Java 蓝牙Gatt回调异常“；注册回调失败"；

每当我试图在我想要接收数据的设备上连接以使用connect gatt时，就会收到一条错误消息，说注册回调失败。我看到了关于这个问题的另一个主题（），这个问题的解决方案应该是使connectgatt或其他与gattcallback相关的函数在UIthread中运行。我也试过了，但还是收到了同样的错误

下面是我如何调用connectGatt方法的

        connectBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Handler handler = new Handler(Looper.getMainLooper());
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        bluetoothDevice.connectGatt(getApplicationContext(),false,Gatt);
                    }
                });

            }
        });

以及我如何实例化gattcallback：

private BluetoothGattCallback Gatt= new BluetoothGattCallback() {
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            super.onConnectionStateChange(gatt, status, newState);
            if (status == GATT_SUCCESS) {
                if (newState == BluetoothProfile.STATE_CONNECTED) {
                    int bondstate = bluetoothDevice.getBondState();

                    if (bondstate == BOND_NONE || bondstate == BOND_BONDED) {
                        Log.d("BLE", String.format(Locale.ENGLISH, "discovering services of '%s' with delay", bluetoothDevice.getName()));
                        boolean result = gatt.discoverServices();
                        if (!result) {
                             Log.i("BLE", "discoverServices failed to start");
                        }
                    } else if (bondstate == BOND_BONDING) {
                        // Bonding process in progress, let it complete
                         Log.i("BLE", "waiting for bonding to complete");
                    } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                        gatt.close();
                    } else {
                        gatt.close();
                    }
                }                                                                                                                                                                                                                                                                                                                                                                                                                        else {
                    gatt.close();
                }
            }
        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            Log.i("BLE", "OnServiceDiscovered");
            super.onServicesDiscovered(gatt, status);
            if (status == BluetoothGatt.GATT_SUCCESS) {
                bluetoothGatt = gatt;
                for (BluetoothGattService gattService : bluetoothGatt.getServices()) {
                    Log.i("BLE", "Service");
                    for (BluetoothGattCharacteristic characteristic : gattService.getCharacteristics()) {
                        Log.i("BLE", "characteristic");
                        for (BluetoothGattDescriptor gattDescriptor: characteristic.getDescriptors()) {
                            Log.i("BLE", "notifs");
                            bluetoothGatt.setCharacteristicNotification(characteristic, true);
                            gattDescriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
                            gatt.writeDescriptor(gattDescriptor);
                        }
                    }
                }
            }
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
            super.onCharacteristicChanged(gatt, characteristic);
            Log.i("BLE", "message reçu"+characteristic.getStringValue(0));
            message.setText(characteristic.getStringValue(0));
        }
    };
}

根据我的调试，一旦程序离开ConnectionStateChange方法，就会出现错误“注册回调失败”。 你能帮我找出为什么我会犯这个错误吗？谢谢你的阅读