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android - Android BLE BluetoothGattDescriptor writeDescriptor 问题

问题描述

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执行此操作，但是如果我想为每个人写入 BluetoothGattDescriptor（在单独的特征中），我会在方法中收到一个错误值，mBluetoothGatt.writeDescriptor(descriptor)但仅针对第二个特征，这是我第一次得到真实. 我注意到，如果我在它们之间设置大约 1.3 秒的延迟，那么我在两次尝试中都会收到 true。有人面临同样的问题吗？

在这里，我延迟发送通知的注册：

            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);

以下是这些命令的日志：

 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);


    }

标签： androidbluetooth-lowenergy

解决方案

在再次写入之前，您需要等待描述符回调。这可以在调用connectGatt时使用的BluetoothGattCallback#onDescriptorWrite中找到。

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