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40
BlackBerry Java Development Environment Development Guide
Define a layout manager
Set field focus and navigation
UI EventListeners let applications respond to a change to a UI object.
Listen for field focus changes
1. Implement FocusChangeListener. Your implementation of FocusChangeListener should specify what
action occurs when the field gains, loses, or changes the focus by implementing
focusChanged().
2. Assign your implementation to a Field by invoking setChangeListener().
private class FocusListener implements FocusChangeListener {
public void focusChanged(Field field, int eventType) {
if (eventType == FOCUS_GAINED) {
// Perform action when this field gains the focus.}
if (eventType == FOCUS_CHANGED) {
// Perform action when the focus changes for this field.}
if (eventType == FOCUS_LOST) {
// Perform action when this field loses focus.}
}
}
FocusListener myFocusChangeListener = new FocusListener();
myField.setFocusListener(myFocusChangeListener);
Respond to UI events
Task Steps
Create a layout manager. On an instance of a Screen, complete the following actions:
1. Instantiate the appropriate Manager subclass.
VerticalFieldManager vfm = new
VerticalFieldManager(Manager.VERTICAL_SCROLL);
2. Add UI components to the layout manager.
vfm.add(bitmapField);
vfm.add(bitmapField2);
3. Add the layout manager to the screen.
mainScreen.add(vfm)
Task Steps
Respond to UI navigation events. > Manage navigation events by extending the net.rim.device.api.ui.Screen class (or one
of its subclasses) and overriding the following navigation methods:
• navigationClick(int status, int time)
• navigationUnclick(int status, int time)
• navigationMovement(int dx, int dy, int status, int time)
• When you create a new UI application, use the new Screen navigation methods and avoid using the
TrackwheelListener
.
• If the existing UI application implements the TrackwheelListener, update the application to use
the new
Screen navigation methods.
- BlackBerry Java Development 1
- Environment 1
- Contents 5
- Creating UIs 13
- UI components 14
- Create a screen 15
- Creating custom UI components 17
- Create a custom field 18
- 1: Creating UIs 19
- Create custom context menus 26
- Create custom layout managers 29
- Example: DiagonalManager.java 30
- return index; 32
- Create custom lists 33
- Create a menu item 36
- Register a menu item 36
- Example: DemoAppMenuItem.java 37
- Arrange UI components 38
- Respond to UI events 40
- Manage foreground events 43
- Manage drawing areas 43
- Using graphics and multimedia 45
- Use encoded images 46
- Example: ImageDemo.java 47
- Drawing and rendering images 48
- Example: DrawDemo.java 50
- Using audio 51
- Example: Sequence of tones 52
- Play media 54
- Using rich media 55
- Example: MediaSample.java 56
- Listen for rich media events 57
- Example: MediaSample2.java 60
- Storing data 65
- Manage persistent data 66
- 3: Storing data 67
- Example: UserInfo.java 67
- Manage custom objects 69
- Example: Restaurants.java 71
- Use the MIDP record store 75
- Managing data 77
- Backing up and restoring data 78
- 4: Managing data 79
- Access a SyncCollection 80
- Using SyncObjects 82
- Example: RestaurantsSync.java 89
- Using smart cards 97
- 5: Using smart cards 101
- Managing memory 115
- Use the LMM 116
- Free persistent objects 116
- Creating connections 117
- Use HTTP connections 118
- Example: HTTPFetch.java 119
- 7: Creating connections 119
- Use HTTP authentication 122
- Use HTTPS connections 125
- Use socket connections 125
- Datagram connections 126
- Using port connections 128
- Creating notifications 135
- Add a new event source 136
- Code sample: 137
- Triggering events 139
- Respond to deferred events 140
- Cancel events 141
- 8: Creating notifications 143
- Example: ConsequenceDemo.java 143
- Managing applications 147
- Managing code modules 149
- Retrieve module information 150
- Create code modules 150
- Runtime store 151
- Share runtime objects 151
- Create new messages 153
- Work with a message 155
- Send a message 156
- Reply to a message 157
- Work with folders 158
- Working with attachments 160
- Using PIM applications 163
- Use the calendar 164
- 11: Using PIM applications 165
- ContactsDemo.java 167
- Using the address book 170
- Example: ContactsDemo.java 175
- Using tasks 178
- Use tasks 179
- Using the phone application 185
- BlackBerry DTMF tones 186
- Listen for phone events 187
- Access and use call logs 187
- Example: PhoneLogsDemo.java 188
- Using the BlackBerry Browser 191
- Using location information 199
- Location document tags 200
- Location document structure 200
- Creating push applications 215
- Types of push requests 216
- Example: HTTPPushDemo.java 218
- Create a RIM push request 225
- Create a PAP push request 226
- BlackBerry device 227
- Localizing applications 235
- Add localization support 236
- 16: Localizing applications 237
- Example: CountryInfo.java 237
- Testing applications 245
- Debugging applications 246
- 17: Testing applications 247
- Manage a debugging session 248
- Locate a memory leak 250
- Display format 251
- View local variables 252
- View static data 252
- View threads 253
- View the call stack 254
- View event logs 254
- View classes 255
- Generate profile data 256
- Analyze code coverage 257
- Run the Coverage tool 258
- View source code 258
- Approve HTTP connections 258
- Load and remove applications 260
- View application information 261
- Preverify applications 263
- Request code signatures 265
- View signature status 266
- Distribute applications 267
- Software 269
- Specify optional components 270
- WAP Push DTDs 276
- Appendix: .alx files 277
- Appendix: .alx files 279
- Set .cod file dependencies 281
- Acronym list 283
- Published in Canada 286
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