android Could not GET 'http://maven.aliyun.com/nexus/content/repositories/google/com/android/tools/build/gradle/4.0.2/gradle-4.0.2.pom'.

根据提供的引用内容，Gradle同步失败的错误信息是"Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.2.0/gradle-3.2.0.pom'. Received status code 400 from server: Bad Request" [1和"Could not GET 'https://jcenter.bintray.com/com/google/protobuf/protobuf-java/3.4.0/protobuf-java-3.4.0.jar'" [2。同时在给出的完整build.gradle代码中，指定了三个仓库: maven.aliyun.com, google()和jcenter() [3。

根据提供的问题，无法找到与"http://maven.aliyun.com/nexus/content/repositories/google/com/android/tools/build/gradle/4.0.2/gradle-4.0.2.pom"相关的引用内容。请提供更多的引用内容或详细说明问题，以便我能够更准确地回答你的问题。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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- *3* [【Android Studio】出现Could not get resource 'https://jcenter.bintray.com/xxxxx/xxx.jar的问题解决...](https://blog.csdn.net/qq_35941776/article/details/104105698)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 33.333333333333336%"]
[ .reference_list ]