Introduction:

This assignment is to develop a basic graphics and animation appin Android through the use of SurfaceView, Bitmap, Thread, and Arraylist, and to create simple animations onscreen and use TouchEvent for interaction.

Subject Intended Learning Outcomes to be assessed in this assignment:

Table 1

*Refer to the Appendix A for Subject Intended Learning Outcomes and Rubrics*

A.           Open a new project with an Empty View Activity.

B.            Draw on a SurfaceView

1.           SurfaceView provides a drawing surface which you can control its format, draw objects, and display them the way you want.

Create a SurfaceView and draw animage on the SurfaceView.

Create Panel.java

a.           Create a Panel class extends SurfaceView implements

SurfaceHolder.Callback

b.           Add the following override methods. (press Control+oto select)

i.   protected void onDraw(Canvas) (Note: NOT draw(Canvas)) ii.  public void surfaceChanged(SurfaceHolder, int, int, int)

iii. public void surfaceCreated(SurfaceHolder)

iv. public void surfaceDestroyed(SurfaceHolder)

c.           Add a constructor Panel(Context context) and add a SurfaceHolder in the constructor which provides usa canvas we can draw on.

d.           Declare a Bitmap object as a class variable.

e.           Initialize the Bitmap object in the constructor (you may copy the launcher   icon under mipmap folder to drawable folder or use your own graphic file).

f.            In OnDraw Method, put the image (Bitmap object) on the canvas.

2.           Create aThread class to control the drawing.

Create GameThread.java

a.           Create GameThread class extends Thread.

b.           Declare a SurfaceHolder object and a Panel object for the thread to run and a Boolean variable to control the thread.

c.           Add a constructor to receive the SurfaceHolder and Panel objects.

d.           Create a set method for run.

e.           Add the override run() method. (Control + oto select)

3.           In Panel.java, use the GameThread to draw on Canvas.

a.           Declare a GameThread object as a class variable.

b.           Initialize the GameThread object in the constructor.

c.           Start the thread when the surface is created.

d.           Shutdown and wait for thread to finish.

4.           In GameThread.java

a.           Implement the run method.  Create a Canvas and lock it.  Then draw on the canvas.  Unlock and post it to the surfaceHolder.