BlueCove,笔记本电脑和带蓝牙的Android平板电脑

时间:2012-06-29 12:09:01

标签: java android bluetooth bluecove

我正在尝试通过一个简单的应用程序获得使用蓝牙的基础知识。我也喜欢笔记本电脑应用程序,所以我可以简单地调试蓝牙通信。下面的代码是我尝试将笔记本电脑作为客户端(使用BlueCove 2.1.0),平板电脑作为服务器(Android 2.2)。

根据我的理解,这应该按照书面形式工作,笔记本电脑正在提供平板电脑及其提供的服务。但是,行"StreamConnection conn = (StreamConnection) Connector.open(url, Connector.READ_WRITE);"每次都返回null。

任何想法都出了什么问题?以下是代码的输出:

  

在winsock上的BlueCove版本2.1.0   地址:68A3C44A5265
  名称:WS1497
  启动设备查询...
  发现设备:2013E061D922
  发现设备:00242BFE7375
  INQUIRY_COMPLETED
  设备查询已完成。
  服务咨询开始。
  来自:Galaxy Tab
  服务搜索已完成 - 代码:1
  来自:WS1190
  服务搜索已完成 - 代码:4
  蓝牙设备:
  1. 2013E061D922(Galaxy Tab)
  2. 00242BFE7375(WS1190)
  btspp:// 2013E061D922:20; authenticate = false; encrypt = false; master = false ---- = null
  线程“main”中的异常java.lang.NullPointerException
    在MainClass.main(MainClass.java:104)
  BlueCove堆栈关闭完成了

以下是我正在使用的代码:

笔记本电脑代码:

import java.io.DataInputStream;
import java.io.IOException;
import java.util.Vector;

import javax.bluetooth.DeviceClass;
import javax.bluetooth.DiscoveryAgent;
import javax.bluetooth.DiscoveryListener;
import javax.bluetooth.LocalDevice;
import javax.bluetooth.RemoteDevice;
import javax.bluetooth.ServiceRecord;
import javax.bluetooth.UUID;
import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;

public class MainClass implements DiscoveryListener {

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

// vector containing the devices discovered
private static Vector<RemoteDevice> vecDevices = new Vector<RemoteDevice>();
private static Vector<String> vecServices = new Vector<String>();

// main method of the application
public static void main(String[] args) throws IOException {

    // create an instance of this class
    MainClass bluetoothDeviceDiscovery = new MainClass();

    // 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, bluetoothDeviceDiscovery);

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

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

    UUID uuids[] = new UUID[1];
    uuids[0] = new UUID("fa87c0d0afac11de8a390800200c9a66", false);

    for (RemoteDevice rd : vecDevices) {
        System.out.println("From: " + rd.getFriendlyName(false));
        agent.searchServices(null, uuids, rd, bluetoothDeviceDiscovery);
        try {
            synchronized (lock) {
                lock.wait();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

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

    if (deviceCount <= 0) {
        System.out.println("No Devices Found .");
    } 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(false) + ")");
        }
    }

    // System.out.println("SR: " + sr.toString());
    for (String url : vecServices) {
        try {
            String url = sr
                    .getConnectionURL(
                            ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false);
            StreamConnection conn = (StreamConnection) Connector.open(url, Connector.READ_WRITE);
            System.out.println(url + " ----=" + conn);
            DataInputStream din = new DataInputStream(
                    conn.openDataInputStream());
            synchronized (lock) {
                try {
                    lock.wait(10);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            while (din.available() != 0) {
                System.out.print(din.readChar());
            }
            System.out.println();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}// end main

// methods of DiscoveryListener

/**
 * This call back method will be called for each discovered bluetooth
 * devices.
 */
public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) {
    System.out.println("Device discovered: "
            + btDevice.getBluetoothAddress());
    // add the device to the vector
    if (!vecDevices.contains(btDevice)) {
        vecDevices.addElement(btDevice);
    }
}

// no need to implement this method since services are not being discovered
public void servicesDiscovered(int transID, ServiceRecord[] servRecord) {
    for (ServiceRecord sr : servRecord) {
        vecServices.add(sr.getConnectionURL(ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false));
    }
}

// no need to implement this method since services are not being discovered
public void serviceSearchCompleted(int transID, int respCode) {
    System.out.println("Service search completed - code: " + respCode);
    synchronized (lock) {
        lock.notify();
    }
}

/**
 * This callback method will be called when the device discovery is
 * completed.
 */
public void inquiryCompleted(int discType) {
    switch (discType) {
    case DiscoveryListener.INQUIRY_COMPLETED:
        System.out.println("INQUIRY_COMPLETED");
        break;

    case DiscoveryListener.INQUIRY_TERMINATED:
        System.out.println("INQUIRY_TERMINATED");
        break;

    case DiscoveryListener.INQUIRY_ERROR:
        System.out.println("INQUIRY_ERROR");
        break;

    default:
        System.out.println("Unknown Response Code");
        break;
    }
    synchronized (lock) {
        lock.notify();
    }
}// end method
}// end class

机器人:

package com.mira.Bluetooth;

import java.io.IOException;

import java.util.UUID;

import android.app.Activity;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;

import android.os.Bundle;

import android.util.Log;

public class BluetoothAndroidActivity extends Activity implements Runnable {
    BluetoothServerSocket bss;
    Thread t;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        BluetoothAdapter bta = BluetoothAdapter.getDefaultAdapter();

        for (BluetoothDevice btd : bta.getBondedDevices()) {
            Log.i("Bluetooth Device Found",
                  btd.toString() + "; " + btd.getName());
        }

        try {
            bss =
bta.listenUsingRfcommWithServiceRecord("BluetoothChat", UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66"));
            t = new Thread(this);
            t.start();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        boolean bContinue = true;
        while (bContinue) {
            try {
                Thread.sleep(100);
            } catch (Exception e) {

            }

            try {
                System.out.println("Listening for connection");
                BluetoothSocket bs = bss.accept();
                System.out.println("Connection received");
                bs.getOutputStream().write("Hello BlueTooth World".getBytes());
                bs.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                bContinue = false;
            }
        }
    }

    /*
 * (non-Javadoc)
 *
 * @see android.app.Activity#onDestroy()
 */

    @Override
    protected void onStop() {
        try {
            System.out.println("Killing ServerSocket");
            bss.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        super.onStop();
    }
}

2 个答案:

答案 0 :(得分:1)

这是一个老问题,所以我不知道是否有人仍在寻找答案,但无论如何这里都是...... :)。您询问的行是返回null,因为url为空。试试这个UUID而不是代码中的UUID:0000110100001000800000805f9b34fb

答案 1 :(得分:0)

经过很长一段时间后的更新 - 事实证明,蓝牙要求UUID采用“0000xxxx0000100000080805f9b34fb”的形式,这确实提出了为什么不使用16位标识符而不是128位UUID的问题,但没关系。 / p>

我不知道BlueCove是否可以在我的笔记本电脑上使用它,但我最近在我的笔记本电脑上使用Linux和'Bluez'的实验表明该形式的任何UUID都有效。 Android可能应该在他们的文档中包含它作为某种说明。