support v4v7兼容包问题“Error:(26, 13) Failed to resolve: com.android.support:appcompat-v7:27.+”

应该是缺乏V7依赖包对应版本的ANDROID SDK BUILDTOOLS,在PROJECT STRUCTURE里点击右上加号,输入v7显示存在的v7包版本,移除原来的V7包依赖

support v4v7兼容包问题“Error:(26, 13) Failed to resolve: com.android.support:appcompat-v7:27.+” 修改对应的SDK编译版本和BUILDTOOLS版本即可

support v4v7兼容包问题“Error:(26, 13) Failed to resolve: com.android.support:appcompat-v7:27.+”