Android Studio getNdkVersion报错解决方案问题：升级到Android Studio最新版本后

问题：

升级到Android Studio最新版本后，编译项目报如下错误：

ModelCache.safeGet(androidProjectResult.androidProject::getNdkVersion, "") must not be null

解决方案：

未升级之前，只需要在local.properties文件里如下设置即可：

ndk.dir=path\\Android\\android-sdk\\ndk\\21.1.6352462
sdk.dir=path\\Android\\android-sdk

升级之后需要做额外设置，在gradle文件中设置ndkVersion，如下：

android {
    defaultConfig {
        minSdkVersion 21
    }
    externalNativeBuild {
        ndkBuild {
            path 'Android.mk'
        }
    }
    ndkVersion '21.1.6352462'
}

Android Studio日志中有提示：

NDK was located by using ndk.dir property. This method is deprecated and will be removed in a future release. Please delete ndk.dir from local.properties and set android.ndkVersion to [21.1.6352462] in all native modules in the project. developer.android.com/r/studio-ui…