通過藍牙從作為客戶端的PC向作為服務器的移動設備發送字符串

Question

我需要通過藍牙將字符串從PC傳輸到Android移動設備來獲得幫助。 Android移動設備應充當服務器並在設備屏幕上顯示字符串消息。 作為客戶端的PC應該將字符串發送到移動設備。

我希望服務器對提取的字符串做出反應（通過藍牙傳輸）。 這意味着在一側服務器總是必須監聽新的字符串到達​​，但另一方面仍然必須能夠對這些消息作出反應（例如，從一個菜單導航到另一個菜單）。

我嘗試使用BlueCove（2.1.1）作為BluetoothStack（我將BlueCove中的jar作為庫添加到兩個項目中）並結合我在此處找到的服務器 - 客戶端通信示例。

更新：

由於user_CC使用服務器的RFComm連接，服務器更新了代碼：

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
        }
    }
}

從SPP客戶端的代碼在這里 ：

/**
* 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

}

為了測試，我使用Galaxy Nexus（GT-I9250）和最新的Android API。

由於user_CC ，客戶端和服務器現在無異常地運行。 但遺憾的是客戶端無法連接到服務器（請參閱下面的屏幕截圖）。 這是因為connectionURL永遠不會被設置（因此默認情況下它會跳轉到if(connectionURL==null) 。

如何更改客戶端代碼，以便我實際上可以將其與服務器連接？ 我需要在以下行中使用正確的connectionURL ：

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

到目前為止，我只發現我需要得到ServiceRecord ，遺憾的是， 這里的示例代碼中也沒有描述。

Answer 1

您需要使用RFComm APIS來完成我已經設法的通信工作，以定義一個類，該類是一個線程，並將充當服務器並偵聽客戶端連接。 我還提出了一些意見供你理解。

    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
            }

        }
    }

}

我希望這有幫助

對於你的另一個問題：

在客戶端（PC）UUID類上聲明javax.bluetooth.UUID應該來自javax.bluetooth.UUID

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

在服務器端聲明java.util.UUID（Android）

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

Answer 2

我不是Java開發人員，但我在使用Mono for Android時遇到了類似的問題（c＃）

SPP的UUID應為"00001101-0000-1000-8000-00805F9B34FB"
這是用於識別藍牙SPP適配器的眾所周知的UID。

在我看來的c＃代碼中

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

我猜你可以將你的Java代碼更新為：

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

雖然我不確定函數接受哪些參數，但您可能需要檢查它。

我使用Android設備作為客戶端，但這些信息對您有用，
所以我將在這里包含我最初從Java樣本翻譯的c＃代碼，
所以你應該能夠將它翻譯回來：

btAdapter = BluetoothAdapter.DefaultAdapter;

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

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

基本上我得到默認適配器，取消任何正在運行的發現操作，然后創建一個到另一個設備的套接字。 在你的情況下，你會想聽，而不是連接，但只是為了你的信息。

我希望它有所幫助，抱歉，我無法向您提供更多Java特定信息。

'更新：'剛剛在Java中發現了一個小樣本，它或多或少遵循與我正在使用的方法相同的方法： 在android中連接藍牙SPP的問題？