评估根项目“firebase_auth”时出现问题。 > 找不到 firebase_core FlutterFire 插件

Question

一切都很顺利。我尝试将 google_mobile_ads 包添加到 pubspec.yaml，添加此包后，每当我运行应用程序时，它都会说 minSdk 版本不应低于 19。

What went wrong:
Execution failed for task ':app:processDebugManifest'.
Manifest merger failed : uses-sdk:minSdkVersion 16 cannot be smaller than version 19 declared in library [:google_mobile_ads] D:\Academic\My Work\Software Projects\My Mates\my_mates\build\google_mobile_ads\intermediates\library_manifest\debug\AndroidManifest.xml as the library might be using APIs not available in 16
Suggestion: use a compatible library with a minSdk of at most 16,
  or increase this project's minSdk version to at least 19,
  or use tools:overrideLibrary="io.flutter.plugins.googlemobileads" to force usage (may lead to runtime failures)

所以我将 android/app/build.gradle 中的 minSdkVersion 从 16 更新到 19。现在每当我运行代码时都会显示

A problem occurred evaluating root project 'firebase_auth'.
Could not find the firebase_core FlutterFire plugin, have you added it as a dependency in your pubspec?

虽然我已将 firebase_auth(^3.0.1) 和 firebase_core(^1.4.0) 更新到最新版本，但没有任何效果。

看到许多相关问题却没有解决方案，这很奇怪。遇到同样问题的人请分享如何克服它并成功重建应用程序。

Answer 1

在终端中运行flutter clean。

之后，再次运行flutter packages get 以在您的应用程序中下载最新的包。