Flutter延迟深度链接问题：安装后获取推荐码与事件ID

Android: Fixing Install Referrer Retrieval #

If android_play_install_referrer didn’t work, verify your implementation with these steps:

• Add the package to pubspec.yaml:

  dependencies:
    android_play_install_referrer: ^latest_version
  

• Initialize and listen for the referrer in your splash screen or initial screen:

  import 'package:android_play_install_referrer/android_play_install_referrer.dart';
  
  @override
  void initState() {
    super.initState();
    _fetchInstallReferrer();
  }
  
  Future<void> _fetchInstallReferrer() async {
    try {
      final referrerDetails = await AndroidPlayInstallReferrer.installReferrer;
      if (referrerDetails != null) {
        // Parse the referrer string to extract your parameters
        final params = Uri.splitQueryString(referrerDetails.installReferrer);
        final referrerCode = params['REFERRERCODE'];
        final eventId = params['eventId'];
        
        // Use these values to continue the referral flow
        if (referrerCode != null && eventId != null) {
          // Save or process the referral data
        }
      }
    } catch (e) {
      // Handle errors (e.g., API unavailable on older Android versions)
    }
  }
  

• Critical note: The referrer is only retrieved once on the first app launch after installation. Test this by uninstalling the app, clicking your Play Store link, then reinstalling and launching.

iOS: Handling Referrals via Firebase Dynamic Links #

iOS doesn’t support passing referrer parameters directly through App Store links. Use Firebase Dynamic Links for a reliable cross-platform solution that works for both Android and iOS:

Step 1: Set Up Firebase Dynamic Links #

• Enable Dynamic Links in your Firebase project and configure your app’s bundle ID.
• Add the package to pubspec.yaml:

  dependencies:
    firebase_dynamic_links: ^latest_version
  

Step 2: Generate a Dynamic Link #

Create a link that includes your referral parameters. You can do this via the Firebase Console or programmatically:

final dynamicLinkParams = DynamicLinkParameters(
  uriPrefix: 'https://yourapp.page.link', // Replace with your Firebase prefix
  link: Uri.parse('https://yourapp.com/refer?referrerCode=$REFERRERCODE&eventId=$EVENTID'),
  androidParameters: AndroidParameters(
    packageName: 'com.yourapp.android',
    minimumVersion: 1,
  ),
  iosParameters: IosParameters(
    bundleId: 'com.yourapp.ios',
    minimumVersion: '1.0',
  ),
);
final shortLink = await dynamicLinkParams.buildShortLink();
final referralUrl = shortLink.shortUrl.toString();

Step 3: Retrieve Parameters in the App #

Listen for dynamic links when the app launches:

@override
void initState() {
  super.initState();
  _initDynamicLinks();
}

Future<void> _initDynamicLinks() async {
  // Check for initial link (app opened from link while closed)
  final initialLinkData = await FirebaseDynamicLinks.instance.getInitialLink();
  final deepLink = initialLinkData?.link;

  if (deepLink != null) {
    final referrerCode = deepLink.queryParameters['referrerCode'];
    final eventId = deepLink.queryParameters['eventId'];
    // Process referral data
  }

  // Listen for links while the app is open
  FirebaseDynamicLinks.instance.onLink.listen((linkData) {
    final deepLink = linkData.link;
    if (deepLink != null) {
      // Handle ongoing referral links
    }
  }).onError((error) {
    // Handle link errors
  });
}

Alternative: Custom Web Redirect (No Firebase) #

If you prefer not to use Firebase, build a simple web endpoint that:

1. Stores referral parameters (along with a device identifier like advertising ID or IP) when the user clicks the link.
2. Redirects the user to the appropriate app store.
3. When the app first launches, sends a request to your endpoint to retrieve the stored parameters using the same device identifier.

This requires backend development but gives you full control over the referral flow.

内容的提问来源于stack exchange，提问作者Siddhesh Kumbhar