In a multi-activity app, the plugin doesn't reattach to the first activity

[MElkady]

• I have read the README
• I have already searched for the same problem
• I have read and done the setup for Android: IMPORTANT Note for Android and iOS and IMPORTANT Note for Android
• I have read and done the setup for iOS: IMPORTANT Note for Android and iOS and IMPORTANT Note for iOS
• I have ran the sample app and it does not work there

Environment

Technology	Version
Flutter version	1.22.6
Plugin version	4.0.0+4
Android version	10
iOS version	Not relevant
Xcode version	Not relevant

Device information: Samsung Galaxy S8

Description

In an application that consists of multiple flutter activities. The plugin attaches only to the topmost activity. After that activity finishes, Shared.activity will become null & none of the other activities can use the plugin

Steps to reproduce

1. Create a flutter application with flutter_inappwebview plugin
2. Then add an additional FlutterActivity (I do that to start a special routine for some use cases)
3. Then build and run the app
4. Then open the main activity (then Shared.activity will point to the main activity)
5. Then open the 2nd activity (then Shared.activity will point to the 2nd activity)
6. Return to the main activity & try to open the wevbiew
7. Notice that it doesn't work & a null pointer exception is thrown

Stacktrace/Logcat

[ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: PlatformException(error, Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference, null, java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
        at com.pichillilorenzo.flutter_inappwebview.ChromeSafariBrowserManager.open(ChromeSafariBrowserManager.java:66)
        at com.pichillilorenzo.flutter_inappwebview.ChromeSafariBrowserManager.onMethodCall(ChromeSafariBrowserManager.java:49)
        at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:233)
        at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
        at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:692)
        at android.os.MessageQueue.nativePollOnce(Native Method)
        at android.os.MessageQueue.next(MessageQueue.java:326)
        at android.os.Looper.loop(Looper.java:181)
        at android.app.ActivityThread.main(ActivityThread.java:7050)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:965)

[pichillilorenzo]

Did you try the latest version of the plugin and the latest of flutter?? Version 4 is not supported anymore.

However, the plugin already implements the ActivityAware flutter interface and support the onAttachedToActivity and onReattachedToActivityForConfigChanges events (just check the Android InAppWebViewFlutterPlugin.java class).
So, I don't know if you need to do something more specific when you move from one Android FlutterActivity to another, but this should already work (I think). It could be also a Flutter issue.
Also, could you create a simple project with that scenario? Thanks.

[no-response]

This issue has been automatically closed because it was marked as "answered", and there wasn't any recent activity on this issue.

[pichillilorenzo]

I was able to reproduce the error! The fix should come with the next release!

[pichillilorenzo]

Fixed with new release 5.3.0!

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug and a minimal reproduction of the issue.