蓝牙

    //第一次连接需要输入密码,这个是弹起弹窗的方式
private void requestConnectWindow(BluetoothDevice remoteDevice) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
    if (!mBTadapter.isEnabled()){//本地蓝牙设备是否开启没开启则开启
        mBTadapter.enable();
    }
    if (mBTadapter.isDiscovering()){//本地蓝牙设备是否正在扫描,正在扫描则停止扫描
        mBTadapter.cancelDiscovery();
    }

    Boolean returnValue = false;
    //利用反射方法调用BluetoothDevice.createBond(BluetoothDevice remoteDevice);
        Method createBondMethod = BluetoothDevice.class.getMethod("createBond");
    returnValue = (Boolean) createBondMethod.invoke(remoteDevice);
    Log.i(TAG, "第一次连接蓝牙请求弹窗:"+remoteDevice.getName());
}
//自动连接已经保存的设备
private void connectAlreadySaveDevice(BluetoothDevice remoteDevice) {
    if (!mBTadapter.isEnabled()){//本地蓝牙设备是否开启没开启则开启
        mBTadapter.enable();
    }
    if (mBTadapter.isDiscovering()){//本地蓝牙设备是否正在扫描,正在扫描则停止扫描
        mBTadapter.cancelDiscovery();
    }
    final String SPP_UUID = "00001101-0000-1000-8000-00805F9B34FB";//UUid唯一标示符,可以生成,也可以写死,这里就先写死了
    UUID uuid = UUID.fromString(SPP_UUID);
    try {
        BluetoothSocket btSocket = remoteDevice.createRfcommSocketToServiceRecord(uuid);
        btSocket.connect();
        Log.i(TAG, "已经连接蓝牙设备:"+remoteDevice.getName());
    } catch (IOException e) {
        e.printStackTrace();
    }
}

    //取消蓝牙配对
    private void unpairDevice(BluetoothDevice device) {
        try {
            Method m = device.getClass().getMethod("removeBond", (Class[]) null);
            m.invoke(device, (Object[]) null);
        } catch (Exception e) {
            Log.e(TAG, e.getMessage());
        }
    }
//反射设置弹窗的配对码
    public void setBluetoothPairingPin(BluetoothDevice device) {
        String string = "1234";
        byte[] pinBytes = string.getBytes();
        try {
            //Log.d(TAG, "Try to set the PIN");
            Method m = device.getClass().getMethod("setPin", byte[].class);
            m.invoke(device, pinBytes);
            Log.d(TAG, "Success to add the PIN.");
            try {
                device.getClass().getMethod("setPairingConfirmation", boolean.class).invoke(device, true);
                Log.d(TAG, "Success to setPairingConfirmation.");
            } catch (Exception e) {
                // TODO Auto-generated catch block
                //       Log.e(TAG, e.getMessage());
                e.printStackTrace();
            }
        } catch (Exception e) {
            //  Log.e(TAG, e.getMessage());
            e.printStackTrace();
        }
    }