ICalParser for parsing ics files. Read ical files(.ics) and provide Content Values for adding it to Android Calendar.

ICALParser.java

import android.content.ContentValues;
import android.net.Uri;
import android.provider.CalendarContract;
import net.fortuna.ical4j.data.CalendarBuilder;
import net.fortuna.ical4j.data.ParserException;
import net.fortuna.ical4j.model.Calendar;
import net.fortuna.ical4j.model.Component;
import net.fortuna.ical4j.model.Property;
import net.fortuna.ical4j.model.component.Daylight;
import net.fortuna.ical4j.model.component.Observance;
import net.fortuna.ical4j.model.component.Standard;
import net.fortuna.ical4j.model.component.VEvent;
import net.fortuna.ical4j.model.component.VTimeZone;
import java.io.IOException;
import java.io.InputStream;
import java.util.TimeZone;

public class ICALParser {

    private static final String TAG = "ICALParser";
    private Calendar calendar;
    private VEvent event;
    private Daylight daylight;
    private VTimeZone vTimeZone;
    private Standard standard;

    public ICALParser(InputStream inputStream) throws IOException, ParserException {
        CalendarBuilder builder = new CalendarBuilder();
        calendar = builder.build(inputStream);
        event = findFirstEvent(calendar);
        vTimeZone = findFirstTimeZone(calendar);
        daylight = findFirstDayLight(vTimeZone);
        standard = findFirstStandard(vTimeZone);

    }

    public ContentValues buildContentValues() {
        ContentValues values = new ContentValues();
        TimeZone timeZone = null;

        values.put(CalendarContract.Events.HAS_ALARM,1);
        values.put(CalendarContract.Events.CALENDAR_ID, 1);

        for (Object o : vTimeZone.getProperties()) {
            Property property = (Property) o;

            switch (property.getName()){
                case "TZID":
                    values.put(CalendarContract.Events.EVENT_TIMEZONE, DateUtils.getTimeZone(property.getValue()).getID());
                    values.put(CalendarContract.Events.EVENT_END_TIMEZONE, DateUtils.getTimeZone(property.getValue()).getID());
                    timeZone = DateUtils.getTimeZone(property.getValue());
                    break;
            }
        }

        for (Object o : event.getProperties()) {
            Property property = (Property) o;
            switch (property.getName()){
                case "DTEND":
                    values.put(CalendarContract.Events.DTEND, DateUtils.parseDateForContentValues(property.getValue(), timeZone).getTime());
                    break;
                case "DTSTART":
                    values.put(CalendarContract.Events.DTSTART, DateUtils.parseDateForContentValues(property.getValue(), timeZone).getTime());
                    break;
                case "DESCRIPTION":
                    values.put(CalendarContract.Events.DESCRIPTION, property.getValue());
                    break;
                case "LOCATION":
                    values.put(CalendarContract.Events.EVENT_LOCATION, property.getValue());
                    break;
                case "SUMMARY":
                    values.put(CalendarContract.Events.TITLE, property.getValue());
                    break;
            }
        }

        return values;
        
    }

    public void setReminder(long eventId) {
        String reminderUriString = "content://com.android.calendar/reminders";
        ContentValues reminderValues = new ContentValues();
        reminderValues.put(CalendarContract.Reminders.EVENT_ID, eventId);
        reminderValues.put(CalendarContract.Reminders.MINUTES, Constants.CalendarEvents.REMINDER_MINUTES);
        reminderValues.put(CalendarContract.Reminders.METHOD, CalendarContract.Reminders.METHOD_ALERT);
        Equinox.getInstance().getApplicationContext().getContentResolver().insert(Uri.parse(reminderUriString), reminderValues);
    }

    private VEvent findFirstEvent(Calendar calendar){
        for (Object o : calendar.getComponents()) {
            Component c = (Component) o;
            VEvent e = c instanceof VEvent ? ((VEvent) c) : null;
            if (e != null) {
                return e;
            }
        }
        return null;
    }

    private Standard findFirstStandard(VTimeZone vTimeZone) {
        for (Object o : vTimeZone.getObservances()) {
            Observance c = (Observance) o;
            Standard s = c instanceof Standard ? ((Standard) c) : null;
            if (s != null) {
                return s;
            }
        }
        return null;
    }

    private VTimeZone findFirstTimeZone(Calendar calendar) {
        for (Object o : calendar.getComponents()) {
            Component c = (Component) o;
            VTimeZone vt = c instanceof VTimeZone ? ((VTimeZone) c) : null;
            if (vt != null) {
                return vt;
            }
        }
        return null;
    }

    private Daylight findFirstDayLight(VTimeZone vTimeZone) {
        for (Object o : vTimeZone.getObservances()) {
            Observance c = (Observance) o;
            Daylight d = c instanceof Daylight ? ((Daylight) c) : null;
            if (d != null) {
                return d;
            }
        }
        return null;
    }
}