Project Framework - Android Games Practical Programming by Example - page 36

Table 2.3 Thread's Public Methods

DrawThread
The main thread in the project is named DrawThread , which extends Thread and overrides
its run() method to call the GameView's doDraw() method periodically (every 100ms in
the project).
Let's look at the snippet:
/*
* This class extends Thread and overrides its run() method,
* calls the GameView's doDraw() method every 100ms.
*/
public class DrawThread extends Thread{
GameView father ;
SurfaceHolder surfaceHolder ;
boolean flag ; //thread state, 0-idle, 1-running

boolean isViewOn ; //GameView display state, 0-hidden, 1-on

public DrawThread(GameView father,SurfaceHolder surfaceHolder){
this . father = father;
this . surfaceHolder = surfaceHolder;
flag = true ;

}

public void run(){
while ( flag ){
while ( isViewOn ){
Canvas canvas = null ;
try {

canvas = surfaceHolder .lockCanvas();
synchronized ( surfaceHolder ){
father .doDraw(canvas);

}

}
catch (Exception e){
e.printStackTrace();

}
finally {