在 UE5 上构建 Android 时出现错误。
LogPlayLevel: Daemon will be stopped at the end of the build stopping after processing
LogPlayLevel: Build-tool 31.0.0 is missing DX at D:\androidSDk\build-tools\31.0.0\dx.bat
LogPlayLevel: IOException: https://dl.google.com/android/repository/addons_list-3.xml
LogPlayLevel: java.net.ConnectException: Connection refused: connect
LogPlayLevel: IOException: https://dl.google.com/android/repository/addons_list-2.xml
LogPlayLevel: java.net.ConnectException: Connection refused: connect
LogPlayLevel: IOException: https://dl.google.com/android/repository/addons_list-1.xml
LogPlayLevel: java.net.ConnectException: Connection refused: connect
LogPlayLevel: Failed to download any source lists!
LogPlayLevel: IO exception while downloading manifest:
LogPlayLevel: java.net.ConnectException: Connection refused: connect
LogPlayLevel: at java.net.DualStackPlainSocketImpl.connect0(Native Method)
LogPlayLevel: at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
LogPlayLevel: at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
LogPlayLevel: at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
LogPlayLevel: at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
LogPlayLevel: at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
LogPlayLevel: at java.net.Socket.connect(Socket.java:589)
LogPlayLevel: at java.net.Socket.connect(Socket.java:538)
LogPlayLevel: at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
LogPlayLevel: at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
LogPlayLevel: at sun.net.www.http.HttpClient$1.run(HttpClient.java:515)
LogPlayLevel: at sun.net.www.http.HttpClient$1.run(HttpClient.java:513)
LogPlayLevel: at java.security.AccessController.doPrivileged(Native Method)
LogPlayLevel: at sun.net.www.http.HttpClient.privilegedOpenServer(HttpClient.java:512)
LogPlayLevel: at sun.net.www.http.HttpClient.openServer(HttpClient.java:553)
LogPlayLevel: at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)
LogPlayLevel: at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)
LogPlayLevel: at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
LogPlayLevel: at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1199)
LogPlayLevel: at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
LogPlayLevel: at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
LogPlayLevel: at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:162)
LogPlayLevel: at com.android.sdklib.repository.legacy.remote.internal.DownloadCache.openUrl(DownloadCache.java:247)
LogPlayLevel: at com.android.sdklib.repository.legacy.remote.internal.DownloadCache.downloadAndCache(DownloadCache.java:624)
LogPlayLevel: at com.android.sdklib.repository.legacy.remote.internal.DownloadCache.openCachedUrl(DownloadCache.java:455)
LogPlayLevel: at com.android.sdklib.repository.legacy.LegacyDownloader.downloadAndStream(LegacyDownloader.java:61)
LogPlayLevel: at com.android.repository.impl.downloader.LocalFileAwareDownloader.downloadAndStream(LocalFileAwareDownloader.java:51)
LogPlayLevel: at com.android.repository.impl.manager.RemoteRepoLoaderImpl.lambda$fetchPackages$0(RemoteRepoLoaderImpl.java:139)
LogPlayLevel: at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
LogPlayLevel: at java.util.concurrent.FutureTask.run(FutureTask.java:266)
LogPlayLevel: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
LogPlayLevel: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
LogPlayLevel: at java.lang.Thread.run(Thread.java:748)
LogPlayLevel: Still waiting for package manifests to be fetched remotely.
LogPlayLevel: FAILURE: Build failed with an exception.
LogPlayLevel: * What went wrong:
LogPlayLevel: Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
LogPlayLevel: > Failed to find Build Tools revision 31.0.0
LogPlayLevel: * Try:
LogPlayLevel: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
LogPlayLevel: * Get more help at https://help.gradle.org
LogPlayLevel: BUILD FAILED in 15s
我知道Failed to download any source lists错误是因为我无法连接到谷歌。所以，我找到了一个连接到谷歌的代理。
我正在尝试编辑Engine\Extras\Android\SetupAndroid.bat以确保它将使用代理，并且我成功了，并且我使用 curl 命令获取 XML 文件，它也成功了。
但是现在在虚幻引擎cmd上不能用了，还是Failed to download any source lists报错。
我在 UEProject 中找到了 Gradle 文件，我尝试对其进行编辑，但是当我为我的 Android 设备重建项目时，它会刷新。
所以我被卡住了，我想我应该找到一种在虚幻引擎上使用代理的方法？