Java tutorial
/* * Copyright 2012 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.conferenceengineer.android.iosched.service; import android.app.*; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.content.res.Resources; import android.database.Cursor; import android.graphics.Bitmap; import android.net.Uri; import android.support.v4.app.NotificationCompat; import android.support.v4.app.TaskStackBuilder; import com.conferenceengineer.android.iosched.conference686.R; import com.conferenceengineer.android.iosched.provider.ScheduleContract; import com.conferenceengineer.android.iosched.ui.HomeActivity; import com.conferenceengineer.android.iosched.util.UIUtils; import java.util.ArrayList; import static com.conferenceengineer.android.iosched.util.LogUtils.makeLogTag; /** * Background service to handle scheduling of starred session notification via * {@link android.app.AlarmManager}. */ public class SessionAlarmService extends IntentService { private static final String TAG = makeLogTag(SessionAlarmService.class); public static final String ACTION_NOTIFY_SESSION = "com.conferenceengineer.android.iosched.action.NOTIFY_SESSION"; public static final String ACTION_SCHEDULE_STARRED_BLOCK = "com.conferenceengineer.android.iosched.action.SCHEDULE_STARRED_BLOCK"; public static final String ACTION_SCHEDULE_ALL_STARRED_BLOCKS = "com.conferenceengineer.android.iosched.action.SCHEDULE_ALL_STARRED_BLOCKS"; public static final String EXTRA_SESSION_START = "com.conferenceengineer.android.iosched.extra.SESSION_START"; public static final String EXTRA_SESSION_END = "com.conferenceengineer.android.iosched.extra.SESSION_END"; public static final String EXTRA_SESSION_ALARM_OFFSET = "com.conferenceengineer.android.iosched.extra.SESSION_ALARM_OFFSET"; private static final int NOTIFICATION_ID = 100; // pulsate every 1 second, indicating a relatively high degree of urgency private static final int NOTIFICATION_LED_ON_MS = 100; private static final int NOTIFICATION_LED_OFF_MS = 1000; private static final int NOTIFICATION_ARGB_COLOR = 0xff0088ff; // cyan private static final long MILLI_TEN_MINUTES = 600000; private static final long MILLI_ONE_MINUTE = 60000; private static final long UNDEFINED_ALARM_OFFSET = -1; private static final long UNDEFINED_VALUE = -1; public SessionAlarmService() { super(TAG); } @Override protected void onHandleIntent(Intent intent) { final String action = intent.getAction(); if (ACTION_SCHEDULE_ALL_STARRED_BLOCKS.equals(action)) { scheduleAllStarredBlocks(); return; } final long sessionStart = intent.getLongExtra(SessionAlarmService.EXTRA_SESSION_START, UNDEFINED_VALUE); if (sessionStart == UNDEFINED_VALUE) return; final long sessionEnd = intent.getLongExtra(SessionAlarmService.EXTRA_SESSION_END, UNDEFINED_VALUE); if (sessionEnd == UNDEFINED_VALUE) return; final long sessionAlarmOffset = intent.getLongExtra(SessionAlarmService.EXTRA_SESSION_ALARM_OFFSET, UNDEFINED_ALARM_OFFSET); if (ACTION_NOTIFY_SESSION.equals(action)) { notifySession(sessionStart, sessionEnd, sessionAlarmOffset); } else if (ACTION_SCHEDULE_STARRED_BLOCK.equals(action)) { scheduleAlarm(sessionStart, sessionEnd, sessionAlarmOffset); } } private void scheduleAlarm(final long sessionStart, final long sessionEnd, final long alarmOffset) { NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); nm.cancel(NOTIFICATION_ID); final long currentTime = UIUtils.getCurrentTime(this); // If the session is already started, do not schedule system notification. if (currentTime > sessionStart) return; // By default, sets alarm to go off at 10 minutes before session start time. If alarm // offset is provided, alarm is set to go off by that much time from now. long alarmTime; if (alarmOffset == UNDEFINED_ALARM_OFFSET) { alarmTime = sessionStart - MILLI_TEN_MINUTES; } else { alarmTime = currentTime + alarmOffset; } final Intent notifIntent = new Intent(ACTION_NOTIFY_SESSION, null, this, SessionAlarmService.class); // Setting data to ensure intent's uniqueness for different session start times. notifIntent.setData(new Uri.Builder().authority("com.conferenceengineer.android.iosched") .path(String.valueOf(sessionStart)).build()); notifIntent.putExtra(SessionAlarmService.EXTRA_SESSION_START, sessionStart); notifIntent.putExtra(SessionAlarmService.EXTRA_SESSION_END, sessionEnd); notifIntent.putExtra(SessionAlarmService.EXTRA_SESSION_ALARM_OFFSET, alarmOffset); PendingIntent pi = PendingIntent.getService(this, 0, notifIntent, PendingIntent.FLAG_CANCEL_CURRENT); final AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE); // Schedule an alarm to be fired to notify user of added sessions are about to begin. am.set(AlarmManager.RTC_WAKEUP, alarmTime, pi); } // Starred sessions are about to begin. Constructs and triggers system notification. private void notifySession(final long sessionStart, final long sessionEnd, final long alarmOffset) { long currentTime; if (sessionStart < (currentTime = UIUtils.getCurrentTime(this))) return; // Avoid repeated notifications. if (alarmOffset == UNDEFINED_ALARM_OFFSET && UIUtils.isNotificationFiredForBlock(this, ScheduleContract.Blocks.generateBlockId(sessionStart, sessionEnd))) { return; } final