Android BLE BluetoothGattDescriptor writeDescriptor 问题

Question

我正在构建一个与 BLE 通信的应用程序。我需要向 BluetoothGattDescriptor 写入一个 int 值。如果我在一切正常时这样做，但如果我想为每个写入 BluetoothGattDescriptor(在单独的特征中)，我会在方法 mBluetoothGatt.writeDescriptor(descriptor) 中收到一个 false 值 但仅针对第二个特征，我第一次得到 true。我注意到，如果我将它们之间的延迟设置为大约 1.3 秒，那么我在两次尝试中都会收到 true。有人遇到同样的问题吗？

这里我发送延迟通知的注册:

            Handler handler = new Handler();

    registeredToNotification(BLEGattAttributes.UUID_STERN_DATA__REMOTE_CONTROLS_SETTINGS_SERVICE,
            BLEGattAttributes.UUID_STERN_DATA_SETTINGS_REMOTES_CONTROL_READ_REQUEST_DELAY_IN, SettingsProperties.DELAY_IN_REGISTER_NOTIFICATION_REQUEST);

    handler.postDelayed(() -> registeredToNotification(BLEGattAttributes.UUID_STERN_DATA__REMOTE_CONTROLS_SETTINGS_SERVICE,
            BLEGattAttributes.UUID_STERN_DATA_SETTINGS_REMOTES_CONTROL_READ_REQUEST_DELAY_OUT, SettingsProperties.DELAY_OUT_REGISTER_NOTIFICATION_REQUEST), 1300);


    handler.postDelayed(() -> registeredToNotification(BLEGattAttributes.UUID_STERN_DATA__REMOTE_CONTROLS_SETTINGS_SERVICE,
            BLEGattAttributes.UUID_STERN_DATA_SETTINGS_REMOTES_CONTROL_READ_REQUEST_SHORT_WASH, SettingsProperties.SHORT_FLUSH_REGISTER_NOTIFICATION_REQUEST), 2600);


    handler.postDelayed(() -> registeredToNotification(BLEGattAttributes.UUID_STERN_DATA__REMOTE_CONTROLS_SETTINGS_SERVICE,
            BLEGattAttributes.UUID_STERN_DATA_SETTINGS_REMOTES_CONTROL_READ_REQUEST_LONG_WASH, SettingsProperties.LONG_FLUSH_REGISTER_NOTIFICATION_REQUEST), 3900);


    handler.postDelayed(() -> registeredToNotification(BLEGattAttributes.UUID_STERN_DATA__REMOTE_CONTROLS_SETTINGS_SERVICE,
            BLEGattAttributes.UUID_STERN_DATA_SETTINGS_REMOTES_CONTROL_READ_REQUEST_SECURITY_TIME, SettingsProperties.SECURITY_TIME_REGISTER_NOTIFICATION_REQUEST), 5200);

这是这些命令的日志:

 D/IDTEST: ............................setRegisterToNotification
 D/IDTEST: ......setRegisterToNotification ID = 53
 D/IDTEST: ............................Is descriptor registered? = true
 D/IDTEST: ............................Is Notification registered? = true
 D/IDTEST: ............................setRegisterToNotification
 D/IDTEST: ......setRegisterToNotification ID = 56
 D/IDTEST: ............................Is descriptor registered? = true
 D/IDTEST: ............................Is Notification registered? = true
 D/IDTEST: ............................setRegisterToNotification
 D/IDTEST: ......setRegisterToNotification ID = 63
 D/IDTEST: ............................Is descriptor registered? = true
 D/IDTEST: ............................Is Notification registered? = true
 D/IDTEST: ............................setRegisterToNotification
 D/IDTEST: ......setRegisterToNotification ID = 60
 D/IDTEST: ............................Is descriptor registered? = true
 D/IDTEST: ............................Is Notification registered? = true
 D/IDTEST: ............................setRegisterToNotification
 D/IDTEST: ......setRegisterToNotification ID = 66
 D/IDTEST: ............................Is descriptor registered? = true
 D/IDTEST: ............................Is Notification registered? = true

setRegisterToNotification() 方法:

public void setRegisterToNotification(BLEDeviceConnectionManager.DataClass dataClass) {

        Log.d("IDTEST", "............................setRegisterToNotification");
        Log.d("IDTEST", "......setRegisterToNotification ID = " + dataClass.getRequestID());


        BluetoothGattCharacteristic characteristic = mBluetoothGatt.getService(dataClass.getServiceUUid()).getCharacteristic(dataClass.getCharacteristicsUUid());

        BluetoothGattDescriptor descriptor = characteristic.getDescriptors().get(0);

        if (descriptor != null) {
            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            descriptor.setValue(BleDataParser.getInstance().intTobyteArray(dataClass.getRequestID()));
            boolean isRegistered = mBluetoothGatt.writeDescriptor(descriptor);

            Log.d("IDTEST", "............................Is descriptor registered? = " + isRegistered);

        }

        boolean isRegistered = mBluetoothGatt.setCharacteristicNotification(characteristic, dataClass.isEnableNotification());

        Log.d("IDTEST", "............................Is Notification registered? = " + isRegistered);


    }

Answer 1

需要等待描述符回调后再写。这是在 BluetoothGattCallback#onDescriptorWrite 中找到的当您调用 connectGatt 时使用.