Eula.java

/*****************************************************************
BioZen

Copyright (C) 2011 The National Center for Telehealth and 
Technology

Eclipse Public License 1.0 (EPL-1.0)

This library is free software; you can redistribute it and/or
modify it under the terms of the Eclipse Public License as
published by the Free Software Foundation, version 1.0 of the 
License.

The Eclipse Public License is a reciprocal license, under 
Section 3. REQUIREMENTS iv) states that source code for the 
Program is available from such Contributor, and informs licensees 
how to obtain it in a reasonable manner on or through a medium 
customarily used for software exchange.

Post your updates and modifications to our GitHub or email to 
t2@tee2.org.

This library is distributed WITHOUT ANY WARRANTY; without 
the implied warranty of MERCHANTABILITY or FITNESS FOR A 
PARTICULAR PURPOSE.  See the Eclipse Public License 1.0 (EPL-1.0)
for more details.
 
You should have received a copy of the Eclipse Public License
along with this library; if not, 
visit http://www.opensource.org/licenses/EPL-1.0

*****************************************************************/

package com.t2.compassionMeditation;



import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.SharedPreferences;

//Need the following import to get access to the app resources, since this
//class is in a sub-package.
import com.t2.R;

/**
 * Displays an EULA ("End User License Agreement") that the user has to accept before
 * using the application. Your application should call {@link Eula#show(android.app.Activity)}
 * in the onCreate() method of the first activity. If the user accepts the EULA, it will never
 * be shown again. If the user refuses, {@link android.app.Activity#finish()} is invoked
 * on your activity.
 * @see http://code.google.com/p/apps-for-android/source/browse/trunk/Photostream/src/com/google/android/photostream/Eula.java
 */
public class Eula {
    private static final String PREFERENCE_EULA_ACCEPTED = "eula.accepted";
    private static final String PREFERENCES_EULA = "eula";

    /**
     * callback to let the activity know when the user has accepted the EULA.
     */
    static interface OnEulaAgreedTo {

        /**
         * Called when the user has accepted the eula and the dialog closes.
         */
        void onEulaAgreedTo();
    }

    /**
     * Displays the EULA if necessary. This method should be called from the onCreate()
     * method of your main Activity.
     *
     * @param activity The Activity to finish if the user rejects the EULA.
     * @return Whether the user has agreed already.
     */
    public static boolean show(final Activity activity) {
        final SharedPreferences preferences = activity.getSharedPreferences(
			PREFERENCES_EULA,
			Activity.MODE_PRIVATE
		);
        
//        preferences.edit().putBoolean(PREFERENCE_EULA_ACCEPTED, false).commit();
        if(!preferences.getBoolean(PREFERENCE_EULA_ACCEPTED, false)) {
    		AlertDialog.Builder alert = new AlertDialog.Builder(activity);
    		alert.setTitle(R.string.eula_title);
        	alert.setCancelable(true);
        	alert.setPositiveButton(R.string.eula_accept, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    accept(preferences);
                    if (activity instanceof OnEulaAgreedTo) {
                        ((OnEulaAgreedTo) activity).onEulaAgreedTo();
                    }
                }
        	});
        	alert.setNegativeButton(R.string.eula_refuse, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    refuse(activity);
                }
            })
            .setOnCancelListener(new DialogInterface.OnCancelListener() {
                public void onCancel(DialogInterface dialog) {
                    refuse(activity);
                }
            });  
        	
        	alert.setMessage(readEula(activity));        	
    		alert.show();              	
        	
            return false;
        }
        return true;
    }

    private static void accept(SharedPreferences preferences) {
        preferences.edit().putBoolean(PREFERENCE_EULA_ACCEPTED, true).commit();
    }

    private static void refuse(Activity activity) {
        activity.finish();
    }

    private static CharSequence readEula(Activity activity) {
    	return activity.getString(R.string.eula_text);
    }
}