if (event.sensor.getType() == Sensor.TYPE_STEP_COUNTER) {
            // TYPE_STEP_COUNTER returns the total number of steps taken by the user since the last reboot (power on) of the phone.
            if (initialCounterSteps < 1)
                initialCounterSteps = (int) event.values[0]; // gets steps to subtract
            // Calculate steps taken since app was opened, paused, reset.
            stepCounter = (int) event.values[0] - initialCounterSteps;
            steps_count_tv.setText(String.valueOf(stepCounter));
        }