在release构建类型中，根本不要指定signingConfig，并且不会对您的构建进行签名.发行版本不会采用调试版本获得的默认签名配置，因此它应适用于这些版本.

In the release build type, don't specify a signingConfig at all, and your build won't be signed. Release builds don't pick up the default signing config that debug builds get, so it should work for those.

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请记住，要从Android Studio进行构建，您需要转到Gradle任务窗口并选择assembleRelease任务；通过"Make Project"进行的常规构建实际上并没有构建最终的APK.

Bear in mind that to build from Android Studio, you'll need to go to the Gradle tasks window and choose the assembleRelease task; normal builds via "Make Project" don't actually build the final APK.