healthcare-doctor/lib/maps/location_controller.dart

import 'dart:developer';
import 'dart:ui' as ui;

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:location/location.dart';

import 'app_images.dart';
import 'app_sizes.dart';
import 'permission_alert.dart';

class LocationController<T> extends GetxController {
  Location location = Location();

  // final Rx<LatLng?> locationPosition = const LatLng(0.0, 0.0).obs;
  /*final Rx<LatLng?> locationPosition =
      const LatLng(12.90618717, 77.5844983).obs;*/
  final Rx<LatLng?> locationPosition =
      const LatLng(0, 0).obs;

  bool locationServiceActive = true;

  BitmapDescriptor? pickupMarker;
  BitmapDescriptor? dropMarker;

  @override
  void onInit() async {

    await _getBytesFromAsset(AppImages.pickupMarker, AppSizes.mapPinSize * 0.1);
    await _getBytesFromAsset(AppImages.dropMarker, AppSizes.mapPinSize * 0.05);

    super.onInit();
    refreshToLiveLocation();
  }

  Future<void> _getBytesFromAsset(String path, double size) async {
    ByteData data = await rootBundle.load(path);
    ui.Codec codec = await ui.instantiateImageCodec(
      data.buffer.asUint8List(),
      targetWidth: size.toInt(),
      allowUpscaling: true,
    );
    ui.FrameInfo fi = await codec.getNextFrame();
    if (path == AppImages.pickupMarker) {
      pickupMarker = BitmapDescriptor.fromBytes(
          (await fi.image.toByteData(format: ui.ImageByteFormat.png))!
              .buffer
              .asUint8List());
    } else if (path == AppImages.dropMarker) {
      dropMarker = BitmapDescriptor.fromBytes(
          (await fi.image.toByteData(format: ui.ImageByteFormat.png))!
              .buffer
              .asUint8List());
    } else {}
  }

  refreshToLiveLocation() async {
    log("initiating");
    bool serviceEnabled;

    PermissionStatus permissionGranted;

    serviceEnabled = await location.serviceEnabled();

    if (!serviceEnabled) {
      serviceEnabled = await location.requestService();
      locationPosition.value = null;
      return;
    }
    log("permission check");
    permissionGranted = await location.hasPermission();

    if (permissionGranted == PermissionStatus.denied) {
      permissionGranted = await location.requestPermission();
      if (permissionGranted != PermissionStatus.granted) {
        showPermissionAlertDialog(
          requestMsg:
          "Location access needed. Go to Android settings, tap App permissions and tap Allow.",
          barrierDismissible: false,
        );
      } else {
        await location.changeSettings(
            accuracy: LocationAccuracy.high,
            interval: 2000,
            distanceFilter: 2);

        location.onLocationChanged.listen((LocationData currentLocation) async {
          var lat = currentLocation.latitude;
          var long = currentLocation.longitude;
          if (lat != null && long != null) {
            locationPosition.value = LatLng(
              lat,
              long,
            );
            log("live location ${locationPosition.value}");
          }
        });
      }
    } else {
      await location.changeSettings(
          accuracy: LocationAccuracy.high,
          interval: 2000,
          distanceFilter: 2);

      location.onLocationChanged.listen((LocationData currentLocation) async {
        var lat = currentLocation.latitude;
        var long = currentLocation.longitude;
        if (lat != null && long != null) {
          locationPosition.value = LatLng(
            lat,
            long,
          );
          log("live location ${locationPosition.value}");
        }
      });
    }
  }
}