Flutter SDK: Dart とネイティブのブリッジング

import 'package:tracelet/tracelet.dart' as tl;
 
void initializeTracking() async {
  // 1. Listen to events in the UI
  tl.Tracelet.onLocation((tl.Location location) {
    print('Update UI map marker: ${location.coords.latitude}, ${location.coords.longitude}');
  });
 
  tl.Tracelet.onMotionChange((tl.Location location) {
    print('User started/stopped moving: ${location.isMoving}');
  });
 
  // 2. Start the native engine
  await tl.Tracelet.ready(tl.Config.balanced());
  await tl.Tracelet.start();
}

import 'package:tracelet/tracelet.dart' as tl;
 
// 1. Check current status
final status = await tl.Tracelet.requestLocationAuthorization();
 
// 2. The user permanently denied permission in the past
if (status == tl.AuthorizationStatus.deniedForever) {
  // Show a beautifully designed Flutter dialog explaining WHY you need it.
  // Add a button that calls:
  await tl.Tracelet.openAppSettings();
  return;
}
 
// 3. We haven't asked yet, or they selected "Ask Next Time"
if (status == tl.AuthorizationStatus.notDetermined || status == tl.AuthorizationStatus.denied) {
  // Ask for foreground permission first
  final result = await tl.Tracelet.requestLocationAuthorization(); 
  
  if (result == tl.AuthorizationStatus.whenInUse) { // They granted "When In Use"
    // Show a second Flutter dialog explaining why "Always" is needed.
    // Then upgrade the permission:
    await tl.Tracelet.requestLocationAuthorization(); 
  }
}