Android example source code file (CheckUpdateService.java)

This example Android source code file (CheckUpdateService.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

alarmmanager, android, app, application, calendar, checkforupdatestask, content, contentvalues, debug, flickr, integer, intent, notificationmanager, object, os, override, string, updates_check_interval, util, void

The CheckUpdateService.java Android example source code

/*
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.android.photostream;

import android.app.Service;
import android.app.NotificationManager;
import android.app.Notification;
import android.app.PendingIntent;
import android.app.AlarmManager;
import android.os.IBinder;
import android.os.SystemClock;
import android.content.Intent;
import android.content.Context;
import android.content.ContentValues;
import android.content.SharedPreferences;
import android.database.sqlite.SQLiteDatabase;
import android.database.Cursor;
import android.net.Uri;
import android.text.TextUtils;

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;

/**
 * CheckUpdateService checks every 24 hours if updates have been made to the photostreams
 * of the current contacts. This service simply polls an RSS feed and compares the
 * modification timestamp with the one stored in the database.
 */
public class CheckUpdateService extends Service {
    private static boolean DEBUG = false;

    // Check interval: every 24 hours
    private static long UPDATES_CHECK_INTERVAL = 24 * 60 * 60 * 1000;

    private CheckForUpdatesTask mTask;

    @Override
    public void onStart(Intent intent, int startId) {
        super.onStart(intent, startId);
        (mTask = new CheckForUpdatesTask()).execute();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (mTask != null && mTask.getStatus() == UserTask.Status.RUNNING) {
            mTask.cancel(true);
        }
    }

    public IBinder onBind(Intent intent) {
        return null;
    }

    static void schedule(Context context) {
        final Intent intent = new Intent(context, CheckUpdateService.class);
        final PendingIntent pending = PendingIntent.getService(context, 0, intent, 0);

        Calendar c = new GregorianCalendar();
        c.add(Calendar.DAY_OF_YEAR, 1);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);

        final AlarmManager alarm = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarm.cancel(pending);
        if (DEBUG) {
            alarm.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(),
                    30 * 1000, pending);
        } else {
            alarm.setRepeating(AlarmManager.RTC, c.getTimeInMillis(),
                    UPDATES_CHECK_INTERVAL, pending);
        }
    }

    private class CheckForUpdatesTask extends UserTask<Void, Object, Void> {
        private SharedPreferences mPreferences;
        private NotificationManager mManager;

        @Override
        public void onPreExecute() {
            mPreferences = getSharedPreferences(Preferences.NAME, MODE_PRIVATE);
            mManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        }

        public Void doInBackground(Void... params) {
            final UserDatabase helper = new UserDatabase(CheckUpdateService.this);
            final SQLiteDatabase database = helper.getWritableDatabase();

            Cursor cursor = null;
            try {
                cursor = database.query(UserDatabase.TABLE_USERS,
                        new String[] { UserDatabase._ID, UserDatabase.COLUMN_NSID,
                        UserDatabase.COLUMN_REALNAME, UserDatabase.COLUMN_LAST_UPDATE },
                        null, null, null, null, null);

                int idIndex = cursor.getColumnIndexOrThrow(UserDatabase._ID);
                int realNameIndex = cursor.getColumnIndexOrThrow(UserDatabase.COLUMN_REALNAME);
                int nsidIndex = cursor.getColumnIndexOrThrow(UserDatabase.COLUMN_NSID);
                int lastUpdateIndex = cursor.getColumnIndexOrThrow(UserDatabase.COLUMN_LAST_UPDATE);

                final Flickr flickr = Flickr.get();

                final Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
                final Calendar reference = Calendar.getInstance();

                while (!isCancelled() && cursor.moveToNext()) {
                    final String nsid = cursor.getString(nsidIndex);
                    calendar.setTimeInMillis(cursor.getLong(lastUpdateIndex));

                    reference.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),
                            calendar.get(Calendar.DAY_OF_MONTH), calendar.get(Calendar.HOUR_OF_DAY),
                            calendar.get(Calendar.MINUTE), calendar.get(Calendar.SECOND));

                    if (flickr.hasUpdates(Flickr.User.fromId(nsid), reference)) {
                        publishProgress(nsid, cursor.getString(realNameIndex),
                                cursor.getInt(idIndex));
                    }
                }

                final ContentValues values = new ContentValues();
                values.put(UserDatabase.COLUMN_LAST_UPDATE, System.currentTimeMillis());

                database.update(UserDatabase.TABLE_USERS, values, null, null);
            } finally {
                if (cursor != null) cursor.close();
                database.close();
            }

            return null;
        }

        @Override
        public void onProgressUpdate(Object... values) {
            if (mPreferences.getBoolean(Preferences.KEY_ENABLE_NOTIFICATIONS, true)) {
                final Integer id = (Integer) values[2];
                final Intent intent = new Intent(PhotostreamActivity.ACTION);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
                intent.putExtra(PhotostreamActivity.EXTRA_NOTIFICATION, id);
                intent.putExtra(PhotostreamActivity.EXTRA_NSID, values[0].toString());

                Notification notification = new Notification(R.drawable.stat_notify,
                        getString(R.string.notification_new_photos, values[1]),
                        System.currentTimeMillis());
                notification.setLatestEventInfo(CheckUpdateService.this,
                        getString(R.string.notification_title),
                        getString(R.string.notification_contact_has_new_photos, values[1]),
                        PendingIntent.getActivity(CheckUpdateService.this, 0, intent,
                                PendingIntent.FLAG_CANCEL_CURRENT));

                if (mPreferences.getBoolean(Preferences.KEY_VIBRATE, false)) {
                    notification.defaults |= Notification.DEFAULT_VIBRATE;
                }

                String ringtoneUri = mPreferences.getString(Preferences.KEY_RINGTONE, null);
                notification.sound = TextUtils.isEmpty(ringtoneUri) ? null : Uri.parse(ringtoneUri);

                mManager.notify(id, notification);
            }
        }

        @Override
        public void onPostExecute(Void aVoid) {
            stopSelf();
        }
    }
}