how to unregister multiple sensors android

Question

I registered 3 sensors to my sensor manager:

if(sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER) !=null ){
        accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        sensorManager.registerListener(this,accelerometer,SensorManager.SENSOR_DELAY_NORMAL);
    }

    if(sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE) !=null ){
        gyroscope = sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
        sensorManager.registerListener(this,gyroscope,SensorManager.SENSOR_DELAY_NORMAL);
    }

    if(sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD) !=null ){
        magnetometer = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
        sensorManager.registerListener(this,magnetometer,SensorManager.SENSOR_DELAY_NORMAL);
    }

and my onResume method:

@Override
protected void onResume() {
    super.onResume();
    sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
    sensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_NORMAL);
    sensorManager.registerListener(this, gyroscope, SensorManager.SENSOR_DELAY_NORMAL);

}

so when I unregister the sensor manager, should I unregister 3 times, or just once? Currently I use this:

 @Override
protected void onPause() {
    super.onPause();
    sensorManager.unregisterListener(this);
}

Answer 1

When you register the listeners you declarare a SensorListener (in this case I guess is your activity that implements SensorEventListener ):

sensorManager.registerListener(this,accelerometer,SensorManager.SENSOR_DELAY_NORMAL);
//                             ↑  here

So use only once unregisterListener because you don't unregister individual sensors, you unregister SensorListener as you can see in method signature:

public void unregisterListener (SensorListener listener)

UPDATE:
if you need to disconnect an individual sensor just use the overloaded version of unregisterListener

public void unregisterListener (SensorEventListener listener, Sensor sensor)