i have created a custom image button; one is play image button and one is pause image button.
i want to switch between play and pause (i.e when the user clicks on the button,it has to change - play to pause or pause to play).
for my requirement, i have referred to this example url
when i execute my program, i am able to display the button, but when i click on the button, i am not able to change the imagebutton (play to pause)
can any one help me?
The example that you are working off of uses two images, the on and the off image. However, it uses these two images to change the look of the button based on whether the button has focus or not.
You want something a little different. You want to change the look of the button whenever the button gets clicked. To do that, you can use this existing method:
protected boolean navigationClick(int status, int time){
fieldChangeNotify(1);
return true;
}
To do this, change (or add) some member variables to store the play and pause bitmaps, and then change navigationClick() to toggle between them:
private Bitmap _currentPicture;
private Bitmap _playPicture;
private Bitmap _pausePicture;
protected boolean navigationClick(int status, int time){
if (_currentPicture == _playPicture) {
_currentPicture = _pausePicture;
} else {
_currentPicture = _playPicture;
}
invalidate(); // may be necessary to force redraw of the button
fieldChangeNotify(1);
return true;
}
Edit: you also might want to perform the same logic (as above in navigationClick()) in the trackwheelClick() and keyChar() methods, depending on whether your buttons should be clickable by using the trackwheel or enter keys, too. See an example of that here
Related
I'm working with the Blackberry Touch Event and I need to process the TouchEvent.MOVE, TouchEvent.UP and TouchEvent.DOWN to move a carousel of images and the TouchEvent.CLICK to generate some specific action.
My problem is that the touchEvent() method is being called several times. How can I prevent this? Because the behaviour is getting all messed up.
For example: when I just want to capture the TouchEvent.CLICK event, the UP-DOWN-MOVE-CLICK are being triggered one after the next.
My code does the following:
protected boolean touchEvent(TouchEvent message) {
if (message.getEvent() == TouchEvent.CLICK) {
//CHANGE THE CONTENT OF A FIELD
return true;
} else if ((message.getEvent() == TouchEvent.MOVE)
|| (message.getEvent() == TouchEvent.UP)
|| (message.getEvent() == TouchEvent.DOWN)) {
//DELETE THE FIELD
//MOVE A CAROUSEL OF IMAGES
} else {
return false;
}
}
public void moverTouch(int dx) {
//ADD THE FIELD PREVIOUSLY DELETED
}
As you can see, when the CLICK event is captured, I need to change the content of a field, but when the MOVE or UP or DOWN event is captured, I need to delete that Field from his manager, do some working with a carousel of images, and then re-add the field previously deleted.
The carousel moving part works fine, but when I try to capture JUST the CLICK event, and the others are being triggered as well, but the moverTouch() function doesn't get triggered because there is no actual movement on the carousel of images, I end up with a deleted field that I need to update its content.
At a glance:
I think you need to differentiate touch gestures (I believe you are "listening" for something like a swipe gesture to scroll the gallery image) from "normal" touch events (specifically you need to process TouchEvent.CLICK to apply "some specific action" to the clicked image).
To decide whether the TouchEvent represents a gesture there is a TouchEvent.GESTURE constant. Then it is possible to know what exactly TouchGesture it represents by calling TouchEvent.getGesture().
Some sample code for touch gestures can be viewed here.
I am dealing with KeywordFilterField which is populated with the list of the countries. Now the problem i am facing is that when i click the particular country it should move to the next screen as I have written the pushScreen code in the trackwheelClick event after checking that _keywordFilterField is focusable or not, but this is not the case. The Menu opens when trackwheelClick event is fired, at the center of the screen, rather than moving onto the next screen.Can anybody have the idea why Menu dialog opens on the trackwheelclick event instead of going to the next screen.
