NDK is missing a "platforms" dir

Android Studio 执行:

./gradlew clean

报以下警告：

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解决方法
在要添加的NDK路径下面，新建立了一个空文件夹platforms便解决了这个问题:
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接下来报：

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> No toolchains found in the NDK toolchains folder for ABI with prefix: arm-linux-androideabi

解决方法
指定NDK位置：(有说Android studio4.1版本已不需要指定ndk位置，只需要指定ndk版本即可。但指定版本的话，会报Could not find method ndkVersion() for arguments [22.1.7171670] on object of type com.android.build.gradle.internal.dsl.BaseAppModuleExtension)

1、打开Project Structure->SDK Location:

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Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: Could not resolve com.tencent.bugly:crashreport:latest.release.