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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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 *************************************************************
引用这些自定义ext的值方法如下：$rootProject.ext.{value}
该方法的好处就是：
用rootProject中的一个值来代替本来的版本号，目前理解成多个module时的用处，即抽取出来统一管理：例：
defaultConfig { compileSdkVersion rootProject.ext.compileSdkVersion buildToolsVersion rootProject.ext.buildToolsVersion minSdkVersion rootProject.ext.minSdkVersion targetSdkVersion rootProject.ext.targetSdkVersion}dependencies { // App's dependencies, including test compile "com.android.support:appcompat-v7:$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"}
而project的Gradle（项目的根目录那个build.gradle
）中是这么写的：
// Define versions in a single placeext { // 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'}
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