Android Open Source - Android-CalendarService Calendar Service

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License

The source code is released under:

Apache License

Java Source Code

package dk.CalendarService;
//from w  ww  .  j a v a 2 s .c o m
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.text.format.DateUtils;

/* 
 * Created by David Laundav and contributed by Christian Orthmann
 * 
 * Copyright 2013 Daivd Laundav
 *
 * 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.
 */
 
/*
 * References:
 * http://stackoverflow.com/questions/5883938/getting-events-from-calendar
 * 
 * Please do not delete the references as they gave inspiration for the implementation
 */


public class CalendarService {
  
  // Default constructor
  public static void readCalendar(Context context) {
    readCalendar(context, 1, 0);
  }

  // Use to specify specific the time span
  public static void readCalendar(Context context, int days, int hours) {
    
    ContentResolver contentResolver = context.getContentResolver();
     
    // Create a cursor and read from the calendar (for Android API below 4.0)
    final Cursor cursor = contentResolver.query(Uri.parse("content://com.android.calendar/calendars"),
            (new String[] { "_id", "displayName", "selected" }), null, null, null);
    
    /*
    * Use the cursor below for Android API 4.0+ (Thanks to SLEEPLisNight)
    *
    * Cursor cursor = contentResolver.query(Uri.parse("content://com.android.calendar/events"), 
    * new String[]{ "calendar_id", "title", "description", "dtstart", "dtend", "eventLocation" }, 
    * null, null, null);
    *
    */
    
    // Create a set containing all of the calendar IDs available on the phone
    HashSet<String> calendarIds = getCalenderIds(cursor);
    
    // Create a hash map of calendar ids and the events of each id
    HashMap<String, List<CalendarEvent>> eventMap = new HashMap<String, List<CalendarEvent>>();
    
    // Loop over all of the calendars
    for (String id : calendarIds) {
      
      // Create a builder to define the time span
      Uri.Builder builder = Uri.parse("content://com.android.calendar/instances/when").buildUpon();
          long now = new Date().getTime();

          // create the time span based on the inputs
          ContentUris.appendId(builder, now - (DateUtils.DAY_IN_MILLIS * days) - (DateUtils.HOUR_IN_MILLIS * hours));
          ContentUris.appendId(builder, now + (DateUtils.DAY_IN_MILLIS * days) + (DateUtils.HOUR_IN_MILLIS * hours));
          
          // Create an event cursor to find all events in the calendar
          Cursor eventCursor = contentResolver.query(builder.build(),
                  new String[]  { "title", "begin", "end", "allDay"}, "Calendars._id=" + id,
                  null, "startDay ASC, startMinute ASC");
          
          System.out.println("eventCursor count="+eventCursor.getCount());
          
          // If there are actual events in the current calendar, the count will exceed zero
          if(eventCursor.getCount()>0)
          {
            
            // Create a list of calendar events for the specific calendar
            List<CalendarEvent> eventList = new ArrayList<CalendarEvent>();
                
            // Move to the first object
              eventCursor.moveToFirst();
              
              // Create an object of CalendarEvent which contains the title, when the event begins and ends, 
              // and if it is a full day event or not 
              CalendarEvent ce = loadEvent(eventCursor);
              
              // Adds the first object to the list of events
              eventList.add(ce);

              System.out.println(ce.toString());

              // While there are more events in the current calendar, move to the next instance
              while (eventCursor.moveToNext())
              {
                
                // Adds the object to the list of events
                ce = loadEvent(eventCursor);
                eventList.add(ce);
                
                System.out.println(ce.toString());
                
              }
              
            Collections.sort(eventList);
            eventMap.put(id, eventList);
            
            System.out.println(eventMap.keySet().size() + " " + eventMap.values());
            
          }
    }
  }
  
  // Returns a new instance of the calendar object
  private static CalendarEvent loadEvent(Cursor csr) {
    return new CalendarEvent(csr.getString(0), 
            new Date(csr.getLong(1)),
            new Date(csr.getLong(2)), 
            !csr.getString(3).equals("0"));
  }
  
  // Creates the list of calendar ids and returns it in a set
  private static HashSet<String> getCalenderIds(Cursor cursor) {
    
    HashSet<String> calendarIds = new HashSet<String>();
    
    try
      {
          
      // If there are more than 0 calendars, continue
          if(cursor.getCount() > 0)
          {
            
            // Loop to set the id for all of the calendars
            while (cursor.moveToNext()) {
  
                 String _id = cursor.getString(0);
                 String displayName = cursor.getString(1);
                 Boolean selected = !cursor.getString(2).equals("0");
  
                System.out.println("Id: " + _id + " Display Name: " + displayName + " Selected: " + selected);
                calendarIds.add(_id);
                
              }
          } 
      }
    
      catch(AssertionError ex)
      {
          ex.printStackTrace();
      }
      catch(Exception e)
      {
          e.printStackTrace();
      }
    
    return calendarIds;
    
  }
}

Java Source Code List

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