Android蓝牙重新连接失败

Question

我正在连接HC05蓝牙模块并与arduino通讯，效果很好。

但是我遇到了一个问题。

有时，断开连接后无法再次连接到蓝牙模块，除非重新启动HC05。

我正在考虑，也许与我如何进行连接和断开连接有关。我正在使用不同的活动来连接和断开与蓝牙模块的连接。

我称其为开始蓝牙连接：

try {
            findBT();
            openBT();
        } catch (IOException e) {
            Log.e("Bluetooth", "Couldn't find or connect to bluetooth");
        }

这是我找到特定蓝牙模块的代码：

void findBT() {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
    Toast errore = makeText(Menu2.this, "Error, enable bluetooth", Toast.LENGTH_LONG);
    errore.show();
}
if (!mBluetoothAdapter.isEnabled()) {
    Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(enableBluetooth, 0);
}
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter
        .getBondedDevices();
if (pairedDevices.isEmpty()) {
    Log.e("bluetooth",
            "No devices paired...");
    return ;
}
String MY_MAC_ADDR = getResources().getString(R.string.Machine_Bluetooth_MAC);

for (BluetoothDevice device : pairedDevices) {
    Log.d("Bluetooth", "Device : address : " + device.getAddress() + " name :"
            + device.getName());
    if (MY_MAC_ADDR.equals(device.getAddress())) {
        mmDevice = device;
        break;
    }
}
Log.e("Bluetooth", "Bluetooth device found01");
//Toast found = makeText(MachineReady.this, "Bluetooth device found", Toast.LENGTH_LONG);
//found.show();
}

连接到蓝牙：

void openBT() throws IOException {
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
Log.e("Bluetooth", "Almost connected");
mBluetoothAdapter.cancelDiscovery();
mmSocket.connect();
Log.e("Bluetooth", "Connected");
mmOutputStream = mmSocket.getOutputStream();
mmInputStream = mmSocket.getInputStream();
if(mmSocket.isConnected()){
    bluConnection = true;
    beginListenForData();

    Log.e("Bluetooth", "Bluetooth connection has been established4");
    try {
        String msg = "512\n";
        mmOutputStream.write(msg.getBytes());

    } catch (IOException e) {
        Log.e("Send bluetooth", "Couldn't send text");
    }

}else if(!mmSocket.isConnected()){

    Log.e("Bluetooth", "Bluetooth couldn't connect to the device");
}
}

收听从蓝牙接收的数据：

void beginListenForData()
{
    final Handler handler = new Handler();
final byte delimiter = 10; //This is the ASCII code for a newline character

stopWorker = false;
readBufferPosition = 0;
readBuffer = new byte[1024];
workerThread = new Thread(new Runnable()
{
    public void run()
    {
        while(!Thread.currentThread().isInterrupted() && !stopWorker)
        {
            try
            {
                int bytesAvailable = mmInputStream.available();
                if(bytesAvailable > 0)
                {
                    byte[] packetBytes = new byte[bytesAvailable];
                    mmInputStream.read(packetBytes);
                    for(int i=0;i<bytesAvailable;i++)
                    {
                        byte b = packetBytes[i];
                        if(b == delimiter)
                        {
                            byte[] encodedBytes = new byte[readBufferPosition];
                            System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
                            final String data = new String(encodedBytes, "US-ASCII");

                            readBufferPosition = 0;

                            handler.post(new Runnable()
                            {
                                public void run()
                                {
                                    Log.e("Bluetooth", "Bluetooth data received is " + data);

                                    if(data.contains("z")){
                                        sendokcommand();
                                        try {
                                            closeBT();
                                        } catch (IOException e) {
                                            Log.e("Close bluetooth", "Couldn't close the bluetooth connection13");
                                            e.printStackTrace();
                                        }

                                        busyMachineString = data;
                                        MachinesAdapter.setString(busyMachineString);
                                    }
                                }
                            });
                        }
                        else
                        {
                            readBuffer[readBufferPosition++] = b;
                        }
                    }
                }
            }
            catch (IOException ex)
            {
                stopWorker = true;
            }
        }
    }
});
workerThread.start();
}

当我收到命令时，我会发送一个OK命令以确认我已收到正确的消息：

public void sendokcommand(){
    if(bluConnection) {
        try {
            String msg = "0\n";
            mmOutputStream.write(msg.getBytes());
            //Toast b = Toast.makeText(this, msg, Toast.LENGTH_LONG);
            //b.show();
        } catch (IOException e) {
            Log.e("Send bluetooth", "Couldn't send text");
        }
    }

    } 

我每次离开活动时都会使用CloseBT：

void closeBT() throws IOException
{
stopWorker = true;
mmOutputStream.close();
mmInputStream.close();
mmSocket.close();
}

连接和断开连接方法看起来是否正确，还是需要以其他方式执行此操作？当它失败时，我在日志中收到此错误，“找不到或连接到蓝牙”，这是我的第一个代码段。

很抱歉，对于这个冗长的示例，我只是认为展示如何处理不同的蓝牙场景非常重要。希望您能并且会帮助我。