Interaction with sensors
Programming of sensors on mobile devices -Google Android

The listener object (observer) must implement the SensorEventListener interface, which has two functions.

• The abstract void onAccuracyChanged(Sensor sensor, int accuracy) function is called when sensor accuracy has changed. This function provides an estimate of the measurement accuracy. Possible values are given in table 8.

  A measurement with SensorManager.SENSOR_STATUS_UNRELIABLE status must not be used. This value is unreliable.

  Recalibrating the sensor can often improve measurement quality.

• The abstract void onSensorChanged(SensorEvent event) function is called when the quantity measured by the sensor has changed. This function is the most useful. The object passed as a parameter (SensorEvent event) includes a certain amount of information, such as sensor type, timestamp, accuracy and measured...