harmony 鸿蒙Sensor Usage Guidelines

  • 2022-08-09
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Sensor Usage Guidelines

The following steps use the sensor whose sensorTypeId is 0 as an example. The guidelines for other sensor types are similar.

How to Use

  1. Import the required header files.

    #include "sensor_agent.h"
    #include "sensor_agent_type.h"
    
  2. Create a sensor callback.

    void SensorDataCallbackImpl(SensorEvent *event)
    {
        if(event == NULL){
            return;
        }
        float *sensorData=(float *)event->data;
    }
    

    icon-note.gif NOTE The callback must be of the RecordSensorCallback type.

  3. Obtain the list of sensors supported by the device.

    SensorInfo *sensorInfo = (SensorInfo *)NULL;
    int32_t count = 0;
    int32_t ret = GetAllSensors(&sensorInfo, &count);
    
  4. Create a sensor user.

    SensorUser sensorUser;
    sensorUser.callback = SensorDataCallbackImpl; // Assign the created callback SensorDataCallbackImpl to the member variable callback.
    
  5. Enable the sensor.

    int32_t ret = ActivateSensor(0, &sensorUser);
    
  6. Subscribe to sensor data.

    int32_t ret = SubscribeSensor(0, &sensorUser);
    

    icon-note.gif NOTE Till now, you can obtain the sensor data via the callback.

  7. Unsubscribe from the sensor data.

    int32_t ret = UnsubscribeSensor(0, &sensorUser);
    
  8. Disable the sensor.

    int32_t ret = DeactivateSensor(0, &sensorUser);
    

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