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蓝牙,BlueCove和Raspberry PI

[英]Bluetooth, BlueCove and Raspberry PI

我在RaspberryPI上使用Java使用BlueJ进行设置,并使用Blueman进行了蓝牙设置,并且正在使用BlueCove API。

我从以下示例中获取了RemoteDeviceDiscovery示例:

http://bluecove.org/bluecove/apidocs/overview-summary.html#DeviceDiscovery

当我从BlueJ中运行示例时,我得到:

“等待设备查询完成...设备查询完成!找到0个设备”,当我从终端窗口运行时,使用:

pi @ raspberrypi〜/ java / bluetooth_jar $ / usr / lib / jvm / jdk-8-oracle-arm-vfp-hflt / jre / bin / java -jar bluetooth_jar.jar

我得到:

“ bluez上的BlueCove版本2.1.1-SNAPSHOT BluetoothStateException异常:javax.bluetooth.BluetoothStateException:蓝牙设备未准备好。[1]不允许操作BlueCove堆栈关闭已完成”

为什么在使用BlueJ时未引发异常,我不明白,但是在命令行中,由于设备未准备好,它似乎无法检测附近的设备。 但是,我不明白此错误消息,因为我可以使用Blueman Manager将文件发送到附近的Android平板电脑和Win7笔记本电脑。

import java.io.IOException;

导入java.util.ArrayList; 导入javax.bluetooth。*;

/ ** *最小设备发现示例。 * /公共类RemoteDeviceDiscovery {

protected ArrayList<RemoteDevice> devicesDiscovered = new ArrayList();
protected final Object inquiryCompletedEvent = new Object();

public RemoteDeviceDiscovery()
{
    DiscoveryListener listener = new MyDiscoveryListener();

    synchronized(inquiryCompletedEvent) {
        try
        {
            LocalDevice local = LocalDevice.getLocalDevice();
            local.setDiscoverable(DiscoveryAgent.GIAC);
            DiscoveryAgent discoveryAgent = local.getDiscoveryAgent();
            // note: GIAC: The inquiry access code for General/Unlimited Inquiry Access Code (GIAC).
            boolean startedInquiry = discoveryAgent.startInquiry(DiscoveryAgent.GIAC, listener);
            if (startedInquiry)
            {
                System.out.println("wait for device inquiry to complete...");
                inquiryCompletedEvent.wait();
                System.out.println(devicesDiscovered.size() +  " device(s) found");
            }
        }
        catch ( BluetoothStateException e)
        {
            System.out.println("BluetoothStateException exception: " + e);
        }
        catch (InterruptedException e)
        {
            System.out.println("InterruptedException exception: " + e);
        }
    }        
}

public static void main(String[] args)
{

    RemoteDeviceDiscovery rmd = new RemoteDeviceDiscovery();
}

class MyDiscoveryListener implements DiscoveryListener
{
    public MyDiscoveryListener()
    {
    }

    public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) {
        System.out.println("Device " + btDevice.getBluetoothAddress() + " found");
        devicesDiscovered.add(btDevice);
        try {
            System.out.println("     name " + btDevice.getFriendlyName(false));
        } catch (IOException cantGetDeviceName) {
        }
    }

    public void inquiryCompleted(int discType) {
        System.out.println("Device Inquiry completed!");
        synchronized(inquiryCompletedEvent){
            inquiryCompletedEvent.notifyAll();
        }
    }

    public void serviceSearchCompleted(int transID, int respCode) {
    }

    public void servicesDiscovered(int transID, ServiceRecord[] servRecord) {
    }    
} // class MyDiscoveryListener

} //类RemoteDeviceDiscovery

发现如果我以超级用户权限运行jar,则可以按预期工作:

pi @ raspberrypi〜sudo / java / bluetooth_jar $ / usr / lib / jvm / jdk-8-oracle-arm-vfp-hflt / jre / bin / java -jar bluetooth_jar.jar

输出:

bluez上的BlueCove版本2.1.1-SNAPSHOT等待设备查询完成...设备C4850852975B发现名称GMSEED-PC设备查询已完成! 找到1个设备BlueCove堆栈关闭已完成

如果我以超级用户身份从命令行而不是通过桌面菜单项Menu | Programming | BlueJ启动BlueJ; 即:

pi @ raspberrypi〜$须藤bluej

然后示例应用程序将提供相同的输出。

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