ContentResolver cr = getContentResolver(); final Uri starredBlockUri = ScheduleContract.Blocks .buildStarredSessionsUri(ScheduleContract.Blocks.generateBlockId(sessionStart, sessionEnd)); Cursor c = cr.query(starredBlockUri, SessionDetailQuery.PROJECTION, null, null, null); int starredCount = 0; ArrayList<String> starredSessionTitles = new ArrayList<String>(); ArrayList<String> starredSessionRoomIds = new ArrayList<String>(); String sessionId = null; // needed to get session track icon while (c.moveToNext()) { sessionId = c.getString(SessionDetailQuery.SESSION_ID); starredCount = c.getInt(SessionDetailQuery.NUM_STARRED_SESSIONS); starredSessionTitles.add(c.getString(SessionDetailQuery.SESSION_TITLE)); starredSessionRoomIds.add(c.getString(SessionDetailQuery.ROOM_ID)); } if (starredCount < 1) { return; } // Generates the pending intent which gets fired when the user taps on the notification. // NOTE: Use TaskStackBuilder to comply with Android's design guidelines // related to navigation from notifications. PendingIntent pi = TaskStackBuilder.create(this).addNextIntent(new Intent(this, HomeActivity.class)) .addNextIntent(new Intent(Intent.ACTION_VIEW, starredBlockUri)) .getPendingIntent(0, PendingIntent.FLAG_CANCEL_CURRENT); final Resources res = getResources(); String contentText; int minutesLeft = (int) (sessionStart - currentTime + 59000) / 60000; if (minutesLeft < 1) { minutesLeft = 1; } if (starredCount == 1) { contentText = res.getString(R.string.session_notification_text_1, minutesLeft); } else { contentText = res.getQuantityString(R.plurals.session_notification_text, starredCount - 1, minutesLeft, starredCount - 1); } NotificationCompat.Builder notifBuilder = new NotificationCompat.Builder(this) .setContentTitle(starredSessionTitles.get(0)).setContentText(contentText) .setTicker(res.getQuantityString(R.plurals.session_notification_ticker, starredCount, starredCount)) .setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE) .setLights(SessionAlarmService.NOTIFICATION_ARGB_COLOR, SessionAlarmService.NOTIFICATION_LED_ON_MS, SessionAlarmService.NOTIFICATION_LED_OFF_MS) .setSmallIcon(R.drawable.conference_ic_notification).setContentIntent(pi) .setPriority(Notification.PRIORITY_MAX).setAutoCancel(true); if (starredCount == 1) { // get the track icon to show as the notification big picture Uri tracksUri = ScheduleContract.Sessions.buildTracksDirUri(sessionId); Cursor tracksCursor = cr.query(tracksUri, SessionTrackQuery.PROJECTION, null, null, null); if (tracksCursor.moveToFirst()) { String trackName = tracksCursor.getString(SessionTrackQuery.TRACK_NAME); int trackColour = tracksCursor.getInt(SessionTrackQuery.TRACK_COLOR); Bitmap trackIcon = UIUtils.getTrackIconSync(getApplicationContext(), trackName, trackColour); if (trackIcon != null) { notifBuilder.setLargeIcon(trackIcon); } } } if (minutesLeft > 5) { notifBuilder.addAction(R.drawable.ic_alarm_holo_dark, String.format(res.getString(R.string.snooze_x_min), 5), createSnoozeIntent(sessionStart, sessionEnd, 5)); } NotificationCompat.InboxStyle richNotification = new NotificationCompat.InboxStyle(notifBuilder) .setBigContentTitle(res.getQuantityString(R.plurals.session_notification_title, starredCount, minutesLeft, starredCount)); // Adds starred sessions starting at this time block to the notification. for (int i = 0; i < starredCount; i++) { richNotification.addLine(starredSessionTitles.get(i)); } NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); nm.notify(NOTIFICATION_ID, richNotification.build()); } private PendingIntent createSnoozeIntent(final long sessionStart, final long sessionEnd, final int snoozeMinutes) { Intent scheduleIntent = new Intent(SessionAlarmService.ACTION_SCHEDULE_STARRED_BLOCK, null, this, SessionAlarmService.class); scheduleIntent.putExtra(SessionAlarmService.EXTRA_SESSION_START, sessionStart); scheduleIntent.putExtra(SessionAlarmService.EXTRA_SESSION_END, sessionEnd); scheduleIntent.putExtra(SessionAlarmService.EXTRA_SESSION_ALARM_OFFSET, snoozeMinutes * MILLI_ONE_MINUTE); return PendingIntent.getService(this, 0, scheduleIntent, PendingIntent.FLAG_CANCEL_CURRENT); } private void scheduleAllStarredBlocks() { final ContentResolver cr = getContentResolver(); final Cursor c = cr.query( ScheduleContract.Sessions.CONTENT_STARRED_URI, new String[] { "distinct " + ScheduleContract.Sessions.BLOCK_START, ScheduleContract.Sessions.BLOCK_END }, null, null, null); if (c == null) { return; } while (c.moveToNext()) { final long sessionStart = c.getLong(0); final long sessionEnd = c.getLong(1); scheduleAlarm(sessionStart, sessionEnd, UNDEFINED_ALARM_OFFSET); } } public interface SessionDetailQuery { String[] PROJECTION = { ScheduleContract.Sessions.SESSION_ID, ScheduleContract.Blocks.NUM_STARRED_SESSIONS, ScheduleContract.Sessions.SESSION_TITLE, ScheduleContract.Sessions.ROOM_ID }; int SESSION_ID = 0; int NUM_STARRED_SESSIONS = 1; int SESSION_TITLE = 2; int ROOM_ID = 3; } public interface SessionTrackQuery { String[] PROJECTION = { ScheduleContract.Tracks.TRACK_ID, ScheduleContract.Tracks.TRACK_NAME, ScheduleContract.Tracks.TRACK_COLOR }; int TRACK_ID = 0; int TRACK_NAME = 1; int TRACK_COLOR = 2; } }