问题现象

SdkError: DOWNLOAD_SDK_ERROR
     > Cause: Unable to find the java component with apiVersion 4.
     > Solution: 
        1.Open SDK Manager and download java.
        2.Alternatively, modify the compileSdkVersion settings in the project- and module-level build.gradle files. 

解决方案

修改build.gradle文件：

ohos {
    compileSdkVersion 4
    defaultConfig {
        compatibleSdkVersion 3
    }
}

改成：

ohos {
    compileSdkVersion 5
    defaultConfig {
        compatibleSdkVersion 3
    }
}