android studio编程时出现的错误：Cannot get property 'XXXX' on extra properties extension as it does not exist

标签： android studioandroidbuild.gradlerootProject

2016-11-26 11:46 3078人阅读评论(0) 收藏举报

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android开发中出现的错误异常（5）

用Android Studio中导入第三方库工程的时候出现的问题：
Error:(28, 0) Cannot get property 'junitVersion' on extra properties extension as it does not exist

出现这种问题原因是第三方库工程 引用了 自定义的 junitVersion 这个名字的ext；因此在该项目的根目录那个build.gradle里的ext加上junitVersion这个即可，如下

引用这些自定义ext的值方法如下：

$rootProject.ext.{value}

该方法的好处就是：

[java] view plaincopy

defaultConfig {
compileSdkVersion rootProject.ext.compileSdkVersion
buildToolsVersion rootProject.ext.buildToolsVersion
minSdkVersion rootProject.ext.minSdkVersion
targetSdkVersion rootProject.ext.targetSdkVersion
}
<pre class="prettyprint" name="code"><code class="hljs cs has-numbering">dependencies {
// App's dependencies, including test
compile "com.android.support:appcompat-v7:$rootProject.supportLibraryVersion"
compile "com.android.support.test.espresso:espresso-idling-resource:$rootProject.espressoVersion"
compile "com.google.guava:guava:$rootProject.guavaVersion"
// Dependencies for local unit tests
testCompile "junit:junit:$rootProject.ext.junitVersion"
testCompile "org.mockito:mockito-all:$rootProject.ext.mockitoVersion"
testCompile "org.hamcrest:hamcrest-all:$rootProject.ext.hamcrestVersion"
}</code><div class="save_code tracking-ad" data-mod="popu_249"><a href="javascript:;"><img src="http://static.blog.csdn.net/images/save_snippets.png"></a></div></pre>

而project的Gradle（

项目的根目录那个build.gradle

）中是这么写的：

[java] view plaincopy

// Define versions in a single place
ext {
// Sdk and tools
minSdkVersion = 10
targetSdkVersion = 24
compileSdkVersion = 24
buildToolsVersion = '24.0.2'
// App dependencies
supportLibraryVersion = '24.2.0'
guavaVersion = '18.0'
junitVersion = '4.12'
mockitoVersion = '1.10.19'
powerMockito = '1.6.2'
hamcrestVersion = '1.3'
runnerVersion = '0.5'
rulesVersion = '0.5'
espressoVersion = '2.2.2'
}

用rootProject中的一个值来代替本来的版本号，目前理解成多个module时的用处，即抽取出来统一管理：例：

[java] view plaincopy

ext {
junitVersion = '4.12'
}

4.12这个是自定义的，其他名称的同理。************************************************ rootProject 方法介绍 *************************************************************

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android studio编程时出现的错误：Cannot get property 'XXXX' on extra properties extension as it does not exis

android studio编程时出现的错误：Cannot get property 'XXXX' on extra properties extension as it does not exist

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