocationComponent不会激活，也不会显示在地图上。该应用程序将崩溃，并且位置组件将正常显示，并且该应用程序将按预期运行。

在启用位置权限后，任何人都可以提供一些帮助来使我的LocationComponent激活并显示吗？

干杯！

2020-01-17 14:38:16.768 16702-16702/com.example.carparker E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.carparker, PID: 16702
com.mapbox.mapboxsdk.location.LocationComponentNotInitializedException: The LocationComponent has to be activated with one of the LocationComponent#activateLocationComponent overloads before any other methods are invoked.
    at com.mapbox.mapboxsdk.location.LocationComponent.checkActivationState(LocationComponent.java:1606)
    at com.mapbox.mapboxsdk.location.LocationComponent.getLastKnownLocation(LocationComponent.java:1030)
    at com.example.carparker.MainActivity.centreCamera(MainActivity.kt:176)
    at com.example.carparker.MainActivity$onCreate$4.onClick(MainActivity.kt:125)
    at android.view.View.performClick(View.java:6294)
    at android.view.View$PerformClick.run(View.java:24770)
    at android.os.Handler.handleCallback(Handler.java:790)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6494)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

fun onCreate() {
       mapView = findViewById(R.id.mapView)
        parkButton = findViewById(R.id.parkBtn)
    mapView.onCreate(savedInstanceState)
    mapView?.getMapAsync {mapboxMap ->
        map = mapboxMap
        map.setStyle(Style.MAPBOX_STREETS) {
            Log.d(TAG, "Enable location component")

                enableLocation()
                enableLocationComponent(it)
        }


    /**
 * Enables permissions for location
 */
fun enableLocation()  {
    if (PermissionsManager.areLocationPermissionsGranted(this)) {


    } else {
        permissionManager = PermissionsManager(this)
        permissionManager.requestLocationPermissions(this)
    }

}

   /**
     * Actions enable location again
     */
override fun onPermissionResult(granted: Boolean) {
    if (granted) {

        enableLocation()

    }
}

/**
 * Enables user tracking and displaying the location puck.
 */
private fun enableLocationComponent(loadedMapStyle: Style) {
        // Check if permissions are enabled and if not request
        if (PermissionsManager.areLocationPermissionsGranted(this)) {

            // Create and customize the LocationComponent's options
            val customLocationComponentOptions = LocationComponentOptions.builder(this)
                .trackingGesturesManagement(true)
                .accuracyColor(ContextCompat.getColor(this, R.color.mapbox_blue))

                .build()

            val locationComponentActivationOptions = LocationComponentActivationOptions.builder(this, loadedMapStyle)
                .locationComponentOptions(customLocationComponentOptions)
                .build()



                // Get an instance of the LocationComponent and then adjust its settings
            map.locationComponent.apply {

                    // Activate the LocationComponent with options
                    activateLocationComponent(locationComponentActivationOptions)

                    // Enable to make the LocationComponent visible
                    isLocationComponentEnabled = true

                    // Set the LocationComponent's camera mode
                    cameraMode = CameraMode.TRACKING


                    // Set the LocationComponent's render mode
                    renderMode = RenderMode.COMPASS


                }

        } else {
            permissionManager = PermissionsManager(this)
            permissionManager.requestLocationPermissions(this)
        }
    }

Answer 1

您要复制很多权限检查和初始化。

有关如何进行基本LocationComponent设置的准系统Kotlin示例，请参见https://github.com/mapbox/mapbox-android-demo/blob/master/MapboxAndroidDemo/src/main/java/com/mapbox/mapboxandroiddemo/examples/location/KotlinLocationComponentActivity.kt。

首次安装时位置许可和LocationComponent崩溃的应用程序

1 个答案: