com/example/my_tutorial_tapbutton_counter/Counter.java
 com.example.my_tutorial_tapbutton_counter.Counter
com/example/my_tutorial_tapbutton_counter/main_layout.java
 com.example.my_tutorial_tapbutton_counter.main_layout
com/example/my_tutorial_tapbutton_counter/BuildConfig.java
 com.example.my_tutorial_tapbutton_counter.BuildConfig
