每个人都过得愉快!所以我有这个Android应用程序作为客户端,并尝试连接到我的PC上的一个Java应用程序,其中有一个蓝牙服务器组件。
我面临的问题是只有在我的Nexus 5 的配对设备列表中没有我的电脑时才建立连接。换句话说,它们仅在配对时才连接。因此,每次我想要连接或连接失败时,我都被迫从配对设备列表中删除我的电脑。
我已将此Simple Android and Java Bluetooth Application用作服务器端应用程序的基础:
import java.io.IOException;
import javax.bluetooth.BluetoothStateException;
import javax.bluetooth.DiscoveryAgent;
import javax.bluetooth.LocalDevice;
import javax.bluetooth.UUID;
import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;
import javax.microedition.io.StreamConnectionNotifier;
public class WaitThread implements Runnable{
public WaitThread() { }
@Override
public void run() {
waitForConnection();
}
/** Waiting for connection from devices */
private void waitForConnection() {
// retrieve the local Bluetooth device object
LocalDevice local = null;
StreamConnectionNotifier notifier;
StreamConnection connection = null;
// setup the server to listen for connection
try {
local = LocalDevice.getLocalDevice();
local.setDiscoverable(DiscoveryAgent.GIAC);
UUID uuid = new UUID("04c6032b00004000800000805f9b34fc", false);
System.out.println(uuid.toString());
String url = "btspp://localhost:" + uuid.toString() + ";name=RemoteBluetooth";
notifier = (StreamConnectionNotifier) Connector.open(url);
} catch (BluetoothStateException e) {
System.out.println("Bluetooth is not turned on.");
e.printStackTrace();
return;
} catch (IOException e) {
e.printStackTrace();
return;
}
// waiting for connection
while(true) {
try {
System.out.println("waiting for connection...");
connection = notifier.acceptAndOpen();
Thread processThread = new Thread(new ProcessConnectionThread(connection));
processThread.start();
} catch (Exception e) {
e.printStackTrace();
return;
}
}
}
}
并使用来自android示例项目的BluetoothChat作为客户端的基础:
import java.io.IOException;
import java.util.UUID;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
public class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
Handler mHandler;
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
private static final UUID MY_UUID = UUID
.fromString("04c6032b-0000-4000-8000-00805f9b34fc");
public ConnectThread(BluetoothDevice device, Handler handler) {
// Use a temporary object that is later assigned to mmSocket,
// because mmSocket is final
BluetoothSocket tmpSocket = null;
mmDevice = device;
mHandler = handler;
// Get a BluetoothSocket to connect with the given BluetoothDevice
try {
tmpSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Message msgException = new Message();
msgException.setTarget(mHandler);
msgException.what = Constants.DISCONNECTED_HANDLER;
msgException.sendToTarget();
}
mmSocket = tmpSocket;
}
public void run() {
// Cancel discovery because it will slow down the connection
mBluetoothAdapter.cancelDiscovery();
Message msg1 = new Message(); // handler. we use it to know when de
// device has been connected or
// disconnected in the UI activity
msg1.setTarget(mHandler);
msg1.what = Constants.CONNECTING_HANDLER;
msg1.sendToTarget();
try {
// Connect the device through the socket. This will block
// until it succeeds or throws an exception
mmSocket.connect();
// handler
Message msg2 = new Message();
msg2.setTarget(mHandler);
msg2.what = Constants.CONNECTED_HANDLER;
msg2.setTarget(mHandler);
msg2.sendToTarget();
} catch (IOException connectException) {
// Unable to connect; close the socket and get out
System.out.println("alex - NO connected");
Message msgException = new Message();
msgException.setTarget(mHandler);
msgException.what = Constants.DISCONNECTED_HANDLER;
msgException.sendToTarget();
try {
mmSocket.close();
} catch (IOException closeException) {
}
return;
}
}
/** Will cancel an in-progress connection, and close the socket */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
}
}
public BluetoothSocket getBTSocket() {
return mmSocket;
}
}
我觉得这可能是因为我正在使用的UUID。对我有用的UUID如下:
我在两个应用程序中都使用类似的UUID。什么可能导致这个问题的想法?
答案 0 :(得分:0)
奇怪的是,今天当我使用蓝牙适配器而不是我自己的笔记本电脑的蓝牙时,问题得到了解决。因此,这不是代表软件组件的问题。