Android BLE onCharacteristicChanged（）未调用

我正在开发一个包含Bluegiga BLE113模块和Android应用程序的项目。在Bluegiga模块上，我设置了几个特性。对于一个特性，我定义了一个描述符来激活clie（在我的情况下，客户端是Android应用程序）。在BLE113模块的特征定义是这样的：Android BLE onCharacteristicChanged（）未调用

<characteristic uuid="dcfa2671-974d-4e4a-96cd-6221afeabb62"  id="ez1_flow_data_out"> 
    <!-- org.bluetooth.descriptor.gatt.characteristic_user_description --> 
    <description>Data to transmit to Android device</description> 
    <properties write="true" read="true" /> 
    <value variable_length="true" length="255" type="hex" /> 
    <!-- org.bluetooth.descriptor.gatt.client_characteristic_configuration --> 
    <descriptor uuid="2902"> 
    <properties write="true" read="true" const="false" /> 
    <!-- Bit 0 = 1: Notifications enabled --> 
    <value type="hex">0001</value> 
    </descriptor> 


    </characteristic>

在Android方面，我根据Android的蓝牙低能量引导建立onServicesDiscovered（...）回调内部通知：

characteristic=gatt.getService(BLEuuids.DATAFLOW_SERVICE).getCharacteristic(BLEuuids.DATAFLOW_OUT_CHARACT); 
//Enable local notifications 
gatt.setCharacteristicNotification(characteristic, true); 
//Enabled remote notifications 
BluetoothGattDescriptor desc = characteristic.getDescriptor(BLEuuids.DATAFLOW_OUT_DESCRIPT); 
boolean test; 
test = desc.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE); // return value = true 
test = gatt.readDescriptor(desc); // return value = true 
test = gatt.writeDescriptor(desc); // return value = true

但是，如果我使用Bluegiga模块的串行接口更改DATAFLOW_OUT_CHARACT特性UUID的值，则在我的Android应用程序上不会触发onCharacteristicChanged（...）的预期回调。

我是否正确设置了描述符，还是在我的Android代码中失败？

来源

2016-06-09 Seasia Creative Crew

现在使通知回调onCharactersticsChanged（）和设置属性ENABLE_NOTIFICATION_VALUE和ENABLE_INDICATION_VALUE

Log.d(TAG, "setCharacteristicNotification"); 
     if (mBluetoothAdapter == null || customBluetoothGatt == null) { 
      Log.d(TAG, "BluetoothAdapter not initialized"); 
      return; 
     }cx 
     customBluetoothGatt.setCharacteristicNotification(characteristic, enabled); 

     BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG)); 
     descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE); 
     descriptor.setValue(BluetoothGattDescriptor.ENABLE_INDICATION_VALUE); 
     boolean success = customBluetoothGatt.writeDescriptor(descriptor);

来源

2016-06-09 05:35:49

Android BLE onCharacteristicChanged（）未调用

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