Multi touch image for android (drag/zoom/rotate) Example.
Google API Calendar Event Example.
For development you need to create or select project in the GDC
If you need get SHA1 to enable the API use on Windows:
keytool -list -v -keystore "C:\Users\user_name\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android
On unix:
keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore -list -v
Drag and drop and swipe CardView for RecycleView Example.
Carousel with ViewPager and scaling Example.