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7: Creating connections
Task Steps
Before opening a datagram connection,
verify that the BlackBerry® device is in
a wireless coverage area.
>Use the CoverageInfo class and CoverageStatusListener interface of the
net.rim.device.api.system package to make sure that the BlackBerry device is in a
wireless coverage area.
Even though the CoverageInfo class and the CoverageStatusListener interface can
determine if the BlackBerry device that your application is on is in a wireless coverage area,
they cannot guarantee that a subsequent network connection will be successful.
Open a datagram connection. 1. Invoke Connector.open(), specifying udp as the protocol.
2. Cast the returned object as a DatagramConnection object.
(DatagramConnection)Connector.open("udp://host:dest_port[;src_port]/
apn");
where:
• host is the host address in dotted ASCII-decimal format.
• dest-port is the destination port at the host address (optional for receiving messages).
• src-port is the local source port (optional).
• apn is the network APN in string format.
Receive datagrams from all ports at the
specified host.
> Omit the destination port in the connection string.
Open a datagram connection on a non-
GPRS network.
> Specify the source port number, including the trailing slash mark.
For example, the address for a CDMA network connection would be udp://
121.0.0.0:2332;6343/.
You can send and receive datagrams on the same port number.
Create a datagram. >Invoke DatagramConnection.newDatagram().
Datagram outDatagram = conn.newDatagram(buf, buf.length);
Add data to a datagram. >Invoke Datagram.setData().
byte[] buf = new byte[256];
outDatagram.setData(buf, buf.length);
Send data on the datagram connection. >Invoke send() on the datagram connection.
conn.send(outDatagram);
If an application attempts to send a datagram on a datagram connection and the recipient is
not listening on the specified source port number, an
IOException is thrown. Make sure that
the application implements exception handling.
Receive data on the datgram connection. >Invoke receive() on the datagram connection. Since the receive() method blocks other
operations until it receives a data packet, use a timer to retransmit the request or close the
connection if a reply does not arrive.
byte[] buf = new byte[256];
Datagram inDatagram = conn.newDatagram(buf, buf.length);
conn.receive(inDatagram);
Extract data from a datagram. >Invoke getData(). If you know the type of data that you are receiving, convert the data to
the appropriate format.
String received = new String(inDatagram.getData());
Close the datagram connection. >Invoke close() on the input and output streams and on the datagram connection object.
- 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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