Android - 无需配对即可连接多个蓝牙设备

Question

我有一堆不可发现的设备，但我知道它们的 MAC 地址。目前我可以在我的 ConnectThread 中使用它连接到多个设备：

Method m = device.getClass().getMethod("createRfcommSocket",new Class[] { int.class });

tmp = (BluetoothSocket) m.invoke(device, 1);

问题是我想为 2.3 之前的设备支持不安全的 RFCOMM。然后我 found this 在另一个答案上让我这样做：

tmp = InsecureBluetooth.createRfcommSocketToServiceRecord(device,MY_UUID, true);

无需配对即可完美连接到单个设备。

我的问题是我如何才能两全其美并在 InsecureBluetooth 类上使用反射？或者它是否需要在 InsecureBluetooth 类中完成，如果是这样，怎么做？下面是 InsecureBluetooth 类的相关部分：

private static BluetoothSocket createRfcommSocketToServiceRecord(
        BluetoothDevice device, int port, UUID uuid, boolean encrypt)
        throws IOException {
    try {
        BluetoothSocket socket = null;
        Constructor<BluetoothSocket> constructor = BluetoothSocket.class
                .getDeclaredConstructor(int.class, int.class, boolean.class,
                        boolean.class, BluetoothDevice.class, int.class, ParcelUuid.class);
        if (constructor == null)
            throw new RuntimeException("can't find the constructor for socket");

        constructor.setAccessible(true);
        Field f_rfcomm_type = BluetoothSocket.class
                .getDeclaredField("TYPE_RFCOMM");
        f_rfcomm_type.setAccessible(true);
        int rfcomm_type = (Integer) f_rfcomm_type.get(null);
        socket = constructor.newInstance(new Object[] { rfcomm_type, -1, false,
                true, device, port, uuid != null ? new ParcelUuid(uuid) : null });
        return socket;
    } catch (NoSuchMethodException e) {
        throw new RuntimeException(e);
    } catch (NoSuchFieldException e) {
        throw new RuntimeException(e);
    } catch (IllegalAccessException e) {
        throw new RuntimeException(e);
    } catch (InstantiationException e) {
        throw new RuntimeException(e);
    } catch (InvocationTargetException e) {
        if (e.getCause() instanceof IOException) {
            throw (IOException) e.getCause();
        }
        throw new RuntimeException(e.getCause());
    }
}

public static BluetoothSocket createRfcommSocketToServiceRecord(
        BluetoothDevice device, UUID uuid, boolean encrypt) throws IOException {
    return createRfcommSocketToServiceRecord(device, -1, uuid, encrypt);
}

public static BluetoothSocket createRfcommSocket(BluetoothDevice device,
        int port, boolean encrypt) throws IOException {
    return createRfcommSocketToServiceRecord(device, port, null, encrypt);
}

Answer 1

您可以使用以下类来创建不安全的蓝牙套接字连接。它会自动处理反射以便为低于 2.3.3 的 SDK 提供此功能

import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.UUID;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.os.Binder;
import android.os.Handler;
import android.os.IBinder;
import android.os.ParcelUuid;
import android.util.Log;

/**
 * Class to offer unsecure bluetooth socket connection.<br />
 * It was intended to be used when building the app with API version below 10 (API < Android2.3.3)
 * @author waa
 *
 */
@SuppressWarnings("all")
public class UnpairedBluetooth {
    static private class InUse extends RuntimeException {
    }

    public static BluetoothServerSocket listenUsingRfcommWithServiceRecord(BluetoothAdapter adapter, String name, UUID uuid, boolean encrypt) throws IOException {
        try {
            Class c_rfcomm_channel_picker = null;
            Class[] children = BluetoothAdapter.class.getDeclaredClasses();
            for(Class c : children) {
                Log.e("TO", "class " + c.getCanonicalName());
                if(c.getCanonicalName().equals(BluetoothAdapter.class.getName() + ".RfcommChannelPicker")) {
                    c_rfcomm_channel_picker = c;
                    break;
                }
            }
            if(c_rfcomm_channel_picker == null)
                throw new RuntimeException("can't find the rfcomm channel picker class");

            Constructor constructor = c_rfcomm_channel_picker.getDeclaredConstructor(UUID.class);
            if(constructor == null)
                throw new RuntimeException("can't find the constructor for rfcomm channel picker");
            Object rfcomm_channel_picker = constructor.newInstance(new Object[] {uuid});
            Method m_next_channel = c_rfcomm_channel_picker.getDeclaredMethod("nextChannel", new Class[] {});
            m_next_channel.setAccessible(true);

            BluetoothServerSocket socket = null;

            int channel;
            int errno;
            while (true) {
                channel = (Integer)m_next_channel.invoke(rfcomm_channel_picker, new Object[] {});

                if (channel == -1) {
                    throw new IOException("No available channels");
                }

                try {
                    socket = listenUsingRfcomm(channel, encrypt);
                    break;
                } catch(InUse e) {
                    continue;
                }
            }

            Field f_internal_service = adapter.getClass().getDeclaredField("mService");
            f_internal_service.setAccessible(true);
            Object internal_service = f_internal_service.get(adapter);

