[sanjayt]

Can any one please tell me, how to code for progress bar in blackberry, which will update contunuously depends on the input?

[John Clark]

*** moved to Developer Forum ***

[halon]

Well, I haven't done it myself, but I'm guessing what you could do is make a custom control which extends "Field", override layout(int width, int height) using setExtent() to provide boundaries, also override paint(net.rim.device.api.ui.Graphics g) in which to draw rectangles and fill them according to the 'percentage' variable in the class.

Then what you can do is give it some sort of function like UpdateProgress(int percentage) and have it update the variable inside the class, then manually call the paint() function - not sure where you would call that.

Is that any of any use to you? I'll give you more details if you want, but perhaps there's someone else on the forums who've done it before.

[jfisher]

i made this, needs two image files, one for the background and another for the progress bar itself. you pass the class a string which gets displayed as a message:

import java.util.Timer;
import java.util.TimerTask;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.Characters;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.component.BitmapField;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.container.PopupScreen;
import net.rim.device.api.ui.container.VerticalFieldManag er;
/*
* popupWaitingScreen.java
*
* Created on June 19, 2006, 5:01 PM
*
* @author jfisher
*/
public class popupWaitingScreen extends PopupScreen {
BitmapField myBitmapField = new BitmapField();
Bitmap backdrop = Bitmap.getBitmapResource("waitingbackground.png");
Bitmap progress = Bitmap.getBitmapResource("greysquare.png");
Timer timer = new Timer();
TimerTask updateTask;
int xval = 14;
Bitmap myBitmap = new Bitmap(165, 95);
BitmapField waitingField = new BitmapField(myBitmap);
Graphics myGraphics = new Graphics(myBitmap);
/** Creates a new instance of popupWaitingScreen */
public popupWaitingScreen(String value) {
super(new VerticalFieldManager(),Field.FOCUSABLE);


if(value.length()>26){
value = value.substring(0,23) + "...";
}

final String message = value;
updateTask = new TimerTask() {
public void run() {
myGraphics.drawBitmap(0,0,165,95,backdrop, 0,0);
myGraphics.drawBitmap(xval,79,7,7,progress, 0,0);
myGraphics.drawText(message, 10,10);
xval = xval+3;
if(xval>140){
xval = 14;
}
waitingField.setBitmap(myBitmap);
}
};
add(waitingField);
timer.scheduleAtFixedRate(updateTask, 40, 80);
}

public boolean keyChar(char key, int status, int time) {
boolean retval = false;
switch (key) {
case Characters.ESCAPE:
int response = Dialog.ask(Dialog.D_YES_NO, "Are you sure you want to cancel this process and exit the application?");
if (Dialog.YES == response){
System.exit(1);
}else{
return true;
}
retval = true;
break;
default:
retval = super.keyChar(key, status, time);
}
return retval;
}
}

[fbrimm]

jfisher

Nice code! I hope you don't mind if I put it to use.

How do you remove the popup screen when what your waiting on completes?

Thanks.

fbrimm

[jfisher]

feel free - i'll add the code to my blog next week with some more detailed instructions, i've been using it for a few months now with no problems.

i use invokelater from my background thread to get rid of the popup, pushing the new screen - this is a little naughty as it leaves the timer process running:

UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
UiApplication.getUiApplication().popScreen(UiAppli cation.getUiApplication().getActiveScreen());
UiApplication.getUiApplication().pushScreen(new myScreen());
}
});

- but it's performed fine for what i need, you could add some code using Screen.onExposed and/or Screen.onObscured() inside the progress class to check when the new screen has been pushed from the background thread so it can cancel the timer operations, alternatively you could have a boolean in a logic class it routinely checks to see if it still needs to be active - this isn't the most elegant/proper way of doing it - but it works.

in action:

[markat2k]

This is pretty simple. Might be better to use TimerTask somehow than extend Thread.

/**
 * Defines ProgressBar object. Creates popup screen with title, and perpetually updating
 * progress gauge. Instantiate and run as thread to start progress update. Call
 * remove() method when finished to remove popup screen and shutdown thread.
 */
package mrm.util;

import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.GaugeField;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.container.DialogFieldManager;
import net.rim.device.api.ui.container.PopupScreen;

public class ProgressBar extends Thread {

	private int maximum, timeout;

	private boolean useful;

	private PopupScreen popup;

	private GaugeField gaugeField;

	/**
	 * Object constructor
	 * 
	 * @param title
	 *           Text to display on popup area
	 * @param maximum
	 *           Range / width of the gauge field of progress bar
	 * @param timeout
	 *           Milliseconds to pause between updates to progress bar
	 * @see GaugeField
	 * @see Thread
	 * @see PopupScreen
	 */

	public ProgressBar(String title, int maximum, int timeout) {
		this.maximum = maximum;
		this.timeout = timeout;

		DialogFieldManager manager = new DialogFieldManager();

		popup = new PopupScreen(manager);
		gaugeField = new GaugeField(null, 1, maximum, 1, GaugeField.NO_TEXT);

		manager.addCustomField(new LabelField(title));
		manager.addCustomField(gaugeField);
	}

	/**
	 * run() method for starting thread
	 */

	public void run() {
		useful = true;

		UiApplication.getUiApplication().invokeLater(new Runnable() {
			public void run() {
				UiApplication.getUiApplication().pushScreen(popup);
			}
		});

		int iterations = 0;

		while (useful) {
			try {
				Thread.sleep(timeout);
			} catch (Exception e) {
			}

			if (++iterations > maximum)
				iterations = 1;

			gaugeField.setValue(iterations);
		}

		if (popup.isDisplayed()) {
			UiApplication.getUiApplication().invokeLater(new Runnable() {
				public void run() {
					UiApplication.getUiApplication().popScreen(popup);
				}
			});
		}
	}

	/**
	 * Method to shutdown the thread and remove the popup screen
	 *  
	 */

	public synchronized void remove() {
		useful = false;
	}
}

[whickie]

Anyone having problems with PopupScreen on the Pearl?

I get ControlledAccessException if I try to push a PopupScreen.