评估项目 ':app' 时出现问题。 > 路径不能为 null 或空字符串。路径='空'

Question

我在尝试运行 Flutter 时遇到错误。

 D:\fluttapp\testbuild>flutter run
Launching lib/main.dart on Google Pixel 2 XL in debug mode...
Initializing gradle...                                       2.1s
Resolving dependencies...
* Error running Gradle:
ProcessException: Process "D:\fluttapp\testbuild\android\gradlew.bat" exited abnormally:

FAILURE: Build failed with an exception.

* Where:
Build file 'D:\fluttapp\testbuild\android\app\build.gradle' line: 57

* What went wrong:
A problem occurred evaluating project ':app'.
> path may not be null or empty string. path='null'

* 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

BUILD FAILED in 6s
  Command: D:\fluttapp\testbuild\android\gradlew.bat app:properties


Please review your Gradle project setup in the android/ folder.

D:\fluttapp\testbuild>flutter doctor -v
[√] Flutter (Channel beta, v1.1.8, on Microsoft Windows [Version 10.0.17134.556], locale
    en-IN)
    • Flutter version 1.1.8 at D:\flutter
    • Framework revision 985ccb6d14 (3 weeks ago), 2019-01-08 13:45:55 -0800
    • Engine revision 7112b72cc2
    • Dart version 2.1.1 (build 2.1.1-dev.0.1 ec86471ccc)

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    • Android SDK at D:\Users\Bhanu\AppData\Local
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.3
    • ANDROID_HOME = D:\Users\Bhanu\AppData\Local
    • Java binary at: D:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)
    • All Android licenses accepted.

[√] Android Studio (version 3.1)
    • Android Studio at D:\Program Files\Android\Android Studio
    • Flutter plugin version 29.0.1
    • Dart plugin version 173.4700
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

[√] Connected device (1 available)
    • Google Pixel 2 XL • 192.168.50.101:5555 • android-x86 • Android 9 (API 28)

• No issues found!

我在这里添加了回购。我已经使用示例代码来制作发布应用程序版本，但无法生成它们。创建密钥库并添加到代码仓库

https://github.com/bhanu888/buildapk

Answer 1

对我来说，这是一个路径问题。

我一直在关注颤振指南https://flutter.io/docs/deployment/android

Create a file named <app dir>/android/key.properties that contains a reference to your keystore:

出于某种原因，我（错误地）将我的“key.properties”放在了 app_dir/android/app 文件夹中，这给了我错误。

* What went wrong:
A problem occurred evaluating project ':app'.
> path may not be null or empty string. path='null'

所以请检查您的路径，以及您的文件所在的位置 :)

奖励信息： 帮助 med 的是检查具有不同设置的“gradle.build”文件，它总是给我带来问题的 storeFile 文件（keystoreProperties ['storeFile']）。 尝试将其注释掉，或将其更改为：

storeFile file("key.jks")  

如果这可行，您就知道“key.jks”文件的路径正确。然后尝试引入poperties文件（keystoreProperties） 喜欢

storeFile file(keystoreProperties['storeFile']) 

起初这不起作用，但现在可以了:)

所以再次检查您的“key.jks”和“key.properties”文件是否位于“正确”的位置，以及您指向它们的方式。

Answer 2

如果您从 github 下载了该应用程序，则签名配置可能已适应注释。尝试像这样在 android/app/build.gradle 上评论代码：

    /*signingConfigs {
    release {
  keyAlias keystoreProperties['keyAlias']
        keyPassword keystoreProperties['keyPassword']
        storeFile file(keystoreProperties['storeFile'])
        storePassword keystoreProperties['storePassword']
    }
}
buildTypes {
    release {
        // TODO: Add your own signing config for the release build.
        // Signing with the debug keys for now, so `flutter run --release` works.
        signingConfig signingConfigs.release
    }
   */`

解决方案在： https://github.com/transistorsoft/flutter_background_geolocation/issues/18

Answer 3

我用过

storeFile file(keystoreProperties['storeFile'])

在编译时抛出了一个错误。但是将上面的行替换为

storeFile file("key.jks")

构建成功。我不知道这是怎么回事..？

Answer 4

如果您只是测试或调试而不是发布，您可以考虑将构建类型更改为调试而不是发布。

In <APP_FOLDER>/android/app/build.gradle

buildTypes {
        release {
            signingConfig signingConfigs.debug
       }
    }

Answer 5

1)查看本项目中的Key“key.jks”

转到“gradle.build”

替换它

storeFile file("key.jks")  

与

storeFile file(keystoreProperties['storeFile']) 

Answer 6

必须有2个后缀的文件

1. “调试”
2. “发布” 通过文件资源管理器将这两个文件添加到您的项目中 然后在你的文件中编辑名为 local.properties 的路径
3. debugStoreFile=C:/Users/Sachin/Android_Studio_project...
4. storeFile=C:/Users/Sachin/Android_Studio_project...