demo现在已切换到AndroidStudio环境，第一次build如果出现
Error:A problem occurred configuring project ':app'.
> SDK location not found. Define location with sdk.dir in the local.properties file or with an ANDROID_HOME environment variable.
这是由于Android SDK路径没有配置好，推荐：
ANDROID_HOMElocal.properties文件，并指定sdk.dir={本机Android SDK所在绝对路径}
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