Android How to Program, 3/e

5 Doodlz App

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 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 app bar.

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

• Use Android 6.0’s new permissions model to request permission for saving an image to external storage.

• Add libraries to ...