Remove decide later button in explainer dialog

README.md

@@ -1,5 +1,7 @@
 # app_tracking_transparency
 
+[![pub package](https://img.shields.io/pub/v/app_tracking_transparency.svg)](https://pub.dev/packages/app_tracking_transparency)
+
 This Flutter plugin allows you to display ios 14+ tracking authorization dialog and request permission to collect data. Collected data is crucial for ad networks (ie admob) to work efficiently on ios 14+ devices.
 
 ## Introduction
@@ -40,24 +42,22 @@ final status = await AppTrackingTransparency.requestTrackingAuthorization();
 // FirebaseAdMob.instance.initialize(...)
 ```
 
-You can also show a custom explainer dialog before the system dialog if you want.
+Google (admob) recommends implementing an explainer message that appears to users immediately before the consent dialogue. For additional info on this topic please refer to this article: https://support.google.com/admob/answer/9997589?hl=en
 ```dart
-try {
-  // If the system can show an authorization request dialog
-  if (await AppTrackingTransparency.trackingAuthorizationStatus ==
-      TrackingStatus.notDetermined) {
-    // Show a custom explainer dialog before the system dialog
-    await showCustomTrackingDialog(context);
-    // Wait for dialog popping animation
-    await Future.delayed(const Duration(milliseconds: 200));
-    // Request system's tracking authorization dialog
-    await AppTrackingTransparency.requestTrackingAuthorization();
-  }
-} on PlatformException {
-  // Unexpected exception was thrown
+// If the system can show an authorization request dialog
+if (await AppTrackingTransparency.trackingAuthorizationStatus ==
+    TrackingStatus.notDetermined) {
+  // Show a custom explainer dialog before the system dialog
+  await showCustomTrackingDialog(context);
+  // Wait for dialog popping animation
+  await Future.delayed(const Duration(milliseconds: 200));
+  // Request system's tracking authorization dialog
+  await AppTrackingTransparency.requestTrackingAuthorization();
 }
 ```
 
+The explainer dialog must not contain a "Decide later" button. It should contain only a "Continue" button and the system dialog must be shown after the explainer dialog. [See this issue for details](https://github.com/deniza/app_tracking_transparency/issues/27).
+
 You can also get advertising identifier after authorization. Until a user grants authorization, the UUID returned will be all zeros: 00000000-0000-0000-0000-000000000000. Also note, the advertisingIdentifier will be all zeros in the Simulator, regardless of the tracking authorization status.
 ```dart
 final uuid = await AppTrackingTransparency.getAdvertisingIdentifier();
@@ -66,8 +66,6 @@ final uuid = await AppTrackingTransparency.getAdvertisingIdentifier();
 ## Notes
 To use this plugin you should compile your project using XCode 12 and run your app on an ios 14 device.
 
-Google (admob) recommends implementing an explainer message that appears to users immediately before the consent dialogue. For additional info on this topic please refer to this article: <https://support.google.com/admob/answer/9997589?hl=en>
-
 ## Important Notice
 
 IOS does not allow to display multiple native dialogs. If you try to open a native dialog when there is already a dialog on screen, previous dialog will be forcefully closed by the system. It's very common to show notification permission dialog on the first run of an ios application. If you both try to show a notification permission dialog and app tracking request dialog, one of the each will be cancelled. One way to handle this is using an explainer dialog before requesting tracking authorization. Please check the sample project for more on this. I highly recommend this approach.

example/lib/main.dart

@@ -1,9 +1,17 @@
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 import 'package:app_tracking_transparency/app_tracking_transparency.dart';
 
 void main() {
-  runApp(MaterialApp(home: HomePage()));
+  runApp(MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: HomePage(),
+    );
+  }
 }
 
 class HomePage extends StatefulWidget {
@@ -17,38 +25,32 @@ class _HomePageState extends State<HomePage> {
   @override
   void initState() {
     super.initState();
-    // Can't show a dialog in initState, delaying initialization
-    WidgetsBinding.instance!.addPostFrameCallback((_) => initPlugin());
+    initPlugin();
   }
 
   // Platform messages are asynchronous, so we initialize in an async method.
   Future<void> initPlugin() async {
-    // Platform messages may fail, so we use a try/catch PlatformException.
-    try {
+    final TrackingStatus status =
+        await AppTrackingTransparency.trackingAuthorizationStatus;
+    setState(() => _authStatus = '$status');
+    // If the system can show an authorization request dialog
+    if (status == TrackingStatus.notDetermined) {
+      // Show a custom explainer dialog before the system dialog
+      await showCustomTrackingDialog(context);
+      // Wait for dialog popping animation
+      await Future.delayed(const Duration(milliseconds: 200));
+      // Request system's tracking authorization dialog
       final TrackingStatus status =
-          await AppTrackingTransparency.trackingAuthorizationStatus;
+          await AppTrackingTransparency.requestTrackingAuthorization();
       setState(() => _authStatus = '$status');
-      // If the system can show an authorization request dialog
-      if (status == TrackingStatus.notDetermined) {
-        // Show a custom explainer dialog before the system dialog
-        await showCustomTrackingDialog(context);
-        // Wait for dialog popping animation
-        await Future.delayed(const Duration(milliseconds: 200));
-        // Request system's tracking authorization dialog
-        final TrackingStatus status =
-            await AppTrackingTransparency.requestTrackingAuthorization();
-        setState(() => _authStatus = '$status');
-      }
-    } on PlatformException {
-      setState(() => _authStatus = 'PlatformException was thrown');
     }
 
     final uuid = await AppTrackingTransparency.getAdvertisingIdentifier();
     print("UUID: $uuid");
   }
 
-  Future<bool> showCustomTrackingDialog(BuildContext context) async =>
-      await showDialog<bool>(
+  Future<void> showCustomTrackingDialog(BuildContext context) async =>
+      await showDialog<void>(
         context: context,
         builder: (context) => AlertDialog(
           title: const Text('Dear User'),
@@ -59,13 +61,12 @@ class _HomePageState extends State<HomePage> {
           ),
           actions: [
             TextButton(
-              onPressed: () => Navigator.pop(context, true),
-              child: const Text("Continue"),
+              onPressed: () => Navigator.pop(context),
+              child: const Text('Continue'),
             ),
           ],
         ),
-      ) ??
-      true;
+      );
 
   @override
   Widget build(BuildContext context) {

lib/app_tracking_transparency.dart

@@ -33,12 +33,11 @@ class AppTrackingTransparency {
   /// if (await AppTrackingTransparency.trackingAuthorizationStatus ==
   ///     TrackingStatus.notDetermined) {
   ///   // Show a custom explainer dialog before the system dialog
-  ///   if (await showCustomTrackingDialog(context)) {
-  ///     // Wait for dialog popping animation
-  ///     await Future.delayed(const Duration(milliseconds: 200));
-  ///     // Request system's tracking authorization dialog
-  ///     await AppTrackingTransparency.requestTrackingAuthorization();
-  ///   }
+  ///   await showCustomTrackingDialog(context);
+  ///   // Wait for dialog popping animation
+  ///   await Future.delayed(const Duration(milliseconds: 200));
+  ///   // Request system's tracking authorization dialog
+  ///   await AppTrackingTransparency.requestTrackingAuthorization();
   /// }
   /// ```
   ///