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Using the sensors requires access, interpretation and processing. In this tutorial you will see how the standard monitoring of values is returned of sensor. The way to do this is to implementing the class SensorEventListenter and the overriding methods onSensorChange to monitor the sensor values andOnAccuracyChange, to react at changes for accuracy.
The SensorEvent object given as parameter for OnSensorChange function includes the following features:
• sensor – the sensor object that triggered the action.
• accurancy – the accuracy object of Sensor type when the event was triggered.
• values – an array of data type float that contains the new detected values.
• timestamp – the time(measured in nanoseconds), who triggered the event.
We can monitoize separate the changes of a sensor using the onAccurancyChanged method.
Accurancy represent the precision measurement of sensor, described by one of the following constants:
• SensorManager.SENSOR_STATUS_ACCURANCY_LOW – Indicates that the sensor accuracy is low and it requires recalibration.
• SensorManager.SENSOR_STATUS_ACCURANCY_MEDIUM – Data returned by the sensor is on average accuracy, and a recalibration could lead to more accurate results.
• SensorManager.SENSOR_STATUS_ACCURANCY_HIGH – The sensor operates at a maximum accuracy.
• SensorManager.SENSOR_STATUS_UNRELIABLE – Indicates that the data recieved by utilize the sensor is irrelevant. Require recalibration or the data received can not be interpreted.
To capture events from the object of sensor type reacts, we have to set SensorManager an object ofSensorEventListener type, while we specifying in the same time the sensor where is apply and the time at which they want updates.
One of the best practices in the use of sensors is recording the object SensorEventListener type and remove this record by calling register methods, unregister in onResume methods, respectively onPause the activity to ensure that data is only updated when the application is active.
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