How to properly stop a "drawing" thread

A thread:

    public class DrawThread extends Thread {
    private RMapCanvas canvas;
    final Handler myHandler = new Handler();
    final ArrayList<RGroupMapLayer> layers;

    public DrawThread(RM开发者_如何学编程apCanvas aCanvas, ArrayList<RGroupMapLayer> arrayOfLayers)
    {
        canvas = aCanvas;
        layers = arrayOfLayers;
    }

    public void run() {
        activity.RaiseNotification(activity.getApplicationContext().getResources().getString(R.string.loading).toString());
        for (RGroupMapLayer l : layers)
             {
                 l.validateAndRepairView(false, canvas.renderer, canvas.mapView);
                 l.render(canvas.renderer, canvas.mapView, canvas.mapEvent, 5000000, 5000000);
                 if (settings.getPositionFeature() != null)
                 {
                     RPointFeatureStyle positionStyle = new RPointFeatureStyle(RPointFeatureStyle.SIMPLE_POINT_STYLE_GPS);
                     positionStyle.render(settings.getPositionFeature(), renderer, mapView);
                 }
                 myHandler.post(new Runnable() {
                     @Override
                     public void run() {
                         canvas.RenderComplete(); 
                     }});
             }
     activity.statusMessage.cancel();
    }

    public synchronized void requestStop() {
        activity.statusMessage.cancel();
        this.interrupt();
    }
}

Calling the requestStop that interrupts a thread is not enough. The thread just keeps running. Can some one please update the code to show me the correct way of stopping this thread? And by the way ... the RenderComplete() methods updates the UI (witch is a problem in my case, because "old" threads keep updating the UI even if new one is starter and the old one interrupted).

Thanx in advance.

In general interrupting or stoping threads by yourself is not recommended. Your thread should have a flag inside the run method. When the flag is true - the thread is running, when the flag is false - thread is also running, but now it doesn't do anything. The system will stop this thread when needed. Here's how it should look:

    public void run() {
        while (flag) {
        //do your work
        }
    }

And to "stop" the thread just use flag = false;

Hope this helps.