重新连接

Question

我正在将打印数据写入Zebra ZD410打印机的BluetoothGattCharacteristic。我通过将数据分块为20个字节的块并使用以下代码一次写入一个块来实现此目的：

mCharacteristic.setValue(bytes);
boolean status = mGatt.writeCharacteristic(mCharacteristic);

然后等到我开始写下一个块之前收到BluetoothGattCallback.onCharacteristicWrite()。这很好用。

如果我disconnect()和close() BluetoothGatt以后再次使用BluetoothDevice.connectGatt()连接到同一设备，然后尝试在Characteristic之后写{ {1}}已被调用，我再次拥有onServicesDiscovered()，写入将失败。我的意思是，当我现在写Characteristic时，Characteristic会被onCharacteristicWrite()调用，Characteristic会getValue()返回最后一个值写在老加特身上。

在尝试解决这两天并阅读大量SO帖后，我还没有找到解决方案。

我该如何解决这个问题？

修改 以下是BluetoothGattCallback

的代码

private final BluetoothGattCallback gattCallback = new BluetoothGattCallback()
{
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState)
    {
        FALog.i(TAG, "onConnectionStateChange Status: " + status);
        switch (newState)
        {
            case BluetoothProfile.STATE_CONNECTED:
                FALog.i(TAG, "gattCallback STATE_CONNECTED");
                gatt.discoverServices();
                break;
            case BluetoothProfile.STATE_DISCONNECTED:
                disconnectAndCloseGatt();
                mCharacteristic = null;
                connectionFailed();
                FALog.e(TAG, "gattCallback STATE_DISCONNECTED");
                break;
            default:
                FALog.e(TAG, "gattCallback STATE_OTHER");
        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status)
    {
        BluetoothGattService service = gatt.getService(PRINTER_SERVICE_UUID);
        if (service != null)
        {
            BluetoothGattCharacteristic characteristic = service.getCharacteristic
                    (PRINTER_SERVICE_CHARACTERISTIC_UUID);
            if (characteristic != null)
            {
                mCharacteristic = characteristic;
                mInternalState = STATE_CONNECTED;
                mState = State.CONNECTED;
                notifyStateChanged();
                print("~JA");
                FALog.d(TAG, "Printer connected");
                mBluetoothActivity.runOnUiThread(new Runnable()
                {
                    @Override
                    public void run()
                    {
                        mListener.onPrinterConnected();
                    }
                });
            }
        }
    }

    @Override
    public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status)
    {
        FALog.d(TAG, "received onCharacteristicWrite " + new String(characteristic.getValue()) + "; success: " +
                (status == BluetoothGatt.GATT_SUCCESS));
        if (status == BluetoothGatt.GATT_SUCCESS)
        {
            handler.removeCallbacks(writeRunnable);
            popQueueAndReleaseLock();
        }
    }
};