问题：
CommandInvokationFailure: Gradle build failed.
F:/Program Files/Unity/2019.3.0b3/Editor/Data/PlaybackEngines/AndroidPlayer/Tools\OpenJDK\Windows\bin\java.exe -classpath "F:\Program Files\Unity\2019.3.0b3\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-5.1.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx4096m" "assembleRelease"
FAILURE: Build failed with an exception.
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What went wrong:
Execution failed for task ':unityLibrary:packageReleaseResources'.Could not resolve all files for configuration ':unityLibrary:_internal_aapt2_binary'.
Could not resolve com.android.tools.build:aapt2:3.4.0-5326820.
Required by:
project :unityLibrary
Could not resolve com.android.tools.build:aapt2:3.4.0-5326820.
> Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/aapt2/3.4.0-5326820/aapt2-3.4.0-5326820.pom'.
> Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/aapt2/3.4.0-5326820/aapt2-3.4.0-5326820.pom'.
> Connect to mirrors.opencas.ac.cn:80 [mirrors.opencas.ac.cn/124.16.75.211] failed: Connection timed out: connect
Could not resolve com.android.tools.build:aapt2:3.4.0-5326820.
> Could not get resource 'https://jcenter.bintray.com/com/android/tools/build/aapt2/3.4.0-5326820/aapt2-3.4.0-5326820.pom'.
> Could not GET 'https://jcenter.bintray.com/com/android/tools/build/aapt2/3.4.0-5326820/aapt2-3.4.0-5326820.pom'.
> Connect to mirrors.opencas.ac.cn:80 [mirrors.opencas.ac.cn/124.16.75.211] failed: Connection timed out: connect尝试过论坛里的方法，目前JDK的版本是1.8.0，SDK的版本是26.1.1，之前是25，但是因为报错需要26，所以升级上去了，但是还是没有解决
怀疑是环境变量设置的问题，但是小弟并非计算机专业，没有办法非常系统的debug，麻烦各位大佬帮我看看具体是哪里出现了问题
