Lab 8: Doodlz App ( Due 08 Mar 2013 )

The purpose of this lab is to design an Android App that will turn the device's screen into a virtual canvas that the user can use to draw or paint by moving one or more fingers across the screen. The app has options to set the drawing color and line width. Other options include turning the user's finger touch to erase or clear the screen. The user can also save the drawing into the device's Gallery of images or shake the device to clear the entire drawing from the screen.

With this app you will be learning the following technologies on the Android platform:

• Detect when the user touches the screen, moves a finger across the screen, and removes a finger from the screen
• Process multiple screen touches so the user can draw with multiple fingers at once
• Use a SensorManager to detect accelerometer motion events to clear the screen when the user shakes the device
• Use an Atomic Boolean 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 as the user draws the lines and to draw those lines with a Canvas
• Use a Toast object to briefly display a message on the screen

Realize that the instructions in the book is for an older version of eclipse and android api. One of the challenges that you will have to face is to map the older features mentioned in the instructions to the newer features of both eclipse and the android platform.

After you finish, please demonstrate to Tong Zhao what you have achieved. You will then write a report that will have the following format

  Lab 8: Doodlz App

  Date:

  Students' Names:

  Techniques Learned in the Lab:

  Problems Encountered:

  Solutions to those Problems:

  Enhancements to the Lab:

The report will be a Microsoft Word document called Lab_8.doc. You will submit the document through the turnin system by 11 pm Friday, 08 Mar 2013. There needs to be just one copy of the report for each pair of students.

You will also post on Piazza the last three items in your report - Problems, Solutions, and Enchancements by the above deadline.

Penalties: There will be a 10% late penalty per day if the report is not turned in by the deadline. After three days we will not accept the lab report. We will give you 1 class day grace period for showing the execution of your program to Tong Zhao. After the grace period there will be a late penalty of 10% for the next class period that you show the execution of your lab to Tong Zhao. After that we will not accept your lab.