Android NDK报错：Your APP_BUILD_SCRIPT points to an unknown file：./jni/Android.mk解决方法

最近在使用NDK编译JNA接口时报错：

> Task :app:ndkBuild FAILED
D:/MyDevEnv/Android-SDK/ndk/21.4.7075529/build//../build/core/add-application.mk:88: *** Android NDK: Aborting...    .  Stop.
make: Entering directory 'D:/MyWork/jasmine-android/app/src/main'
Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-16.    
Android NDK: WARNING: APP_PLATFORM android-16 is higher than android:minSdkVersion 1 in ./AndroidManifest.xml. NDK binaries will *not* be compatible with devices older than android-16. See https://android.googlesource.com/platform/ndk/+/master/docs/user/common_problems.md for more information.    
Android NDK: Your APP_BUILD_SCRIPT points to an unknown file: ./jni/Android.mk    
make: Leaving directory 'D:/MyWork/jasmine-android/app/src/main'

Execution failed for task ':app:ndkBuild'.
> Process 'command 'D:\MyDevEnv\Android-SDK\ndk\21.4.7075529/ndk-build.cmd'' finished with non-zero exit value 2

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