Android Release build with minifyEnabled True is breaking in_app_webview

[arnaudelub]

Environment

**Flutter version: Flutter 1.12.13+hotfix.8
**Plugin version: Master branch

Description

Expected behavior:
initialOptions should be set when running in release mode

Current behavior:
options.crossplatform.useShouldOverrideUrlLoading = null even if set to true in the initialOptions.

Steps to reproduce

1. set minifyEnabled true in android/app/build.gradle:

buildTypes {
  release {
    minifyEnabled true
  }
}

in the inappwebview widget add in initialOptions:

useShouldOverrideUrlLoading: true,

and add :

shouldOverrideUrlLoading: (InAppWebViewController controller,
             ShouldOverrideUrlLoadingRequest request) async {
           print("Override available: ${request.url}");
          return ShouldOverrideUrlLoadingAction.ALLOW;
},

2. Then run flutter run --release
3. shouldOverrideUrlLoading will never been called because useShouldOverrideUrlLoading is null

If minifyEnabled is set to false, it works as expected

Update

Same issue when using :

• flutter build appbundle
  Using:
  flutter build appbundle --no-shrink solves the problem, seems like R8 is messing with something.
  doc: flutter.dev

[arnaudelub]

duplicate of #294

There is actually a pull request to fix it on branch a7100ae
you can use:

flutter_inappwebview:
    git:
      url: https://github.com/pichillilorenzo/flutter_inappwebview
      ref: a7100ae

The other workaround is to search for missing classes in logcat and add them to a proguard file

[github-actions]

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