I have installed Android Studio and further installed the SDKs and tools via Android Studio. Here they are:

And my $ANDROID_HOME paths to the following: /Users/USER/Library/Android/sdk both in the terminal as well as in Android Studio.

However, when running tns doctor I get the following:

  
(...)  Verifying CocoaPods. This may take some time, please be patient
  ◟ Verifying CocoaPods. This may take some time, please be patient  ◜
  Verifying CocoaPods. This may take some time, please be patient  ◠
  Verifying CocoaPods. This may take some time, please be patient  ◝
  Verifying CocoaPods. This may take some time, please be patient  ◞
  Verifying CocoaPods. This may take some time, please be patient  ◡
  Verifying CocoaPods. This may take some time, please be patient..
  
  
You need to have the Android SDK Build-tools installed on your system.
  You can install any version in the following range: '>=23 <=25'. Run $
  $ANDROID_HOME/tools/bin/sdkmanager from your command-line to install
  required Android Build Tools.

Running "$ANDROID_HOME/tools/bin/sdkmanager" simply echoes a "help" prompt.

What exactly is happening here and how can I fix this so I can run "npm run android" and android related operations?

Thank you for your help