Authenticate in multiple activities

[KoheiYamashita]

Describe the bug

Our app has two activities implemented: ActivityA and ActivityB. When executing the authenticate function in ActivityB, it redirects to ActivityA.

To Reproduce

Steps to reproduce the behavior:

1. Launch the ActivityB.
2. Execute the authenticate function.
3. Observe the redirect to ActivityA.

Expected behavior

Redirect to the Activity that performed the authenticate.

Screenshots

Not applicable.

Device

• Device: Pixcel7Pro
• OS: Android13
• Browser: Chrome
• flutter_web_auth_2 version: 2.1.2

Additional context

ActivityA has the following intent-filter:

<intent-filter>
  <action android:name="android.intent.action.MAIN"/>
  <category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>

This filter is used to launch the main screen of the app.

ActivityB is set up to receive text data with the following intent-filter:

<intent-filter>
  <action android:name="android.intent.action.SEND"/>
  <category android:name="android.intent.category.DEFAULT"/>
  <data android:mimeType="text/plain"/>
</intent-filter>

CallbackActivity is defined as follows.

<activity
    android:name="com.linusu.flutter_web_auth_2.CallbackActivity"
    android:exported="true">
        <intent-filter android:label="flutter_web_auth_2">
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />
            <data android:scheme="com.example.oauth" android:host="callback" />
          </intent-filter>
</activity>

Checklist

• [x] I have read and followed the entire troubleshooting guide and it has not provided the solution I need.
• [x] I have provided all the information I can (incl. auth URL etc.)

[ThexXTURBOXx]

Thanks for reporting the bug, I will take a look at it soon

[KoheiYamashita]

Hello. I'm currently checking how to use it, and it seems that using ActivityAware allows you to obtain the associated Activity. https://api.flutter.dev/javadoc/io/flutter/embedding/engine/plugins/activity/ActivityAware.html I hope this helps with your analysis!

[ThexXTURBOXx]

Does the issue persist when you remove the DEFAULT category from the intent filter of ActivityB?

[KoheiYamashita]

Thank you for your suggestion. The android.intent.category.DEFAULT is necessary for receiving implicit Intent. I believe that if you do not set this, it will not be displayed on the shared screen.

https://developer.android.com/guide/topics/manifest/category-element

[ThexXTURBOXx]

In that case, I am unsure if I can fix this issue since flutter_web_auth_2 does not initiate a redirect to any activity as can be seen in these two files:

• https://github.com/ThexXTURBOXx/flutter_web_auth_2/blob/master/flutter_web_auth_2/android/src/main/kotlin/com/linusu/flutter_web_auth_2/CallbackActivity.kt
• https://github.com/ThexXTURBOXx/flutter_web_auth_2/blob/master/flutter_web_auth_2/android/src/main/kotlin/com/linusu/flutter_web_auth_2/FlutterWebAuth2Plugin.kt

When initiating the authenticate, a custom tabs intent is being launched. When the callback URL scheme is detected, the callback activity will be called which then just finishes and leaves you with the original activity which had launched the authenticate process. There must be something wrong in your setup, I think (maybe ActivityB launches in the background for some reason?)

[KoheiYamashita]

Thank you very much. After trying various things like changing the launchMode, it seems that it was being redirected to the main task. I guess this is probably the standard behavior of the plugin. I will let you know if I find a workaround, but for now, I'm thinking of closing this issue. Is that okay?

[ThexXTURBOXx]

No problem! If you find some workaround, please let me know. Then I can extend the troubleshooting guide. Thank you very much!