AppLink isn't working in Flutter application in debug mode even though the assetlinks are verified and valid

Question

I have been trying to implement AppLink in my Flutter application for android which is currently in development/debug mode, but the AppLink doesn't work. When I hit the URL through browser in my mobile which is running the Flutter application in debug/development mode, the app doesn't opens. I suppose there is some problem inside the Flutter app implementation.

Steps I have tried

Created the assetlinks.json file and added the following details:

  [
    {
      "relation": [
        "delegate_permission/common.handle_all_urls"
      ],
      "target": {
        "namespace": "android_app",
        "package_name": "com.foxjek.fox_jek_user",
        "sha256_cert_fingerprints": [
         "73:EA:74:0C:B4:6B:99:37:C0:CF:B9:BD:54:EB:2C:51:04:5A:3A:6A:0E:64:0B:27:B8:73:B2:51:4B:B3:CE:F9"
        ]
      }
    }
  ]

And uploaded it on the server on the root directory under the folder .well-known and tested through the Google Digital Asset Links and the Test is success.
Now I have installed the uni_link 0.5.1 library for AppLinking implementation by following the steps defined here

After that I have followed the following steps to setup everything:

Here is my AndroidManifest.xml file under the android/app/src/main directory. Inside the <activity> tag (usually named MainActivity), I have added the <intent-filter> element:

   <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="com.foxjek.fox_jek_user">

       <uses-permission android:name="android.permission.INTERNET" />
       <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
       <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
       <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
       <uses-permission android:name="android.permission.READ_CONTACTS" />

       <uses-feature android:name="android.hardware.location.gps" />
       <uses-feature
           android:glEsVersion="0x00020000"
           android:required="true" />

       <!-- Provide required visibility configuration for API level 30 and above -->
       <queries>

           <intent>
               <action android:name="android.intent.action.VIEW" />
               <data android:scheme="sms" />
           </intent>
           <!-- If your app makes calls -->
           <intent>
               <action android:name="android.intent.action.DIAL" />
               <data android:scheme="tel" />
           </intent>


           <!-- If your app emails -->
           <intent>
               <action android:name="android.intent.action.SEND" />
               <data android:mimeType="*/*" />
           </intent>
           <!-- If your sends SMS messages -->
           <intent>
               <action android:name="android.intent.action.SENDTO" />
               <data android:scheme="smsto" />
           </intent>
           <intent>
               <action android:name="android.media.action.IMAGE_CAPTURE" />
           </intent>

           <package android:name="com.facebook.katana" />
       </queries>

       <application
           android:name="androidx.multidex.MultiDexApplication"
           android:icon="@mipmap/ic_launcher"
           android:label="@string/app_name"
           android:roundIcon="@mipmap/ic_launcher_round"
           android:supportsRtl="true"
           android:usesCleartextTraffic="true">
           <receiver
               android:name="com.dexterous.flutterlocalnotifications.ScheduledNotificationBootReceiver"
               android:exported="false">
               <intent-filter>
                   <action android:name="android.intent.action.BOOT_COMPLETED" />
               </intent-filter>
           </receiver>
           <receiver
               android:name="com.dexterous.flutterlocalnotifications.ScheduledNotificationReceiver"
               android:exported="false" />


           <meta-data
               android:name="com.google.android.gms.version"
               android:value="@integer/google_play_services_version" />

           <meta-data
               android:name="com.google.firebase.messaging.default_notification_channel_id"
               android:value="high_importance_channel" />
           <meta-data
               android:name="com.google.firebase.messaging.default_notification_icon"
               android:resource="@drawable/ic_notification" />
           <meta-data
               android:name="com.google.firebase.messaging.default_notification_color"
               android:resource="@color/colorPrimary" />

           <meta-data
               android:name="com.google.android.geo.API_KEY"
               android:value="@string/google_api_key" />

           <meta-data
               android:name="com.facebook.sdk.ApplicationId"
               android:value="@string/facebook_app_id" />

           <meta-data
               android:name="com.facebook.sdk.ClientToken"
               android:value="@string/facebook_client_token" />

