Failed to resolve: failed to resolve*

Background: some time ago, I did a PDF reading function, but when I introduced the remote warehouse dependency package, Android studio always reported errors. Failed to resolve: * well, I don’t need to say much nonsense. I’ll post the process of my solution for the reference of workers.

Premise: delete gradle.properties Then file – & gt; setting – & gt; proxy (search) – & gt; noproxy.
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2. Add the address of Alibaba cloud Maven warehouse in Android studio. As shown in the following figure:

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