Question

我需要通过蓝牙将字符串从PC传输到Android移动设备来获得帮助。 Android移动设备应充当服务器并在设备屏幕上显示字符串消息。作为客户端的PC应该将字符串发送到移动设备。

我希望服务器对提取的字符串做出反应（通过蓝牙传输）。这意味着一方面服务器总是必须监听新的字符串到达，但另一方面仍然必须能够对这些消息作出反应（例如，从一个菜单导航到另一个菜单）。

我尝试使用BlueCove（2.1.1）作为BluetoothStack（我将BlueCove中的jar作为库添加到两个项目中）并结合我发现的服务器 - 客户端通信示例{{3} }。

更新

使用服务器的RFComm连接感谢 user_CC ，从服务器更新了代码：

public class RFCommServer extends Thread{

//based on java.util.UUID
private static UUID MY_UUID = UUID.fromString("446118f0-8b1e-11e2-9e96-0800200c9a66");

// The local server socket
private BluetoothServerSocket mmServerSocket;

// based on android.bluetooth.BluetoothAdapter
private BluetoothAdapter mAdapter;
private BluetoothDevice remoteDevice;

private Activity activity;

public RFCommServer(Activity activity) {
    this.activity = activity;
}

public void run() {
    BluetoothSocket socket = null;
    mAdapter = BluetoothAdapter.getDefaultAdapter();        

    // Listen to the server socket if we're not connected
    while (true) {

        try {
            // Create a new listening server socket
            Log.d(this.getName(), ".....Initializing RFCOMM SERVER....");

            // MY_UUID is the UUID you want to use for communication
            mmServerSocket = mAdapter.listenUsingRfcommWithServiceRecord("MyService", MY_UUID);
            //mmServerSocket = mAdapter.listenUsingInsecureRfcommWithServiceRecord(NAME, MY_UUID); // you can also try using In Secure connection...

            // This is a blocking call and will only return on a
            // successful connection or an exception
            socket = mmServerSocket.accept();

        } catch (Exception e) {

        }

        try {
            Log.d(this.getName(), "Closing Server Socket.....");
            mmServerSocket.close();

            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            // Get the BluetoothSocket input and output streams

            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();

            DataInputStream mmInStream = new DataInputStream(tmpIn);
            DataOutputStream mmOutStream = new DataOutputStream(tmpOut);

            // here you can use the Input Stream to take the string from the client whoever is connecting
            //similarly use the output stream to send the data to the client

            RelativeLayout layout = (RelativeLayout) activity.findViewById(R.id.relativeLayout_Layout);
            TextView text = (TextView) layout.findViewById(R.id.textView_Text);

            text.setText(mmInStream.toString());
        } catch (Exception e) {
            //catch your exception here
        }
    }
}

来自here的SPP客户端代码：

/**
* A simple SPP client that connects with an SPP server
*/
public class SampleSPPClient implements DiscoveryListener{

//object used for waiting
private static Object lock=new Object();

//vector containing the devices discovered
private static Vector vecDevices=new Vector();

private static String connectionURL=null;

public static void main(String[] args) throws IOException {

    SampleSPPClient client=new SampleSPPClient();

    //display local device address and name
    LocalDevice localDevice = LocalDevice.getLocalDevice();
    System.out.println("Address: "+localDevice.getBluetoothAddress());
    System.out.println("Name: "+localDevice.getFriendlyName());

    //find devices
    DiscoveryAgent agent = localDevice.getDiscoveryAgent();

    System.out.println("Starting device inquiry...");
    agent.startInquiry(DiscoveryAgent.GIAC, client);

    try {
        synchronized(lock){
            lock.wait();
        }
    }
    catch (InterruptedException e) {
        e.printStackTrace();
    }


    System.out.println("Device Inquiry Completed. ");

    //print all devices in vecDevices
    int deviceCount=vecDevices.size();

    if(deviceCount <= 0){
        System.out.println("No Devices Found .");
        System.exit(0);
    }
    else{
        //print bluetooth device addresses and names in the format [ No. address (name) ]
        System.out.println("Bluetooth Devices: ");
        for (int i = 0; i <deviceCount; i++) {
            RemoteDevice remoteDevice=(RemoteDevice)vecDevices.elementAt(i);
            System.out.println((i+1)+". "+remoteDevice.getBluetoothAddress()+" ("+remoteDevice.getFriendlyName(true)+")");
        }
    }

    System.out.print("Choose Device index: ");
    BufferedReader bReader=new BufferedReader(new InputStreamReader(System.in));

    String chosenIndex=bReader.readLine();
    int index=Integer.parseInt(chosenIndex.trim());

    //check for spp service
    RemoteDevice remoteDevice=(RemoteDevice)vecDevices.elementAt(index-1);
    UUID[] uuidSet = new UUID[1];
    uuidSet[0]=new UUID("446118f08b1e11e29e960800200c9a66", false);

    System.out.println("\nSearching for service...");
    agent.searchServices(null,uuidSet,remoteDevice,client);

    try {
        synchronized(lock){
            lock.wait();
        }
    }
    catch (InterruptedException e) {
        e.printStackTrace();
    }

    if(connectionURL==null){
        System.out.println("Device does not support Simple SPP Service.");
        System.exit(0);
    }

    //connect to the server and send a line of text
    StreamConnection streamConnection=(StreamConnection)Connector.open(connectionURL);

