Replacing View With Surfaceview To Draw On Other Than The Ui Thread

The following program does not work unless the line while (!done) (and the closing bracket) are uncommented. Do you understand why? Why is it not possible to ask the thread to run

Solution 1:

There you go

publicclassMySurfaceViewextendsSurfaceViewimplementsSurfaceHolder.Callback {

    ...

    classMyThreadextendsThread {

        booleanupdate=false;

        @Overridepublicvoidrun() {
            SurfaceHoldersurfaceHolder= holder;

            while (!done) {

                if(update) {
                    Canvascanvas= surfaceHolder.lockCanvas();

                    canvas.drawARGB(255, 0, 0, 128);
                    canvas.drawCircle(x, y, 5.0f, paint);

                    surfaceHolder.unlockCanvasAndPost(canvas);
                    update = false;
                }
            }
        }
    }

    publicvoidrequestUpdate() {
        update = true;
    }
}

and whenever something is changed, just call requestUpdate();