Colour changing using accelerometer sensor(x,y,z)

public class MainActivity extends AppCompatActivity implements SensorEventListener {

    private TextView xText, yText, zText;
    private SensorManager sensorManager;
    private Sensor mySensor;
    private boolean color = false;
    private View view;
    private long lastUpdate;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mySensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        sensorManager.registerListener(this,mySensor,SensorManager.SENSOR_DELAY_NORMAL);

        xText = (TextView) findViewById(R.id.textViewX);
        yText = (TextView) findViewById(R.id.textViewY);
        zText = (TextView) findViewById(R.id.textViewZ);

        view = findViewById(R.id.change);
        view.setBackgroundColor(Color.GREEN);
        lastUpdate = System.currentTimeMillis();
    }

    @Override    public void onSensorChanged(SensorEvent sensorEvent) {

        xText.setText("X: "+ sensorEvent.values[0]);
        yText.setText("Y: "+ sensorEvent.values[1]);
        zText.setText("Z: "+ sensorEvent.values[2]);

        if(sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
        {
            getAccelerometer(sensorEvent);
        }
    }

    private void getAccelerometer(SensorEvent sensorEvent) {

        float[] values = sensorEvent.values;

        float x = values[0];
        float y = values[1];
        float z = values[2];

        float accelerationSquareRoot= (x * x + y * y + z * z) / (SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH);

        long actualTime = sensorEvent.timestamp;
        if(accelerationSquareRoot >= 2)
        {
            if(actualTime - lastUpdate < 200)
            {
                return;
            }
            lastUpdate = actualTime;
            Toast.makeText(this, "Device was shuffled", Toast.LENGTH_SHORT).show();

            if(color)
            {
             view.setBackgroundColor(Color.GREEN);
            }else            {
                view.setBackgroundColor(Color.RED);
            }
            color = !color;
        }
    }

    @Override    public void onAccuracyChanged(Sensor sensor, int i) {

    }

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




}