当我指定28.0.2时(compileSDKVersion=28):
【WARNING: The specified Android SDK Build Tools version (28.0.2) is ignored, as it is below the minimum supported version (28.0.3) for Android Gradle Plugin 3.4.1.
Android SDK Build Tools 28.0.3 will be used.
To suppress this warning, remove "buildToolsVersion '28.0.2'" from your build.gradle file, as each version of the Android Gradle Plugin now has a default version of the build tools.】
新版本不需要buildToolVersion属性了,会使用与compileSDKVersion对应的稳定版本.