Java Development

[heather_1]

Hi,

I am trying to rotate the bitmapfield in my status bar on 3 second intervals. I know threading is involved in some manner but can't figure it out. Here is what I have so far. Any help would be appreciated!

new Thread(){
        	  public void run(){
        		  try {
        	            timer = new Timer();
        	            timer.scheduleAtFixedRate(new ImageTask(), 0, 5000);
        	        } catch (Exception e) {
        	            // do nothing
        	        }
        	  }
        	}.start();

    private class ImageTask extends TimerTask {
        public void run() {
            System.out.println("Test Printing..");
            setStatus(adField2);
        }
    }

[heather_1]

I get an IllegalStateException with an assertHaveEventLock...

[heather_1]

I am trying this now...still not changing image, but no error

        new Thread(){
        	  public void run(){
        		System.out.println("run entered");
        		  try {
        			  	System.out.println("in try");
        	            timer = new Timer();
        	            sleep(3000);
        	            setStatus(adField1);
        	            sleep(3000);
        	            setStatus(adField2);
        	            sleep(3000);
        	            setStatus(adField);
        	            //timer.scheduleAtFixedRate(new ImageTask(), 0, 3000);
        	        } catch (Exception e) {
        	            e.getMessage();
        	        }
        	  }
        	}.start();

[juanmab]

I guess the problem is that you can't modify the UI being outside de main thread or without having the event lock.

Look for an example of threads using invokeLater().

That will do it.

UiApplication.getUiApplication().invokeLater(new Runnable() {
				public void run() {			        	        
					//some code lalalala
				}
			});

[heather_1]

ok not error now, but can anyone tell me why this code is now rotating the images?

       	UiApplication.getUiApplication().invokeLater(new Runnable() {
				public void run() {			        	        
					System.out.println("in try");
    	            timer = new Timer();
    	            
						try {
							synchronized (this){

							wait(3000);
							setStatus(adField1);
							notify();
							}
						} catch (InterruptedException e1) {
							// TODO Auto-generated catch block
							e1.printStackTrace();
						}
					
    	            
    	            try {
    	            	synchronized (this){

							wait(3000);
							setStatus(adField2);
							notify();
							}
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
    	         
    	            try {
    	            	synchronized (this){

							wait(3000);
							setStatus(adField);
							notify();
							}
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
    	            
    	            //timer.scheduleAtFixedRate(new ImageTask(), 0, 3000);
				}
			});

[dnepr]

You are blocking the event thread among other things.

Use invokeLater inside the timer task. You also don't need to create the timer in a separate thread.

[juanmab]

As I'm new so I don't now why you are using synchronized o the notify.

Did you try without that?

			UiApplication.getUiApplication().invokeLater(new Runnable() {
				public void run() {			        	        				
					try {
						sleep(3000);
						setStatus(adField1);
						sleep(3000);
						setStatus(adField2);
						sleep(3000);
						setStatus(adField);	
					} catch (InterruptedException e1) {
						e1.printStackTrace();
					}   	            
				}
			});

Remember to give kudos when appropriate

[heather_1]

@depnr : can you give me an example?

[dnepr]

Sure, it's very simple.


If drawing by hand:
1. Create a timer and timer task
2. Inside the timertask iterate over angles (i.e 0, 90, 180, 270) and call invalidate to force a repaint.
3. Draw / rotate the image via drawBitmap or drawTexturedPath depending on if angle is 0 or rotation is needed.

If just updating the bitmapfield:
1. same as above
2. precache n images for the desired angles
3. use invokeLater inside the timertask to set the new bitmap based on angle
4. Might need to call invalidate after setting the bitmap on some OSes in case there is a "feature" which doesn't repaint it properly after setting.

[heather_1 · Accepted solution]

I got it figured out...I am using this code:

            final Timer t=new Timer();
            TimerTask tt=new TimerTask() {
                public void run() {
                    if(ad_time % 3 == 0)
                        adField.setBitmap(CreativeCore.ad2);
                    if(ad_time % 3 == 1)
                        adField.setBitmap(CreativeCore.ad3);
                    if(ad_time % 3 == 2)
                        adField.setBitmap(CreativeCore.ad);
                   
                    ad_time++;
                    invalidate();
                }
            };

            t.scheduleAtFixedRate(tt, 1000, 3000);