安卓藍牙服務發現失敗例外

Question

試圖解決這個問題的最近2天。我在這個論壇上看到這個主題的很多解決方案，並嘗試其中的大多數，如This和This，但沒有運氣。因此，我問關於這個話題的新問題。所以任何人都可以指導我如何解決這個問題？特別是我認爲我不能使用正確的UUID（儘管我使用標準UUID 00001101-0000-1000-8000-00805F9B34FB）連接我的服務器PC（用java編寫）和客戶端Android。

服務器代碼（JAVA）：

public class Main { 


    private final LocalDevice mLocalDevice; 
    public static void main(String[] args) throws IOException, InterruptedException 
    { 
     new Main().start(); 
    } 

    public Main() throws IOException 
    { 
     mLocalDevice = LocalDevice.getLocalDevice(); 
     mLocalDevice.setDiscoverable(DiscoveryAgent.GIAC); 
    } 

    public void start() throws IOException 
    { 
     StreamConnectionNotifier connectionNotifier =(StreamConnectionNotifier) Connector.open("btspp://localhost:" + 
                   "0000110100001000800000805F9B34FB;name=BtExample;" + 
                    "authenticate=false;encrypt=false;master=false"); 

     System.out.println("accepting on " + mLocalDevice.getBluetoothAddress()); 
     StreamConnection streamConnection = connectionNotifier.acceptAndOpen(); 
     DataInputStream is = streamConnection.openDataInputStream(); 

     byte[] bytes = new byte[1024]; 
     int r; 
     while ((r = is.read(bytes)) > 0) 
     { 
      System.out.println(new String(bytes, 0, r)); 
     } 
     streamConnection.close(); 
    } 

} 

客戶端代碼（安卓）：

try { 
     mBtAdapter = BluetoothAdapter.getDefaultAdapter(); 
     Log.d("BT", "getting local device"); 
      // remote MAC here: 
     BluetoothDevice device =mBtAdapter.getRemoteDevice("My_Computer_bluetooth_Address"); 
     Log.d("BT", "remote device: "+ device.getName().toString()); 
     Log.d("BT", "connecting to service"); 

     //Process process = Runtime.getRuntime().exec("su -c 'sdptool records " + device.getAddress() + "'"); 
     //Log.d("BT", process.toString()); 
     //Method m = device.getClass().getMethod("createRfcommSocket", new Class[] {int.class}); 
     //socket = (BluetoothSocket) m.invoke(device, 1);//I also tried this,but same exception occurs 
     //sock=socket; 
     BluetoothSocket socket = device.createInsecureRfcommSocketToServiceRecord(
      UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")); 
     Log.d("BT", "about to connect"); 

     mBtAdapter.cancelDiscovery(); 
     socket.connect(); 
     Log.d("BT", "Connected!"); 

     socket.getOutputStream().write("Hello, world!".getBytes()); 

} catch (Exception e) { 
     Log.e("BT", "Error connecting to device", e); 
} 

logcat的異常瀏覽：

02-15 14:12:02.022: D/BT(4798): getting local device 
02-15 14:12:02.023: D/BT(4798): remote device: SHUVRO-PC //my PC name 
02-15 14:12:02.023: D/BT(4798): connecting to service 
02-15 14:12:02.024: I/BluetoothSocket_MTK(4798): [JSR82] Bluetooth Socket Constructor 
02-15 14:12:02.024: I/BluetoothSocket_MTK(4798): [JSR82] type=1 fd=-1 auth=false encrypt=false port=-1 
02-15 14:12:02.026: D/BT(4798): about to connect 
02-15 14:12:02.055: I/BluetoothSocket_MTK(4798): [JSR82] connect: do SDP 
02-15 14:12:08.057: I/BluetoothSocket_MTK(4798): [JSR82] SdpHelper::onRfcommChannelFound: channel=-1 
02-15 14:12:08.059: E/BT(4798): Error connecting to device 
02-15 14:12:08.059: E/BT(4798): java.io.IOException: Service discovery failed 
02-15 14:12:08.059: E/BT(4798):  at android.bluetooth.BluetoothSocket$SdpHelper.doSdp(BluetoothSocket.java:813) 
02-15 14:12:08.059: E/BT(4798):  at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:382) 
02-15 14:12:08.059: E/BT(4798):  at com.bluetoothTest.BluetoothTestActivity.onClick(BluetoothTestActivity.java:82) 
02-15 14:12:08.059: E/BT(4798):  at android.view.View.performClick(View.java:3517) 
02-15 14:12:08.059: E/BT(4798):  at android.view.View$PerformClick.run(View.java:14155) 
02-15 14:12:08.059: E/BT(4798):  at android.os.Handler.handleCallback(Handler.java:605) 
02-15 14:12:08.059: E/BT(4798):  at android.os.Handler.dispatchMessage(Handler.java:92) 
02-15 14:12:08.059: E/BT(4798):  at android.os.Looper.loop(Looper.java:137) 
02-15 14:12:08.059: E/BT(4798):  at android.app.ActivityThread.main(ActivityThread.java:4508) 
02-15 14:12:08.059: E/BT(4798):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-15 14:12:08.059: E/BT(4798):  at java.lang.reflect.Method.invoke(Method.java:511) 
02-15 14:12:08.059: E/BT(4798):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809) 
02-15 14:12:08.059: E/BT(4798):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576) 
02-15 14:12:08.059: E/BT(4798):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

下面是我在客戶端用來建立（安全或不安全）連接的最終代碼。在我的用例中：一個非平凡的pinCode意味着目標設備需要安全連接，否則目標設備會接受不安全的連接。

我覺得這個代碼需要API級別15+

private BluetoothAdapter mBluetoothAdapter; 
public final String BT_UUID = "00001101-0000-1000-8000-00805F9B34FB"; 
private BluetoothDevice bluetoothDevice; 
private BluetoothSocket socket; 

... 

public void establishBluetoothConnection(String pinCode) throws IOException { 
    //needed because "bluetooth device discovery" may initiated by any other 
    // process and there are good chances that the socket.connect() fail when bluetooth discovery process is running. 
    mBluetoothAdapter.cancelDiscovery(); 

    if ("".equals(pinCode) || pinCode == null || "0000".equals(pinCode)) { 
     socket = bluetoothDevice.createInsecureRfcommSocketToServiceRecord(UUID.fromString(BT_UUID)); 
    } else { 
     setPin(pinCode); 
     socket = bluetoothDevice.createRfcommSocketToServiceRecord(UUID.fromString(BT_UUID)); 
    } 
    socket.connect(); //blocking up to timeout of about 12 sec. throws IOException in case of failure 
} 



/** 
* hack to set the pin code programatically. The android API don't have a public method to set the pin code. 
* that's why we use this hack. In case of failure: android will prompt the user to enter the pin code manually. 
*/ 
private void setPin(String pinCode) { 
    try { 
     byte[] ar = pinCode.getBytes(); 
     Method m2 = bluetoothDevice.getClass().getMethod("setPin", new Class[]{byte[].class}); 
     m2.invoke(bluetoothDevice, ar); 
    } catch (NoSuchMethodException e) { 
     Log.e("Bluetooth", "Failed to set pin code", e); 
    } catch (InvocationTargetException e) { 
     Log.e("Bluetooth", "Failed to set pin code", e); 
    } catch (IllegalAccessException e) { 
     Log.e("Bluetooth", "Failed to set pin code", e); 
    } 
}