PhoneGapManager.java

package org.geogebra.web.touch;

import org.geogebra.common.util.debug.Log;

import com.google.gwt.core.client.GWT;
import com.googlecode.gwtphonegap.client.PhoneGap;
import com.googlecode.gwtphonegap.client.PhoneGapAvailableEvent;
import com.googlecode.gwtphonegap.client.PhoneGapAvailableHandler;
import com.googlecode.gwtphonegap.client.event.BackButtonPressedHandler;

public class PhoneGapManager {

	private static PhoneGap phoneGap = (PhoneGap) GWT.create(PhoneGap.class);

	public static PhoneGap getPhoneGap() {
		return phoneGap;
	}

	public static void initializePhoneGap(final BackButtonPressedHandler handler) {
		if (handler != null) {
			phoneGap.addHandler(new PhoneGapAvailableHandler() {

				@Override
				public void onPhoneGapAvailable(PhoneGapAvailableEvent event) {
					try {
						phoneGap.getEvent().getBackButton()
						        .addBackButtonPressedHandler(handler);
					} catch (Throwable t) {
						Log.error("No back button event.");
					}

				}
			});
		}
		phoneGap.initializePhoneGap();
	}
}