support包有红色下划线，支持库版本的兼容问题

在app build.gradle中添加：

android {
..................
configurations.all{
    resolutionStrategy.eachDependency{ DependencyResolveDetails details ->
        def requested = details.requested
        if (requested.group == 'com.android.support') {
            if (!requested.name.startsWith("multidex")) {
                details.useVersion '26.1.0'
            }
        }
    }
}
}