Java tutorial
/* * This file is part of ExpirySync. * * ExpirySync 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. * ExpirySync 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 ExpirySync. If not, see <http://www.gnu.org/licenses/> */ package at.florian_lentsch.expirysync; import java.util.ArrayList; import java.util.Calendar; import java.util.List; import java.util.TimeZone; import org.apache.commons.lang.StringUtils; import org.joda.time.DateTime; import android.app.AlarmManager; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.content.res.Resources; import android.provider.Settings; import android.support.v4.app.NotificationCompat; import android.support.v4.app.TaskStackBuilder; import android.util.Log; import at.florian_lentsch.expirysync.db.DatabaseManager; import at.florian_lentsch.expirysync.model.ProductEntry; /** * Handles daily checking for expired products (or products that going to expire * soon) * * @author Florian Lentsch <office@florian-lentsch.at> * */ public class NotifyChecker extends BroadcastReceiver { static final int WASTE_NOTIFICATION = 1; /** * Sets the alarm that checks for products soon to expire (or already have * expired) * * @param context */ protected static void setAlarm(Context context) { Context appContext = context.getApplicationContext(); Intent receiverIntent = new Intent(appContext, NotifyChecker.class); // Fetch info about when the alarm is to sound each day from the shared // preferences: long firstStartMillis = getFirstStartMillis(appContext); if (firstStartMillis < 0) { Log.i("Alarm", "Alert time not configured - not setting alarm"); return; } Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(firstStartMillis); // Log.i("Alarm", "Setting alarm: " + firstStartMillis + ", " + (new // SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", // Locale.US)).format(firstStartMillis)); // Set the alarm: PendingIntent alarmIntent = PendingIntent.getBroadcast(appContext, 0, receiverIntent, PendingIntent.FLAG_UPDATE_CURRENT); AlarmManager alarmMgr = (AlarmManager) appContext.getSystemService(Context.ALARM_SERVICE); alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, firstStartMillis, AlarmManager.INTERVAL_DAY, alarmIntent); } private static long getFirstStartMillis(Context appContext) { final SharedPreferences sharedPref = appContext.getSharedPreferences("main", Context.MODE_PRIVATE); long firstStartMillis = sharedPref.getLong(SettingsActivity.KEY_ALERT_TIME, -1); if (firstStartMillis == -1) { return -1; } Calendar midnight = Calendar.getInstance(TimeZone.getTimeZone("UTC")); midnight.set(Calendar.HOUR_OF_DAY, 0); midnight.set(Calendar.MINUTE, 0); midnight.set(Calendar.SECOND, 0); midnight.set(Calendar.MILLISECOND, 0); // add "today at 0:00" to the ms value for the alarm (else the alarm // would be scheduled for 1970-01-01): firstStartMillis += midnight.getTimeInMillis(); // if we're already past the alarm time today, we need to add another // day: if (firstStartMillis <= Calendar.getInstance().getTimeInMillis()) { firstStartMillis += AlarmManager.INTERVAL_DAY; } return firstStartMillis; } /** * (non-Javadoc) The alarm has been triggered -> create a notification, if * there are any expired products (or any that will soon expire) */ @Override public void onReceive(Context context, Intent intent) { Context appContext = context.getApplicationContext(); final SharedPreferences sharedPref = appContext.getSharedPreferences("main", Context.MODE_PRIVATE); int daysBeforeMedium = sharedPref.getInt(SettingsActivity.KEY_DAYS_BEFORE_MEDIUM, 0); DatabaseManager.init(appContext); List<ProductEntry> products = DatabaseManager.getInstance().getAllProductEntries(); List<String> expiringProducts = new ArrayList<String>(); for (ProductEntry productEntry : products) { if ((new DateTime(productEntry.expiration_date)).minusDays(daysBeforeMedium).isBeforeNow()) { expiringProducts.add(productEntry.amount + "x " + productEntry.article.name); } } if (expiringProducts.size() > 0) { this.createExpiryNotification(appContext, expiringProducts); } } private void createExpiryNotification(Context appContext, List<String> expiringProducts) { Resources res = appContext.getResources(); NotificationCompat.Builder builder = new NotificationCompat.Builder(appContext) .setSmallIcon(R.drawable.ic_launcher) .setContentTitle(res.getQuantityString(R.plurals.numberOfItemsToBeEaten, expiringProducts.size(), expiringProducts.size())) .setContentText(StringUtils.join(expiringProducts, System.getProperty("line.separator"))) .setSound(Settings.System.DEFAULT_NOTIFICATION_URI).setAutoCancel(true); // Creates an explicit intent for an Activity in your app Intent resultIntent = new Intent(appContext, ProductListActivity.class); // set stack (for the back button to work correctly): TaskStackBuilder stackBuilder = TaskStackBuilder.create(appContext); stackBuilder.addParentStack(ProductListActivity.class); stackBuilder.addNextIntent(resultIntent); PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT); builder.setContentIntent(resultPendingIntent); NotificationManager notificationManager = (NotificationManager) appContext .getSystemService(Context.NOTIFICATION_SERVICE); // display the notification: notificationManager.notify(WASTE_NOTIFICATION, builder.build()); } }