            Method m_add_rfcomm_service_record = internal_service.getClass().getDeclaredMethod("addRfcommServiceRecord", new Class[] {String.class, ParcelUuid.class, int.class, IBinder.class});
            m_add_rfcomm_service_record.setAccessible(true);

            int handle = (Integer)m_add_rfcomm_service_record.invoke(internal_service, new Object[] { name, new ParcelUuid(uuid), channel, new Binder() } );

            if (handle == -1) {
                try {
                    socket.close();
                } catch (IOException e) {}
                throw new IOException("Not able to register SDP record for " + name);
            }
            Field f_internal_handler = adapter.getClass().getDeclaredField("mHandler");
            f_internal_handler.setAccessible(true);
            Object internal_handler = f_internal_handler.get(adapter);

            Method m_set_close_handler = socket.getClass().getDeclaredMethod("setCloseHandler", new Class[] {Handler.class, int.class});
            m_set_close_handler.setAccessible(true);

            m_set_close_handler.invoke(socket, new Object[] { internal_handler, handle});
            return socket;
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        } catch (NoSuchFieldException e) {
            throw new RuntimeException(e);
        } catch(IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch(InstantiationException e) {
            throw new RuntimeException(e);
        } catch(InvocationTargetException e) {
            if(e.getCause() instanceof IOException) {
                throw (IOException)e.getCause();
            }
            throw new RuntimeException(e.getCause());
        }   
    }
    private static BluetoothServerSocket listenUsingRfcomm(/*BluetoothAdapter adapter, */ int port, boolean encrypt, boolean reuse) throws IOException, InUse {
        BluetoothServerSocket socket = null;
        try {
            Constructor<BluetoothServerSocket> constructor = BluetoothServerSocket.class.getDeclaredConstructor(int.class, boolean.class, boolean.class, int.class);
            if(constructor == null)
                throw new RuntimeException("can't find the constructor");
            constructor.setAccessible(true);
            Field f_rfcomm_type = BluetoothSocket.class.getDeclaredField("TYPE_RFCOMM");
            f_rfcomm_type.setAccessible(true);
            int rfcomm_type = (Integer)f_rfcomm_type.get(null);

            Field f_e_addr_in_use = BluetoothSocket.class.getDeclaredField("EADDRINUSE");
            f_e_addr_in_use.setAccessible(true);
            int e_addr_in_use = (Integer)f_e_addr_in_use.get(null);

            socket = constructor.newInstance(new Object[] { rfcomm_type, false, encrypt, port } );

            Field f_internal_socket = socket.getClass().getDeclaredField("mSocket");
            f_internal_socket.setAccessible(true);
            Object internal_socket = f_internal_socket.get(socket);
            Method m_bind_listen = internal_socket.getClass().getDeclaredMethod("bindListen", new Class[] {});
            m_bind_listen.setAccessible(true);
            Object result = m_bind_listen.invoke(internal_socket, new Object[] {});

            int errno = (Integer)result;
            if(reuse && errno == e_addr_in_use) {
                throw new InUse();
            } else if (errno != 0) {
                try {
                    socket.close();
                } catch (IOException e) {}
                internal_socket.getClass().getMethod("throwErrnoNative", new Class[] {int.class}).invoke(internal_socket, new Object[] { errno });
            }
            return socket;
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        } catch (NoSuchFieldException e) {
            throw new RuntimeException(e);
        } catch(IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch(InstantiationException e) {
            throw new RuntimeException(e);
        } catch(InvocationTargetException e) {
            if(e.getCause() instanceof IOException) {
                throw (IOException)e.getCause();
            }
            throw new RuntimeException(e.getCause());
        }
    }
    public static BluetoothServerSocket listenUsingRfcomm(int port, boolean encrypt) throws IOException {
        return listenUsingRfcomm(port, encrypt, false);
    }
    private static BluetoothSocket createRfcommSocketToServiceRecord(BluetoothDevice device, int port, UUID uuid, boolean encrypt) throws IOException {
        try {
            BluetoothSocket socket = null;
            Constructor<BluetoothSocket> constructor = BluetoothSocket.class.getDeclaredConstructor(
                    int.class, int.class, boolean.class, boolean.class, BluetoothDevice.class, int.class, ParcelUuid.class);
            if(constructor == null)
                throw new RuntimeException("can't find the constructor for socket");

            constructor.setAccessible(true);
            Field f_rfcomm_type = BluetoothSocket.class.getDeclaredField("TYPE_RFCOMM");
            f_rfcomm_type.setAccessible(true);
            int rfcomm_type = (Integer)f_rfcomm_type.get(null);
//          socket = constructor.newInstance(new Object[] { rfcomm_type, -1, false, true, device, port, uuid != null ? new ParcelUuid(uuid) : null} );
            socket = constructor.newInstance(new Object[] { rfcomm_type, -1, false, encrypt, device, port, uuid != null ? new ParcelUuid(uuid) : null} );
            return socket;
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        } catch (NoSuchFieldException e) {
            throw new RuntimeException(e);
        } catch(IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch(InstantiationException e) {
            throw new RuntimeException(e);
        } catch(InvocationTargetException e) {
            if(e.getCause() instanceof IOException) {
                throw (IOException)e.getCause();
            }
            throw new RuntimeException(e.getCause());
        }
    }
    public static BluetoothSocket createRfcommSocketToServiceRecord(BluetoothDevice device, UUID uuid, boolean encrypt) throws IOException{
        return createRfcommSocketToServiceRecord(device, -1, uuid, encrypt);
    }
    public static BluetoothSocket createRfcommSocket(BluetoothDevice device, int port, boolean encrypt) throws IOException {
        return createRfcommSocketToServiceRecord(device, port, null, encrypt);
    }
}

更多信息，请参考this链接。