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Warning : Project is building density based multiple APKs but using tools version 19, you should upgrade to build-tools 21 or above to ensure proper packaging of resources
好吧,以上是運行我的應用程序時出現在我的gradle控制檯中的2個錯誤。該應用程序不運行,只是停止。我如何將構建工具更改爲21?將構建工具更改爲21