Cordova Android构建错误“无法读取未定义的属性'length'" [英] Cordova Android build error "Cannot read property 'length' of undefined"

问题描述

我有一个正在更新的旧的cordova项目.作为此过程的一部分，我删除了android平台并重新阅读.

I have an older cordova project that I am updating. As a part of this process, I removed the android platform and readded it.

现在，当我尝试构建项目时，出现以下错误:

Now when I try to build the project I get the following error:

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

在删除平台之前，它确实起作用了，所以我猜测它是一个错误或配置文件已更改.

This did work before I removed the platform so I am guessing it is a bug or a config file that changed.

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

There is a similar issue here: https://pt.stackoverflow.com/questions/219442/cordova-build-android-error-cannot-read-property-length-of-undefined

推荐答案

问题是我的gradle版本是2.1，而Cordova需要3.2.更新Android Studio(版本为2.1)并确保环境变量是最新的，这是使其再次运行的主要技巧.

The problem was that my gradle version was 2.1 where Cordova wanted 3.2. Updating Android Studio (It was at 2.1) and making sure the environment variables are upto date was the main trick to get it to work again.

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