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

Import the required header files.

#include "sensor_agent.h"
#include "sensor_agent_type.h"

Create a sensor callback.

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

NOTE The callback must be of the RecordSensorCallback type.

Obtain the list of sensors supported by the device.

SensorInfo *sensorInfo = (SensorInfo *)NULL;
int32_t count = 0;
int32_t ret = GetAllSensors(&sensorInfo, &count);

Create a sensor user.

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

Enable the sensor.

int32_t ret = ActivateSensor(0, &sensorUser);

Subscribe to sensor data.
```
int32_t ret = SubscribeSensor(0, &sensorUser);
```
NOTE Till now, you can obtain the sensor data via the callback.

Unsubscribe from the sensor data.

int32_t ret = UnsubscribeSensor(0, &sensorUser);

Disable the sensor.

int32_t ret = DeactivateSensor(0, &sensorUser);

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harmony 鸿蒙Sensor Usage Guidelines

Sensor Usage Guidelines

How to Use

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