Hi, A bit of misunderstanding on your part about the try-catch-finally :)
Finally is where you put code you want to execute no matter what happened before, exception or not. Catch is the code executed only when an exception occurs Try is what you want to execute but might trigger an exception. See java : http://www.janeg.ca/scjp/flow/try.html Yahel On 11 avr, 15:15, Bevor <[email protected]> wrote: > Hello, > I use a thread for drawing to the canvas. By coincidence I recognized > that in the program always jumps into the finally part. After > view.onDraw(c); is reached it steps back to synchronized > (surfaceHolder) and then it steps into the finally part. This happens > every time. This means to me that every time exceptions are thrown. > Can anybody explain why this is so? > > public class GameThread extends Thread { > > private SurfaceHolder surfaceHolder; > private boolean isRunning = false; > private GameView view; > private long tickFrequency; > private long lastTick = System.currentTimeMillis(); > private int framesPerSecond = 25; > > public GameThread(SurfaceHolder surfaceHolder, Context context, > Handler handler, GameView view) { > this.surfaceHolder = surfaceHolder; > this.view = view; > tickFrequency = 1000 / framesPerSecond; > } > //Speed should be 25 frames per second > //1 Frame per 40 ms > @Override > public void run() { > Canvas c; > while (isRunning) { > c = null; > //updatePhysics(); > if (System.currentTimeMillis() > lastTick + tickFrequency) { > long timeDiff = System.currentTimeMillis() - > (lastTick + > tickFrequency); > try { > c = surfaceHolder.lockCanvas(null); > synchronized (surfaceHolder) { > view.onDraw(c); > } > } finally { //do this in a finally so that if an > exception is > thrown during the above we don't leave the > if (c != null) { //surface in an > inconsistent state > surfaceHolder.unlockCanvasAndPost(c); > > } > } > lastTick = System.currentTimeMillis() - timeDiff; > } > } > } > > public void setRunning(boolean run) { > isRunning = run; > } > > } > > Regards -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en To unsubscribe, reply using "remove me" as the subject.