See what i have done on trackwheel click event:
protected boolean trackwheelClick(int status, int time) {
if (_keywordFilterField.isFocus()) {
int index = _keywordFilterField.getSelectedIndex();
ReadableList readableList = _keywordFilterField.getResultList();
Object selectedCountry = readableList.getAt(index);
String countryName=selectedCountry.toString();
urlutf8Encoder=new URLUTF8Encoder();
String newCountry=urlutf8Encoder.encode(countryName);
pushToSearchResult(newCountry,countryName);//To Next SCreen
return true;
}
return false;
}
But it looks like:
The trackwheelClick event returns a boolean that indicates whether the event is consumed. Once an event is consumed, it stops propagating to other UI elements. If you return true, the menu will stop appearing.
Here I am display push notification in globalscreen in blackberry, I need to push screen by clicking OK button of the dialog. I want to start app by clicking the ok button.
Please help me.
Thanks in advance!
I'm not 100% sure I understand what you want, but if this doesn't work, just add a comment and I'll try to give you a better answer.
First, read this on pushing global screens
and this on performing actions after receiving global alerts
Your code, if I'm understanding correctly, should be similar to the second link's example.
Then, if you implement the DialogClosedListener, like in the second link, you might have something like this:
called from the background when you get notified:
Dialog myDialog = new Dialog(Dialog.D_OK_CANCEL, "Hello", Dialog.OK, null, 0);
myDialog.setDialogClosedListener(new MyListener());
UiApplication.getUiApplication().pushGlobalScreen(myDialog, 1, true);
implementation of your dialog listener:
private class MyListener implements DialogClosedListener {
public void dialogClosed(Dialog dialog, int choice) {
switch (choice) {
case Dialog.OK:
// ok clicked
UiApplication.getUiApplication().requestForeground();
break;
case Dialog.CANCEL:
// cancel clicked. or escape pressed
break;
default:
break;
}
}
}
And, then in your UiApplication class, you can respond to activation, which will happen if the user selects Ok from the Dialog:
public class MyApp extends UiApplication {
private boolean _nextScreenShowing = false;
public void activate() {
super.activate();
if (!_nextScreenShowing) {
pushScreen(new NextScreen());
_nextScreenShowing = true;
}
}
}
I show the _nextScreenShowing variable, just to make sure you think about whether pushing the next screen is appropriate. It probably won't be every time activate is called. You may need to keep track of that boolean flag by responding to the Application.deactivate() method, or maybe Screen.onExposed() or Screen.onObscured(). All that depends on how your app works.
My workFlow is like this ... I have taken Three HoriZontalManager one for holding theBackgroundImage of the button and two HoriZontalManager to hold the CustomButton and i am adding the main hfm which hold the button and the background image at top and then i have added the list in a VerticalfieldManager but i dont get the button Working the focus always remains on the list Field. Now when I click on the Button the focus always resides on the First row of the list Field so it always show me the picker which is actually i have implemented on the first row of listfield. How can i Solve it ..
Thanks in Advanced..
Please help.
I have solved This issue ... I had to check that if the focus is on the button then do my work else the list field will be invoked and it solved the issue. And it works for touchScreen simulator as well as trackpad devices.
protected boolean navigationClick(int status, int time) {
// if the row select do something with it
// for first row which is time
if(backCustomButton.isFocus()) {
UiApplication.getUiApplication().pushScreen(new saveScreen());
}else if (saveCustomButton.isFocus()) {
Dialog.inform("Save Button on focus");
}else
if (_list.getSelectedIndex() == 0){
// Do the ListSpecific things
}
I am using NullField() in one of my screen so that the default focus should not be on any of the button . but when i am clicking on the screen where no field is there , menu screen is being displayed. i dont want that menu screen to be poped up tough it should open when i click menu button.
Thanks alot
override method.
protected boolean navigationClick(int status, int time) {
Field focus = UiApplication.getUiApplication().getActiveScreen()
.getLeafFieldWithFocus();
if (focus instanceof NullField) {
return true;
}
return super.navigationClick(status, time);
}
Note:This code is only for giving you hint.