The original unity2018 did not install SDK, wit, I downloaded the latest version of the SDK unity2019 from the unity hub, 2018 imported 2019 on the OK!
Note unityhub version, it is possible to download the official version can not, it is estimated that the software bug, install the latest beta version from the download success
lack of unity android SDK, Android package lacks SDK, let select the folder to import
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Origin blog.csdn.net/weixin_43975128/article/details/104199630
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