开发学院软件开发Java 使用J2ME搜索蓝牙设备,并与搜到的设备通信 阅读

使用J2ME搜索蓝牙设备,并与搜到的设备通信

 2009-09-12 00:00:00 来源:WEB开发网   
核心提示:由于代码来自我目前的项目,所以不能给出完整代码(非常多),使用J2ME搜索蓝牙设备,并与搜到的设备通信,只给出关键代码,对于一般J2ME程序员绝对看得懂!首先

由于代码来自我目前的项目,所以不能给出完整代码(非常多),只给出关键代码,对于一般J2ME程序员绝对看得懂!

首先,给出J2ME搜索蓝牙设备的代码:    

   1. public void commandAction(Command command, Displayable displayable) 
   2.  
   3.         { 
   4.  
   5.              if(command==cmd_Search) 
   6.  
   7.              { 
   8.  
   9.                  try  
  10.  
  11.                  { 
  12.  
  13.                      LocalDevice localDevice = LocalDevice.getLocalDevice(); 
  14.  
  15.                      DiscoveryAgent discoveryAgent = localDevice.getDiscoveryAgent(); 
  16.  
  17.                      discoveryAgent.startInquiry(DiscoveryAgent.GIAC,new MyDiscoveryListener(this)); 
  18.  
  19.                  }  
  20.  
  21.                  catch (Exception e)  
  22.  
  23.                  { 
  24.  
  25.                      MyClass.MessageBox("搜索出错,找不到蓝牙设备!", display); 
  26.  
  27.                      return; 
  28.  
  29.                  } 
  30.  
  31.                   
  32.  
  33.                  Menu.removeCommand(cmd_Search); 
  34.  
  35.              } 
  36.  
  37.         }  
  38.  
  39. } 
  40.  
  41.  
  42.  
  43.  
  44.  
  45. class MyDiscoveryListener implements DiscoveryListener { 
  46.  
  47.     //用于保存搜索到的设备 
  48.  
  49.     Vector devices = new Vector(); 
  50.  
  51.     SearchDevices midlet; 
  52.  
  53.      
  54.  
  55.     public MyDiscoveryListener(SearchDevices midlet) { 
  56.  
  57.         this.midlet = midlet; 
  58.  
  59.     } 
  60.  
  61.      
  62.  
  63.     public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) { 
  64.  
  65.         devices.addElement(btDevice); 
  66.  
  67.     } 
  68.  
  69.      
  70.  
  71.     public void inquiryCompleted(int discType) { 
  72.  
  73.             for (int i=0;i<devices.size();i++)  
  74.  
  75.             { 
  76.  
  77.                 RemoteDevice btDevice = (RemoteDevice)devices.elementAt(i); 
  78.  
  79.                 try  
  80.  
  81.                 { 
  82.  
  83.                     String device_address=btDevice.getBluetoothAddress();//取得蓝牙设备的全球唯一地址 
  84.  
  85.         }  
  86.  
  87.                 catch (Exception e) {e.printStackTrace();} 
  88.  
  89.             } 
  90.  
  91.     } 
  92.  
  93.     public void servicesDiscovered(int transID, ServiceRecord[] servRecord) {} 
  94.  
  95.     public void serviceSearchCompleted(int transID, int responseCode) {} 
  96.  
  97.      
  98.  
  99. } 
 100.  
 101.  
 102.  
 103. 接下来就是根据搜索所得的蓝牙设备地址来连接设备,并与设备通信: 
 104.  
 105. import java.io.DataInputStream; 
 106.  
 107. import java.io.DataOutputStream; 
 108.  
 109. import java.io.IOException; 
 110.  
 111. import javax.bluetooth.ServiceRecord; 
 112.  
 113. import javax.microedition.io.Connector; 
 114.  
 115. import javax.microedition.io.StreamConnection; 
 116.  
 117. import javax.microedition.lcdui.Command; 
 118.  
 119. import javax.microedition.lcdui.CommandListener; 
 120.  
 121. import javax.microedition.lcdui.Display; 
 122.  
 123. import javax.microedition.lcdui.Displayable; 
 124.  
 125. import javax.microedition.lcdui.Form; 
 126.  
 127. import javax.microedition.lcdui.TextField; 
 128.  
 129. import javax.microedition.midlet.MIDlet; 
 130.  
 131. import javax.microedition.midlet.MIDletStateChangeException; 
 132.  
 133.  
 134.  
 135. public class MIDlet_ConnDevice extends MIDlet  
 136.  
 137. implements  Runnable, CommandListener { 
 138.  
 139.     private Display display = null; 
 140.  
 141.  
 142.  
 143.      
 144.  
 145.     private Form form = new Form("蓝牙 "); 
 146.  
 147.     //用于输入要发送的消息 
 148.  
 149.     private TextField tfData = new TextField("请输入发送的消息", 
 150.  
 151.             "",255,TextField.ANY); 
 152.  
 153.      
 154.  
 155.     private Command cmdExit = new Command("退出", Command.EXIT, 0); 
 156.  
 157.     private Command cmdSend = new Command("发送", Command.SCREEN, 1); 
 158.  
 159.     private Command cmdConnect = new Command("连接", Command.SCREEN, 1); 
 160.  
 161.      
 162.  
 163.     //线程运行标志 
 164.  
 165.     private boolean isRunning = true; 
 166.  
 167.      
 168.  
 169.     StreamConnection client = null; 
 170.  
 171.     //服务器服务记录 
 172.  
 173.     ServiceRecord record=null; 
 174.  
 175.     private DataInputStream dis = null; 
 176.  
 177.     private DataOutputStream dos = null; 
 178.  
 179.     
 180.  
 181.     public MIDlet_ConnDevice() { 
 182.  
 183.         super(); 
 184.  
 185.         form.append(tfData); 
 186.  
 187.         form.addCommand(cmdExit); 
 188.  
 189.         form.addCommand(cmdConnect); 
 190.  
