Some ideas for your synopsis

• Modern GUI design (and programming) for Android application.
• Android wearable (Android API 20W)
• Google TV
• How to make apps for iPhone / comparing iPhone development to Android development
• How to make apps for Windows Phone (or Windows 8) / comparing ... http://www.microsoft.com/windowsphone/da-dk/default.aspx
• Cross-platform apps
• Android development with Flash or Lua http://www.lua.org/
• HTML5 for mobile devices.
• Java for iOS, Windows, etc. http://www.codenameone.com/
• Comparing Android development in Android Studio to Android development in Eclipse (or another IDE).
• Android security
• Differences and similarities between Android Phone apps and Tablet apps
• Business models for Android apps: How to make money from your Android apps http://www.androidsx.com/how-to-make-money-with-android-business-models/
• Android game programming
• RESTful web services with Android: SOAP vs. JSON
• Web service API's for Android, like ksoap http://stackoverflow.com/questions/7425808/difference-between-soap-and-ksoap
• Android audio, video and camera
• Android Bluetooth (communication with nearby devices)
• Android NFC (Near Field Communication) (communication with very close devices)
• Android sensors: Accelerometer, compass, gyroscope, orientation, temperature
• Android services (background processes)
• Multi-threading in Android applications
• Internationalizing and localizing your Android application to support different languages and cultures.
• Testing Android applications
• Dagger, a dependency injector for Android and Java
• Designing user interfaces for Android applications
• The development enviroment "MIT App Inventor" http://appinventor.mit.edu/explore/
• and many other ideas