at.ac.uniklu.mobile.sportal.StudentportalApplication.java Source code

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Here is the source code for at.ac.uniklu.mobile.sportal.StudentportalApplication.java

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/*
 * Copyright (c) 2014 Mario Guggenberger <mario.guggenberger@aau.at>
 *
 * This file is part of AAU Studentenportal.
 *
 * AAU Studentenportal is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * AAU Studentenportal is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with AAU Studentenportal.  If not, see <http://www.gnu.org/licenses/>.
 */

package at.ac.uniklu.mobile.sportal;

import java.util.Date;

import org.apache.http.auth.UsernamePasswordCredentials;

import android.app.Application;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.util.Log;
import at.ac.uniklu.mobile.sportal.publictransport.stw.StopDB;
import at.ac.uniklu.mobile.sportal.util.Analytics;
import at.ac.uniklu.mobile.sportal.util.Preferences;

public class StudentportalApplication extends Application {

    private static StudentportalApplication sInstance;

    /*
     * keep a reference to the global state to avoid it being killed 
     * before the application gets killed
     */
    private Studentportal mStudentportal;

    @Override
    public void onCreate() {
        super.onCreate(); // docs say this is needed

        // load default preferences but don't overwrite user set ones
        PreferenceManager.setDefaultValues(this, R.xml.debug_preferences, false);

        mStudentportal = Studentportal.initialize(this);
        sInstance = this;

        Analytics.init(this);
        upgradeHousekeeping();
    }

    public static StudentportalApplication getInstance() {
        return sInstance;
    }

    public Studentportal getStudentportal() {
        return mStudentportal;
    }

    public UsernamePasswordCredentials getUsernamePasswordCredentials() {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        return new UsernamePasswordCredentials(Preferences.getUsername(preferences),
                Preferences.getPassword(preferences));
    }

    /**
     * Housekeeping of preferences on version upgrades.
     */
    private void upgradeHousekeeping() {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);

        int previousVersion = Preferences.getVersioncheckVersion(preferences);
        int currentVersion = Studentportal.getAppInfo().getVersionCode();

        if (currentVersion == previousVersion) {
            return; // no upgrade has happened, nothing to do
        }

        Log.d("StudentenportalApplication",
                "Version upgrade detected: " + previousVersion + " -> " + currentVersion);

        SharedPreferences.Editor editor = preferences.edit();

        if (previousVersion < 18) {
            /* With V18, content of userid has been changed from username/cardid 
             * to userhash, so it needs to be reset for the login procedure to set
             * the hash correctly.
             */
            Preferences.setUserId(preferences, null);
        }

        if (previousVersion < 19) {
            /* STW has changed their system and the stops got new IDs, so the DB 
             * must be cleared from those invalid stops and to trigger the download
             * mechanism of the tops when the BusDeparturesActivity is launched.
             */
            StopDB stopDB = new StopDB(this);
            stopDB.clearStops();
            stopDB.close();
        }

        /* housekeeping finished, finally update the versioncheck code to the 
         * current version to avoid housekeeping until the next version upgrade
         */
        Preferences.setVersioncheckDate(editor, new Date());
        Preferences.setVersioncheckVersion(editor, currentVersion);

        // persist changes
        editor.commit();
    }
}