对于MAC

./gradlew build——刷新依赖项

对于Windows

Gradlew构建—刷新依赖项

也可以尝试gradlew assembleDevelopmentDebug—刷新依赖

有两种方法:

使用命令行选项刷新依赖项现金。 您可以删除本地缓存，其中artefast是由Gradle和触发构建缓存

使用——refresh-dependencies选项:

./gradlew build --refresh-dependencies

简单解释——refresh-dependencies选项告诉Gradle忽略已解析模块和工件的所有缓存条目。

长explanantion

WIth –refresh-dependencies’ Gradle will always hit the remote server to check for updated artifacts: however, Gradle will avoid downloading a file where the same file already exists in the cache. First Gradle will make a HEAD request and check if the server reports the file as unchanged since last time (if the ‘content-length’ and ‘last-modified’ are unchanged). In this case you’ll get the message: "Cached resource is up-to-date (lastModified: {})." Next Gradle will determine the remote checksum if possible (either from the HEAD request or by downloading a ‘.sha1’ file).. If this checksum matches another file already downloaded (from any repository), then Gradle will simply copy the file in the cache, rather than re-downloading. In this case you’ll get the message: "“Found locally available resource with matching checksum: [{}, {}]”.

使用删除: 当你删除缓存

rm -rf $HOME/.gradle/caches/

你只需要清理所有缓存的jar和sha1和，Gradle在你的机器上没有工件的情况下，必须下载所有东西。是的，第一次它将100%工作，但是当另一个快照被释放并且它是依赖树的一部分时，您将再次面临刷新或清除缓存的选择。

通常，您可以使用命令行选项refresh-dependencies刷新缓存中的依赖项。你也可以删除~/.gradle/caches下的缓存文件。在下一次构建时，Gradle会再次尝试下载它们。

您的具体用例是什么?您使用动态依赖版本还是快照版本?

在Unix系统上，你可以删除Gradle已经下载的所有现有工件(工件和元数据):

rm -rf $HOME/.gradle/caches/

注意——refresh-dependencies不会总是重新下载每个工件;它将使用与存储库中存在的内容匹配的现有副本。从Gradle用户指南，刷新依赖:

The --refresh-dependencies option tells Gradle to ignore all cached entries for resolved modules and artifacts. A fresh resolve will be performed against all configured repositories, with dynamic versions recalculated, modules refreshed, and artifacts downloaded. However, where possible Gradle will check if the previously downloaded artifacts are valid before downloading again. This is done by comparing published SHA1 values in the repository with the SHA1 values for existing downloaded artifacts. [...] It’s a common misconception to think that using --refresh-dependencies will force download of dependencies. This is not the case: Gradle will only perform what is strictly required to refresh the dynamic dependencies. This may involve downloading new listing or metadata files, or even artifacts, but if nothing changed, the impact is minimal.

Android Studio 3.4.1

简单地打开gradle选项卡(可以位于右侧)，右键单击列表中的父项(应该称为“Android”)，然后选择“刷新依赖项”。

这将解决您的问题。

您需要重新下载它，因此您可以手动下载并替换损坏的文件，并再次同步您的项目。去这个位置 C: \用户【用户名】.gradle \包装\ dist gk2rcmfc6p2dg9u9ohc3hw9 55 \ gradle3.3-all \ \ gradle all.zip——3.3 在此删除gradle3.3allzip，并重新从该站点下载 https://services.gradle.org/distributions/ 找到相同的文件，下载并粘贴到该位置 然后同步你的项目。 希望它也适用于你。

以上的解决方案对我都不起作用。

如果你使用IntelliJ，解决这个问题的方法就是简单地刷新所有Gradle项目: