• https://developer.android.com/sdk/index.html
• Android SDK Manager
  • Install Android SDK Build-tools 21.1.2 or later
  • Install Android 5.0.1 (API 21)
    • SDK Platform 21
    • Extras
    • Android Support Repository

• Open Android Studio
• File -> Import Project
• Run -> Run 'app'

This Android project is a clone from http://git.eclipse.org/c/paho/org.eclipse.paho.mqtt.java.git/ and just contains the changes to build it with gradle