Cordova Android构建错误“无法读取未定义的属性'长度'”

Question

我有一个旧的科尔多瓦项目，我正在更新。作为这个过程的一部分，我删除了android平台并重新阅读了它。

现在，当我尝试构建项目时，出现以下错误：

C:\App>cordova build android --verbose
No scripts found for hook "before_build".
No scripts found for hook "before_prepare".
Checking config.xml and package.json for saved platforms that haven't been added to the project
Config.xml and package.json platforms are the same. No pkg.json modification.
Package.json and config.xml platforms are different. Updating config.xml with most current list of platforms.
PlatformApi successfully found for platform android
Checking config.xml for saved plugins that haven't been added to the project
Checking for any plugins added to the project that have not been installed in android platform
No differences found between plugins added to project and installed in android platform. Continuing...
Generating platform-specific config.xml from defaults for android at C:\App\platforms\android\res\xml\config.xml
Merging project's config.xml into platform-specific android config.xml
Found "merges/android" folder. Copying its contents into the android project.
Merging and updating files from [www, platforms\android\platform_www, merges\android] to platforms\android\assets\www
Wrote out android application name "App" to C:\App\platforms\android\res\values\strings.xml
android-versionCode not found in config.xml. Generating a code based on version in config.xml (1.0.20): 10020
Wrote out Android package name "com.nge.app" to C:\App\platforms\android\src\com\nge\bca\MainActivity.java
Updating icons at platforms\android\res
Updating splash screens at platforms\android\res
This app does not have additional resource files defined
Prepared android project successfully
No scripts found for hook "after_prepare".
No scripts found for hook "before_compile".
ANDROID_HOME=C:\Android\sdk
JAVA_HOME=C:\Program Files\Java\jdk1.8.0_40
Error: Cannot read property 'length' of undefined

这在我删除平台之前确实起到了作用，所以我猜是一个bug或一个配置文件发生了变化。

这里有一个类似的问题：https://pt.stackoverflow.com/questions/219442/cordova-build-android-error-cannot-read-property-length-of-undefined

Answer 1

您可以使用降级cordova cli

npm install -g cordova@6.4.0

并用give命令构建项目

ionic cordova build android

无需添加平台，它会自动添加。如果要求更新cordova cli，请选择否

Answer 2

我找到了另一个解决方案，将Android降级到6.1.2版本，因为这里的建议（以及各种论坛上的许多其他建议，如重新安装插件等）对我不起作用：

cordova platform update android@6.1.2 --save

如果这在第一手不起作用，请尝试以下操作：

>

首先移除Android平台：

cordova platform remove android

添加Android版本6.1.2：

cordova platform add android@6.1.2

构建Android：

cordova build android

以下是我在上述（Mac上）之前采取的一些额外步骤，以确保：

>

通过以下方式添加JAVA\u主页：

echo export "JAVA_HOME=\$(/usr/libexec/java_home)" >> ~/.bash_profile

重新启动shell（CMD Q并再次打开）

确保echo$JAVA\u HOME等于Android Studio-

对我来说，这是以下路径和版本：

/Library/Java/JavaVirtualMachine/jdk1.8.0\U 144。jdk/目录/主页

更新Android Studio和所有SDK包

更新npm

npm update -g

注意：在OS X 10.11 El Capitan或更高版本上，运行：

sudo npm update -g --unsafe-perm=true

更新科尔多瓦

npm update -g cordova

如果所有这些都不适用于您，您别无选择，我建议您尝试将Cordova降级到6.4.0版本：

npm update -g cordova@6.4.0