Utils.java

package Utilities;

import android.view.OrientationEventListener;

public class Utils {

	// Orientation hysteresis amount used in rounding, in degrees
	public static final int ORIENTATION_HYSTERESIS = 5;
	
	public static int roundOrientation(int orientation, int orientationHistory) {
		boolean changeOrientation = false;
		if (orientationHistory == OrientationEventListener.ORIENTATION_UNKNOWN) {
			changeOrientation = true;
		} else {
			int dist = Math.abs(orientation - orientationHistory);
			dist = Math.min(dist, 360 - dist);
			changeOrientation = (dist >= 45 + ORIENTATION_HYSTERESIS);
		}
		if (changeOrientation) {
			return ((orientation + 45) / 90 * 90) % 360;
		}
		return orientationHistory;
	}
}