title: Ionic : emulator: ERROR: This AVD's configuration is missing a kernel file!! emulator: ERROR: ANDROID_SDK_ROOT is undefined
body: <p>I created an app with ionic, build in android and then when I run "ionic emulate android" I receive the following error :</p>
  
  <p>"emulator: ERROR: This AVD's configuration is missing a kernel file!! emulator: ERROR: ANDROID_SDK_ROOT is undefined"</p>
  
  <p>I read on internet and most of them says that I need to install ARM EABI v7a System Image. I have android studio, I opened the sdk and install all package (included ARM EABI v7a System Image) for all the version of android (4.2.1, 4.2.2 etc). </p>
  
  <p>Firstly How can I view the version of android that I am using in ionic? </p>
  
  <p>Second, How can I fix this error?</p>