The drum set is the instrument central to the rhythm section. It acts as the motor that drives the group. A drum set can contain a multitude of percussion instruments, but in jazz, it usually consists of only a few parts. The lowest drum, or bass drum, is played with a pedal. The hi-hat, also played with a pedal, is a duo of small cymbals that crash together.
A style resource defines the format and look for a UI. A style can be applied to an individual View (from within a layout file) or to an entire Activity or application (from within the manifest file). For more information about creating and applying styles, please read Styles and Themes.
In order to create views and reference them from the application, a common pattern is to: 1  Define a view/widget in the layout file and assign it a unique ID: <Button android:id=@+id/my_button android:layout_width=wrap_content android:layout_height=wrap_content android:text=@string/my_button_text/>.