Orientation track by sensor android

OrientationHandler.java

import static android.content.res.Configuration.ORIENTATION_LANDSCAPE;
import static android.content.res.Configuration.ORIENTATION_PORTRAIT;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;

/**
 * @author Gopal chaudhary
 * */
public class OrientationHandler {

    private SensorManager sensorManager;
    private OrientationListener listener;

    public void trackOrientation (Context context, OrientationListener listener) {

        this.listener = listener;

        if (sensorManager == null)
            sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);

        sensorManager.registerListener(_listener,
                sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
                SensorManager.SENSOR_DELAY_UI);

    }



    private final SensorEventListener _listener = new SensorEventListener() {
        @Override
        public void onSensorChanged(SensorEvent sensorEvent) {

            if (sensorEvent == null || listener == null) return;

            double x1 = Math.abs(sensorEvent.values[0]);
            double x2 = Math.abs(sensorEvent.values[1]);

            if (x1 > 5 || x2 > 5) {

                listener.onChange(x1 > x2 ? ORIENTATION_LANDSCAPE : ORIENTATION_PORTRAIT);

            }

        }

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

        }
    };

    public void dispose() {

        if (sensorManager != null)
            sensorManager.unregisterListener(_listener);

    }

}

OrientationListener.java

public interface OrientationListener {
    void onChange(int orientation);
}