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Because the project uses Android 26, but the SDK is not installed and other versions are used
Reference
https://blog.csdn.net/ThePromonkeyOf_ HeLuo/article/details/78518701
Go to the SDK manager to download the corresponding API, and then compile it again. In the new version of Android studio, after selecting the corresponding API, click OK or apply below to confirm the download
That is, download it in the SDK management of studio settings
According to the API level value to the corresponding download, such as 26 to check the corresponding download
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