3

我在连接时遇到问题。起初它有效,而不是它不,除非我取消配对设备。我已经得到了所有可能发生的异常,套接字关闭、管道关闭、连接被拒绝、端口已在使用等。

我知道 android pre 4.2 ( https://code.google.com/p/android/issues/detail?id=37725 ) 上的蓝牙存在问题。

我在连接这些设备时遇到问题的设备:

  • HTC一(安卓4.2)
  • 三星galaxy s2(android 4.1.2)
  • 关系 4 (4.3)
  • 三星银河 s4 (4.2)

另一个小问题是,配对的设备没有存储(主要在 nexus 4 和 sgs2 上)。

这是我的代码:

private static final UUID MY_UUID_SECURE = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //this is the other one that I've tried: fa87c0d0-afac-11de-8a39-0800200c9a66");

private static final String NAME = "BluetoothConnector";

public void listenForConnection() throws IOException, BluetoothException {
//first close the socket if it is open
closeSocket();

BluetoothServerSocket mServerSocket = null;
try {
    mServerSocket = mBluetoothAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID_SECURE); //ioexception here!         
} catch (IOException e) {
    if (Build.VERSION.SDK_INT >= 9) {
        try { //this is a stupid hack, http://stackoverflow.com/questions/6480480/rfcomm-connection-between-two-android-devices
            Method m = mBluetoothAdapter.getClass().getMethod("listenUsingRfcommOn", new Class[] { int.class });
            mServerSocket = (BluetoothServerSocket) m.invoke(mBluetoothAdapter, PORT);
        } catch (Exception ex) {
            Log.e(ex);
            throw e;
        }
    } else {
        throw e;
    }
}

while (!isCancelled) {
    try {
        socket = mServerSocket.accept();
    } catch (IOException e) {
        if (socket != null) {
            try {
                socket.close();
            } finally {
                socket = null;
            }
        }
        throw e;
    }

    if (socket == null) {
        throw new BluetoothException("Socket connection connected, but null");
    } else {
        isConnected = true;
        break; // everything is ok
    }
}
}



public void connect(String address) throws IOException, BluetoothException {
mBluetoothAdapter.cancelDiscovery();

BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);

try {
    socket = device.createRfcommSocketToServiceRecord(MY_UUID_SECURE);
} catch (IOException e1) {
    Log.e(e1);

    if (Build.VERSION.SDK_INT >= 9) {
        try {
            Method m = device.getClass().getMethod("createRfcommSocket", new Class[] { int.class });
            socket = (BluetoothSocket) m.invoke(device, PORT);
        } catch (Exception e) {
            Log.e(e);
            throw e1;
        }
    } else {
        throw e1;
    }
}

// Make a connection to the BluetoothSocket
try {
    // This is a blocking call and will only return on a
    // successful connection or an exception
    socket.connect();
} catch (IOException e) {
    Log.e(e);
    // Close the socket
    try {
        socket.close();
    } catch (IOException e2) {
        Log.e(e2);
        Log.wtf("unable to close() socket during connection failure");
    }
    throw e;
}

}

private void closeSocket() {
    try {
        if (socket != null) {
            socket.close();
            socket = null;
            Log.d("Socket closed");
        }
    } catch (IOException e) {
        Log.e(e);
        Log.wtf("close() of connect socket failed");
    }
}

我尝试更改 uuid(也是随机的),尝试查看较旧的 sdk 样本。那么这里有什么问题呢?

编辑:试图澄清:问题通常出现,当 2 个已配对、连接、成功通信的设备(由用户)断开连接时。之后,它们将无法重新连接,除非它们重新启动或手动取消配对。

4

2 回答 2

1

您正在尝试以这种方式配对:

private void TwitPairedDevice() {
    buttonTwitPairDevice.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            Set<BluetoothDevice> fetchPairedDevices=bluetooth.getBondedDevices();
            Iterator<BluetoothDevice> iterator=fetchPairedDevices.iterator();
            while(iterator.hasNext())
            {
                final BluetoothDevice pairBthDevice=iterator.next();
                final String addressPairedDevice=pairBthDevice.getAddress();
                AsyncTask<Integer, Void, Void> asynchPairDevice=new AsyncTask<Integer, Void, Void>() {

                    @Override
                    protected Void doInBackground(Integer... params) {
                        try {
                            socket=pairBthDevice.createRfcommSocketToServiceRecord(uuid);
                            socket.connect();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        return null;
                    }

                    }
                };asynchPairDevice.execute();
            }
        }
    });
}

连接 Pired 设备:

    private void FetchPairedDevices() {
        Set<BluetoothDevice> pairedDevices=bluetooth.getBondedDevices();
        for(BluetoothDevice pairedBthDevice:pairedDevices)
        {
            listPairedDevice.add(pairedBthDevice.getName());
        }
        listviewPairedDevice.setAdapter(adapterPairedDevice);
        listviewPairedDevice.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                Object listPairedName=arg0.getItemAtPosition(arg2);
                String selectedPairedName=listPairedName.toString();
                Set<BluetoothDevice> bthDeviceChecking=bluetooth.getBondedDevices();
                for(final BluetoothDevice bthDevice:bthDeviceChecking)
                {
                    if(bthDevice.getName().contains(selectedPairedName))
                    {
                        listPairDevice.clear();
                        listPairDevice.add(bthDevice);
                        final String addressPairedDevice=bthDevice.getAddress();
                        AsyncTask<Integer, Void, Void> asynTask=new AsyncTask<Integer,Void,Void>() {
                            @Override
                            protected Void doInBackground(Integer... params) {
                                try {
                                    socket=bthDevice.createRfcommSocketToServiceRecord(uuid);
                                    socket.connect();
                                } catch (IOException e) {
                                    e.printStackTrace();
                                }
                                return null;
                            }
};
                        asynTask.execute(arg2);
                    }
                }
            }
        });
    }
于 2013-09-05T10:32:58.330 回答
1

似乎此时蓝牙在android上被破坏了。

没有确定的方法可以连接 2 个始终有效的设备。 有些人正在使用非官方的方式来做到这一点,但这并不适用于所有设备。

我对目前市场上排名前 10 位的设备进行了一些内部测试,因此在大约 90 次测试运行之后,被黑的方法在 75% 的时间内有效,这还不够好。

例如,HTC oneX 将只处理传入的蓝牙请求,作为蓝牙免提设备(它正在成功连接!),但无法发送消息。

在实现完整的蓝牙功能后,我们决定将其从我们的应用程序中删除,并在没有它的情况下发布它。我们将在稍后的版本中切换到 wifi。

于 2013-09-05T13:11:59.833 回答