 191.         form.setCommandListener(this);   
 192.  
 193.     } 
 194.  
 195.     protected void startApp() throws MIDletStateChangeException { 
 196.  
 197.         display = Display.getDisplay(this); 
 198.  
 199.         display.setCurrent(form); 
 200.  
 201.     } 
 202.  
 203.  
 204.  
 205.     protected void pauseApp() { 
 206.  
 207.         isRunning = false; 
 208.  
 209.         close(); 
 210.  
 211.     } 
 212.  
 213.  
 214.  
 215.     protected void destroyApp(boolean arg0) 
 216.  
 217.         throws MIDletStateChangeException { 
 218.  
 219.         isRunning = false; 
 220.  
 221.         close(); 
 222.  
 223.     } 
 224.  
 225.      
 226.  
 227.     /**
 228. 
 229.      * 处理命令按钮事件
 230. 
 231.      */ 
 232.  
 233.     public void commandAction(Command cmd, Displayable d) { 
 234.  
 235.         if (cmd == cmdExit) {   
 236.  
 237.             isRunning = false; 
 238.  
 239.             notifyDestroyed(); 
 240.  
 241.         } else if(cmd == cmdSend) { 
 242.  
 243.             //发送数据 
 244.  
 245.             new Thread() { 
 246.  
 247.                 public void run() { 
 248.  
 249.                     if (dos == null) { 
 250.  
 251.                         return; 
 252.  
 253.                     } 
 254.  
 255.                     //把输入的字符串变为数字 
 256.  
 257.                         try {    
 258.  
 259.                                   
 260.  
 261.                             dos.writeUTF(tfData.getString());                      
 262.  
 263.                             dos.flush();                     
 264.  
 265.                         } catch (IOException e) {                         
 266.  
 267.                             form.append("Send error");          
 268.  
 269.                     } 
 270.  
 271.                 } 
 272.  
 273.             }.start(); 
 274.  
 275.         } else if (cmd == cmdConnect) { 
 276.  
 277.             //开始服务器线程 
 278.  
 279.             new Thread(this).start(); 
 280.  
 281.         } 
 282.  
 283.     }      
 284.  
 285.      
 286.  
 287.     /**
 288. 
 289.      * 客户端接收线程
 290. 
 291.      */ 
 292.  
 293.     public void run() { 
 294.  
 295.         isRunning = true; 
 296.  
 297.         client = null; 
 298.  
 299.         String device_address;//搜索所得的设备地址 
 300.  
 301.         String conURL = "btspp://"+device_address+":1"; 
 302.  
 303.         try { 
 304.  
 305.             client = (StreamConnection)Connector.open(conURL); 
 306.  
 307.             form.append("Connected!\n"); 
 308.  
 309.             dis = client.openDataInputStream(); 
 310.  
 311.             dos = client.openDataOutputStream(); 
 312.  
 313.             form.removeCommand(cmdConnect); 
 314.  
 315.             form.addCommand(cmdSend); 
 316.  
 317.         } catch (Exception e) { 
 318.  
 319.                 form.append("connect error"); 
 320.  
 321.                 close(); 
 322.  
 323.             return; 
 324.  
 325.         } 
 326.  
 327.         while(isRunning) { 
 328.  
 329.             try { 
 330.  
 331.                         if(dis.available()>1) 
 332.  
 333.                         { 
 334.  
 335.                             byte[] rec_package=new byte[dis.available()];//强烈建议这里使用byte[] 
 336.  
 337.                             dis.read(rec_package); 
 338.  
 339.                             String str=new String(rec_package); 
 340.  
 341.                         } 
 342.  
 343.             } 
 344.  
 345.                 catch (Exception e) { 
 346.  
 347.                        form.append("rec error"); 
 348.  
 349.                 break; 
 350.  
 351.             } 
 352.  
 353.         } 
 354.  
 355.         close(); 
 356.  
 357.         form.removeCommand(cmdSend); 
 358.  
 359.         form.addCommand(cmdConnect); 
 360.  
 361.     } 
 362.  
 363.      
 364.  
 365.     /**
 366. 
 367.      * 关闭连接
 368. 
 369.      */ 
 370.  
 371.     public void close() { 
 372.  
 373.         try { 
 374.  
 375.             if (dis != null) { 
 376.  
 377.                 dis.close(); 
 378.  
 379.                 dis = null; 
 380.  
 381.             } 
 382.  
 383.              
 384.  
 385.             if (dos != null) { 
 386.  
 387.                 dos.close(); 
 388.  
 389.                 dos = null; 
 390.  
 391.             } 
 392.  
 393.              
 394.  
 395.             if (client != null) { 
 396.  
 397.                 client.close(); 
 398.  
 399.                 client = null; 
 400.  
 401.             } 
 402.  
 403.         } catch (Exception e) { 
 404.  
 405.             e.printStackTrace(); 
 406.  
 407.         } 
 408.  
 409.     } 
 410.  
 411.  
 412.  
 413. } 

Tags:使用 JME 搜索

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