[Android] 11.0.0 build fails — cannot find symbol FilePickerPlugin (missing kotlin-android plugin)

[mfurkanyuceal]

Description

Upgrading to file_picker: 11.0.0 causes an Android build failure. The GeneratedPluginRegistrant.java cannot resolve FilePickerPlugin because the Kotlin Android plugin is not applied in the package's android/build.gradle.

This is the same root cause as the regression in 10.3.9 (fixed in 10.3.10), but the fix was not carried into the 11.0.0 release.

Related: #1952 (maintainer requested a new issue in this comment)

Error

GeneratedPluginRegistrant.java:64: error: cannot find symbol
    flutterEngine.getPlugins().add(new com.mr.flutter.plugin.filepicker.FilePickerPlugin());
                                                                       ^
  symbol:   class FilePickerPlugin
  location: package com.mr.flutter.plugin.filepicker
1 error

FAILURE: Build failed with an exception.
Execution failed for task ':app:compileDebugJavaWithJavac'.

Root Cause

file_picker 11.0.0's android/build.gradle applies only com.android.library but does not apply kotlin-android. All Android source files are Kotlin (.kt), so without this plugin Gradle never compiles them — the Java-side GeneratedPluginRegistrant then fails to find the class.

11.0.0 (build.gradle):

apply plugin: 'com.android.library'
// ❌ missing: apply plugin: 'kotlin-android'

10.3.10 (build.gradle) — working:

apply plugin: 'com.android.library'
apply plugin: 'org.jetbrains.kotlin.android'  // ✅

Steps to Reproduce

1. Set file_picker: 11.0.0 in pubspec.yaml
2. Run flutter clean && flutter pub get
3. Run flutter run targeting an Android device
4. Build fails at :app:compileDebugJavaWithJavac

Downgrading to 10.3.10 resolves the issue immediately.

Environment

• Flutter: 3.41.0 (Dart SDK 3.11.1)
• file_picker: 11.0.0
• AGP: 8.13.0
• Kotlin: 2.2.20
• Gradle: (via Flutter)
• Java: 17
• OS: macOS Darwin 25.4.0
• Device: Samsung SM-M215F (Android, debug mode)

Suggested Fix

Add the missing Kotlin plugin to android/build.gradle:

  apply plugin: 'com.android.library'
+ apply plugin: 'org.jetbrains.kotlin.android'

And optionally restore kotlinOptions:

kotlinOptions {
    jvmTarget = JavaVersion.VERSION_17.toString()
}

[kingdomseed]

Having the same issue.

[Livinglist]

Having the same issue.

[selvam920]

having the same issue

[vicajilau]

We apologize for the issues this is causing. This is happening because version 11.0.0 was migrated to AGP 9. We thought that version was backward compatible, but we’re finding that it isn’t. We’re currently looking for the best way to fix this and will release a hotfix later today.

[vicajilau]

Version 11.0.1, which includes a fix for this issue, has now been released. We hope this does not happen to any users again, and thank you very much for your patience!!

[Jazzin]

I am still seeing this issue. I am using version 11.0.2 and gradle 9.1.1. If I revert to gradle 8.13.0 it works fine.

I've done all the standard cache clearing stuff, but I still get the error...

error: cannot find symbol flutterEngine.getPlugins().add(new com.mr.flutter.plugin.filepicker.FilePickerPlugin());