Objectives

In this chapter you’ll:

Detect when the user touches the screen, moves a finger across the screen and removes a finger from the screen.

Process multiple touches so the user can draw with multiple fingers at once.

Use a SensorManager and the accelerometer to detect motion events.

Use an AtomicBoolean object to allow multiple threads to access a boolean value in a thread-safe manner.

Use a Paint object to specify the color and width of a line.

Use Path objects to store each line’s data and use a Canvas to draw each line into a BitMap.

Create a menu and display menu items on the action bar.

Use Android 4.4’s immersive mode to enable the user to draw on the entire screen.

Use Android 4.4’s printing framework and the Android Support Library class PrintHelper to enable the user to print a drawing.