           <activity
               android:name="com.facebook.FacebookActivity"
               android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
               android:exported="false"
               android:label="@string/app_name" />
           <activity
               android:name="com.facebook.CustomTabActivity"
               android:exported="true">
               <intent-filter>
                   <action android:name="android.intent.action.VIEW" />

                   <category android:name="android.intent.category.DEFAULT" />
                   <category android:name="android.intent.category.BROWSABLE" />

                   <data android:scheme="@string/fb_login_protocol_scheme" />
               </intent-filter>
           </activity>

           <!--<provider android:authorities="com.facebook.app.FacebookContentProvider2226807840719365"
               android:name="com.facebook.FacebookContentProvider"
               android:exported="true" />-->
           <activity
               android:name="com.yalantis.ucrop.UCropActivity"
               android:screenOrientation="portrait"
               android:theme="@style/Theme.AppCompat.Light.NoActionBar" />

           <activity
               android:name=".MainActivity"
               android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
               android:exported="true"
               android:hardwareAccelerated="true"
               android:launchMode="singleTop"
               android:showWhenLocked="true"
               android:theme="@style/LaunchTheme"
               android:turnScreenOn="true"
               android:windowSoftInputMode="adjustResize">

               <meta-data
                   android:name="io.flutter.embedding.android.NormalTheme"
                   android:resource="@style/NormalTheme" />

               <intent-filter>
                   <action android:name="FLUTTER_NOTIFICATION_CLICK" />
                   <category android:name="android.intent.category.DEFAULT" />
               </intent-filter>

               <meta-data
                   android:name="io.flutter.embedding.android.SplashScreenDrawable"
                   android:resource="@drawable/launch_background" />
               <intent-filter>
                   <action android:name="android.intent.action.MAIN" />
                   <category android:name="android.intent.category.LAUNCHER" />
               </intent-filter>
               <!-- App Links -->
               <intent-filter android:autoVerify="true">
                   <action android:name="android.intent.action.VIEW" />
                   <category android:name="android.intent.category.DEFAULT" />
                   <category android:name="android.intent.category.BROWSABLE" />
                   <!-- Accepts URIs that begin with https://YOUR_HOST -->
                   <data
                       android:scheme="https"
                       android:host="user-api.slim-surface-app.com" />
               </intent-filter>

           </activity>

           <meta-data
               android:name="flutterEmbedding"
               android:value="2" />
       </application>


   </manifest>

Dart code updated as:

   void main() {
     runApp(const MyApp());
     initUniLinks();
   }
   void initUniLinks() async {
     // Initialize the UniLinks plugin
     print("Initialize the UniLinks plugin");
     try {
       await getInitialLink();
     } on PlatformException {
       // Handle exception/error as needed
       print("Handle exception/error as needed");
     }

     // Listen for incoming deep links
     // Attach a listener to the stream
     print("Listen for incoming deep links");
     linkStream.listen((String? uri) {
       // Handle the deep link URI
       print("Handle the deep link URI");
       print(uri);


     } , onError: (err) {
       // Handle error, if any
       print("Handle error, if any");
     });
   }

rebuild and reinstall Flutter app on the device for the updates to take effect.

But, now when I hit the domain your-domain.com in browser in device, the same device which is running the Flutter app in debug mode, the device don't identify the DeepLink/AppLink to open the app.

What I'm Expecting

Whenever I open the your-domain.com in my mobile browser the same mobile which is running th Flutter application in debug mode should redirect it to Flutter app and should open the app quickly.

score 0 · Answer 1 · answered Aug 30 '23 at 15:02

You can test the app by running this command https://docs.flutter.dev/cookbook/navigation/set-up-app-links

adb shell 'am start -a android.intent.action.VIEW \
    -c android.intent.category.BROWSABLE \
    -d "http://<web-domain>/details"' \
    <package name>

AppLink isn't working in Flutter application in debug mode even though the assetlinks are verified and valid

Steps I have tried

What I'm Expecting

1 Answers1