Fermin, Anthony +1 Merci à tous, vous me avez donné la part de réponse
Ma solution finale.
1.Créez ou générer (free Ajax loading gif generator) animation et de l'ajouter au projet
2..Créer une interface ResponseCallback (voir Coderholic - Blackberry WebBitmapField) recevoir résultat d'exécution de fil:
public interface ResponseCallback {
public void callback(String data);
}
3.Créez une classe pour gérer votre travail de fil d'arrière-plan. Dans mon cas, il a été demande http:
public class HttpConnector
{
static public void HttpGetStream(final String fileToGet,
final ResponseCallback msgs) {
Thread t = new Thread(new Runnable() {
public void run() {
HttpConnection hc = null;
DataInputStream din = null;
try {
hc = (HttpConnection) Connector.open("http://" + fileToGet);
hc.setRequestMethod(HttpsConnection.GET);
din = hc.openDataInputStream();
ByteVector bv = new ByteVector();
int i = din.read();
while (-1 != i) {
bv.addElement((byte) i);
i = din.read();
}
final String response = new String(bv.toArray(), "UTF-8");
UiApplication.getUiApplication().invokeLater(
new Runnable() {
public void run() {
msgs.callback(response);
}
});
}
catch (final Exception e) {
UiApplication.getUiApplication().invokeLater(
new Runnable() {
public void run() {
msgs.callback("Exception (" + e.getClass() + "): "
+ e.getMessage());
}
});
}
finally {
try {
din.close();
din = null;
hc.close();
hc = null;
}
catch (Exception e) {
}
}
}
});
t.start();
}
}
4.Créez WaitScreen (un hybride de FullScreen et AnimatedGIFField avec interface ResponseCallback):
public class WaitScreen extends FullScreen implements ResponseCallback
{
StartScreen startScreen;
private GIFEncodedImage _image;
private int _currentFrame;
private int _width, _height, _xPos, _yPos;
private AnimatorThread _animatorThread;
public WaitScreen(StartScreen startScreen) {
super(new VerticalFieldManager(), Field.NON_FOCUSABLE);
setBackground(
BackgroundFactory.createSolidTransparentBackground(
Color.WHITE, 100));
this.startScreen = startScreen;
EncodedImage encImg =
GIFEncodedImage.getEncodedImageResource("ajax-loader.gif");
GIFEncodedImage img = (GIFEncodedImage) encImg;
// Store the image and it's dimensions.
_image = img;
_width = img.getWidth();
_height = img.getHeight();
_xPos = (Display.getWidth() - _width) >> 1;
_yPos = (Display.getHeight() - _height) >> 1;
// Start the animation thread.
_animatorThread = new AnimatorThread(this);
_animatorThread.start();
UiApplication.getUiApplication().pushScreen(this);
}
protected void paint(Graphics graphics) {
super.paint(graphics);
// Draw the animation frame.
graphics
.drawImage(_xPos, _yPos, _image
.getFrameWidth(_currentFrame), _image
.getFrameHeight(_currentFrame), _image,
_currentFrame, 0, 0);
}
protected void onUndisplay() {
_animatorThread.stop();
}
private class AnimatorThread extends Thread {
private WaitScreen _theField;
private boolean _keepGoing = true;
private int _totalFrames, _loopCount, _totalLoops;
public AnimatorThread(WaitScreen _theScreen) {
_theField = _theScreen;
_totalFrames = _image.getFrameCount();
_totalLoops = _image.getIterations();
}
public synchronized void stop() {
_keepGoing = false;
}
public void run() {
while (_keepGoing) {
// Invalidate the field so that it is redrawn.
UiApplication.getUiApplication().invokeAndWait(
new Runnable() {
public void run() {
_theField.invalidate();
}
});
try {
// Sleep for the current frame delay before
// the next frame is drawn.
sleep(_image.getFrameDelay(_currentFrame) * 10);
} catch (InterruptedException iex) {
} // Couldn't sleep.
// Increment the frame.
++_currentFrame;
if (_currentFrame == _totalFrames) {
// Reset back to frame 0
// if we have reached the end.
_currentFrame = 0;
++_loopCount;
// Check if the animation should continue.
if (_loopCount == _totalLoops) {
_keepGoing = false;
}
}
}
}
}
public void callback(String data) {
startScreen.updateScreen(data);
UiApplication.getUiApplication().popScreen(this);
}
}
5.In la fin, créez écran de démarrage pour appeler HttpConnector .HttpGetStream et montrer WaitScreen:
public class StartScreen extends MainScreen
{
public RichTextField text;
WaitScreen msgs;
public StartScreen() {
text = new RichTextField();
this.add(text);
}
protected void makeMenu(Menu menu, int instance) {
menu.add(runWait);
super.makeMenu(menu, instance);
}
MenuItem runWait = new MenuItem("wait", 1, 1) {
public void run() {
UiApplication.getUiApplication().invokeLater(
new Runnable() {
public void run() {
getFile();
}
});
}
};
public void getFile() {
msgs = new WaitScreen(this);
HttpConnector.HttpGetStream(
"stackoverflow.com/faq", msgs);
}
//you should implement this method to use callback data on the screen.
public void updateScreen(String data)
{
text.setText(data);
}
}
MISE à JOUR: une autre solution naviina.eu: A Web2.0/Ajax-style loading popup in a native BlackBerry application
Vous pouvez voir l'exemple en utilisant l'écran pop-up ici. http://supportforums.blackberry.com/t5/Java-Development/Sample-quot-Please-Wait-quot-screen-part-1/ta-p/493808 J'ai résolu mon problème en utilisant ceci. – BSKANIA