Development issue/problem: When I use com.android.support:appcompat-v7:28.+ in the build.gradle(module) of my project, it works without error. But if I just use com.android.support:appcompat-v7:28, without
Development issue/problem: When I use com.android.support:appcompat-v7:28.+ in the build.gradle(module) of my project, it works without error. But if I just use com.android.support:appcompat-v7:28, without