    //send string
    OutputStream outStream=streamConnection.openOutputStream();
    PrintWriter pWriter=new PrintWriter(new OutputStreamWriter(outStream));
    pWriter.write("Test String from SPP Client\r\n");
    pWriter.flush();


    //read response
    InputStream inStream=streamConnection.openInputStream();
    BufferedReader bReader2=new BufferedReader(new InputStreamReader(inStream));
    String lineRead=bReader2.readLine();
    System.out.println(lineRead);


}//main

//methods of DiscoveryListener
public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) {
    //add the device to the vector
    if(!vecDevices.contains(btDevice)){
        vecDevices.addElement(btDevice);
    }
}

//implement this method since services are not being discovered
public void servicesDiscovered(int transID, ServiceRecord[] servRecord) {
    if(servRecord!=null && servRecord.length>0){
        connectionURL=servRecord[0].getConnectionURL(0,false);
    }
    synchronized(lock){
        lock.notify();
    }
}

//implement this method since services are not being discovered
public void serviceSearchCompleted(int transID, int respCode) {
    synchronized(lock){
        lock.notify();
    }
}


public void inquiryCompleted(int discType) {
    synchronized(lock){
        lock.notify();
    }

}//end method

}

为了测试，我使用Galaxy Nexus（GT-I9250）和最新的Android API。

感谢 user_CC ，客户端和服务器现在无异常地运行。但遗憾的是客户端无法连接到服务器（请参阅下面的屏幕截图）。这是因为永远不会设置connectionURL（因此默认情况下它会跳到if(connectionURL==null)。

如何更改客户端代码，以便实际上可以将其与服务器连接？我需要在以下行中使用正确的connectionURL：

StreamConnection streamConnection=(StreamConnection)Connector.open(connectionURL)

到目前为止，我只发现我需要获取ServiceRecord，遗憾的是，here的示例代码中也未对此进行描述。

enter image description here

Answer 1

您需要使用RFComm APIS进行通信工作，我已经设法定义了一个类，它是一个线程，并将充当服务器并监听客户端连接。我还提出了一些意见供你理解。

    private class AcceptThread extends Thread {
    // The local server socket
    private BluetoothServerSocket mmServerSocket;

    public AcceptThread() {
    }

    public void run() {         
        BluetoothSocket socket = null;

                    BluetoothAdapter mAdapter = BluetoothAdapter.getDefaultAdapter();

        // Listen to the server socket if we're not connected
        while (true) {

            try {
                // Create a new listening server socket
                Log.d(TAG, ".....Initializing RFCOMM SERVER....");

                // MY_UUID is the UUID you want to use for communication
                mmServerSocket = mAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);                    
                //mmServerSocket = mAdapter.listenUsingInsecureRfcommWithServiceRecord(NAME, MY_UUID);  you can also try using In Secure connection...

                // This is a blocking call and will only return on a
                // successful connection or an exception                    
                socket = mmServerSocket.accept();                   

            } catch (Exception e) {

            }

            try {
                Log.d(TAG, "Closing Server Socket.....";                    
                mmServerSocket.close();



                InputStream tmpIn = null;
                OutputStream tmpOut = null;

                // Get the BluetoothSocket input and output streams

                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();


                mmInStream = new DataInputStream(tmpIn);
                mmOutStream = new DataOutputStream(tmpOut); 

                // here you can use the Input Stream to take the string from the client whoever is connecting
                //similarly use the output stream to send the data to the client
            } catch (Exception e) {
                //catch your exception here
            }

        }
    }

}

我希望这会有所帮助

换个问题：

在客户端（PC）上声明javax.bluetooth.UUID UUID类应该来自javax.bluetooth.UUID

   uuidSet2[0] = new UUID("446118f08b1e11e29e960800200c9a66", false);

在服务器端（Android）声明java.util.UUID

    UUID MY_UUID = UUID.fromString("446118f0-8b1e-11e2-9e96-0800200c9a66");

Answer 2

我不是Java开发人员，但是Mono for Android（c＃）也有类似的问题

SPP的UUID应为"00001101-0000-1000-8000-00805F9B34FB"
这是一个众所周知的UID，用于识别蓝牙SPP适配器。

在我看来像

的c＃代码中

private static UUID MY_UUID = UUID.FromString("00001101-0000-1000-8000-00805F9B34FB");

我猜你可以将你的Java代码更新为：

new UUID("00001101-0000-1000-8000-00805F9B34FB", true);

虽然我不确定函数接受哪些参数，但您可能需要检查它。

我使用的是Android设备作为客户端，但这些信息对您有用，
所以我会在这里包含我最初从Java样本翻译的c＃代码，所以你应该能够将它翻译回来：

btAdapter = BluetoothAdapter.DefaultAdapter;

btAdapter.CancelDiscovery(); //Always call CancelDiscovery before doing anything
remoteDevice = btAdapter.GetRemoteDevice(Settings["deviceaddress"].ToString());

socket = remoteDevice.CreateRfcommSocketToServiceRecord(MY_UUID);
socket.Connect();

基本上我得到默认适配器，取消任何正在运行的发现操作然后为其他设备创建一个套接字。在你的情况下，你会想听，而不是连接，但只是为了你的信息。

我希望它有所帮助，抱歉，我无法向您提供更多Java特定信息。

'更新：'刚刚在Java中找到了一个或多或少遵循相同方法的小样本就像我正在使用的那样：Problems with connecting bluetooth SPP in android?

通过蓝牙从作为客户端的PC向作为服务器的移动设备发送字符串

更新

2 个答案: