dart中“multi_image_picker”的问题

Question

我有库minSdk的问题：建议：使用最多16个minSdk的兼容库，或者将该项目的minSdk版本增加到至少19我在minSdkVersion部分中更改了build.gradle，但是显示：

D8：程序类型已存在：android.support.v4.app.INotificationSideChannel $ Stub

FAILURE：构建因异常而失败。

• 出了什么问题：任务执行失败'：app：transformDexArchiveWithExternalLibsDexMergerForDebug'。

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.prueba_2"
        minSdkVersion 19
        targetSdkVersion 28
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

D8: Program type already present: android.support.v4.app.INotificationSideChannel$Stub

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.
> com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\6.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\7.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\8.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\9.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\10.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\11.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\12.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\13.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\14.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\15.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\16.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\17.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\18.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\19.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\20.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\21.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\22.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\23.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\24.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\25.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\26.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\27.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\28.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\29.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\30.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\31.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\32.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\33.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\34.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\35.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\36.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\37.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\38.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\39.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\40.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\41.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\42.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\43.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\44.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\45.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\46.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\47.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\48.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\49.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\50.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\51.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\52.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\53.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\54.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\55.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\56.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\57.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\58.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\59.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\60.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\61.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\62.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\63.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\64.jar, C:\Users\ANALYSIC-NABLA\Documents\Flutter\Development\prueba_2\build\app\intermediates\transforms\dexBuilder\debug\65.jar
  Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes.
  Program type already present: android.support.v4.app.INotificationSideChannel$Stub

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.2.1, on Microsoft Windows [Version 10.0.17134.706], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[√] Android Studio (version 3.3)
[√] VS Code (version 1.33.1)
[√] Connected device (1 available)

• No issues found!

Answer 1

此插件已从使用已弃用的Android支持库迁移到AndroidX。 如果您的项目已迁移以使用它，则应安装插件的4.XX版本。 如果您使用的是旧项目结构，请使用版本2.4.11

Answer 2

有同样的问题。 尝试使用此方法迁移到AndroidX，如flutter文档所示：

1.tried菜单重构>迁移到AndroidX

2.got“没有找到用法”

我仍然有错误，所以我在这个链接中尝试了解决方案（使用选定的答案）：

[ Flutter Projects和Android X迁移问题

而且效果很好