Inserting recurring event and an event exception for a single instance from recurrence

CalendarEvents.java

/**
* Snippet for inserting a repeating event to meet jerry for 4 consecutive days at tower
* Snipper for adding an exception on repeating event (jerry will be at station on 3rd day, so adding an 
* exception event on 3 day to meet jerry at station)
*/

import android.accounts.Account;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.net.Uri;
import android.provider.CalendarContract;
import android.util.Log;

import java.text.SimpleDateFormat;
import java.util.Locale;

public class CalendarEvents {

    // hardcoded account type for syncAdapter's account authenticator
    private static final String ACCOUNT_TYPE = "me.dlkanth.cal.test";

    // hardcoded Calendar Id
    private static final long CAL_ID = 10;

    private Context context;

    private Account account;

    public CalendarEvents (Context context, Account account) {
        this.context = context;
        this.account = account;
    }

    /*
     * Inserting an event "Meet jerry at the tower" 10am - 11am, from 19th sept, everyday, until 22nd sept
     */
    private String insertRepeatEvent () throws Exception {

        ContentResolver cr = this.context.getContentResolver();
        ContentValues values = new ContentValues();
        values.put(CalendarContract.Events.TITLE, "Meet jerry at the tower");
        values.put(CalendarContract.Events.ALL_DAY, false);
        values.put(CalendarContract.Events.CALENDAR_ID, CAL_ID);

        // dtstart and dtend for the event
        String eventDate = "20150919";
        String startTime = "100000000";
        String endTime = "110000000";

        String eventStartTime = eventDate + startTime;
        String eventEndTime = eventDate + endTime;

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmssSSS", Locale.US);

        values.put(CalendarContract.Events.DTSTART, dateFormat.parse(eventStartTime).getTime());
        values.put(CalendarContract.Events.DTEND, dateFormat.parse(eventEndTime).getTime());
        // rrule for repeating events for consecutive 4 days
        values.put(CalendarContract.Events.RRULE, "FREQ=DAILY;COUNT=4");

        String syncId = System.currentTimeMillis() + "";

        values.put(CalendarContract.Events._SYNC_ID, syncId);

        try {
            Uri uri = cr.insert(eventUriAsSyncAdapter(), values);
            int eventId = Integer.parseInt(uri.getLastPathSegment());
            Log.i("CALENDAR", "Recurring Event Added");

            return syncId;

        } catch (Exception e) {
            Log.e("CALENDAR", "error while inserting", e);
        }

        return null;
    }

    /*
     * Jerry will be at station on 21st sept, so change (exception) in event needed
     *
     * Exception for the original event will be considered with sync_id of the original event.
     * Original Instance time of the event will also be considered for adding exception
     *
     * Original instance time of this exception event will be the 10am on 21st sept.
     */
    private void insertExceptionForRecurringEvent (String syncId) throws Exception {

        ContentResolver cr = this.context.getContentResolver();
        ContentValues values = new ContentValues();
        values.put(CalendarContract.Events.TITLE, "Meet Jerry at the station");
        values.put(CalendarContract.Events.ALL_DAY, false);
        values.put(CalendarContract.Events.CALENDAR_ID, CAL_ID);

        // dtstart and dtend for the event
        String eventDate = "20150919";
        String startTime = "100000000";
        String endTime = "110000000";

        String eventStartTime = eventDate + startTime;
        String eventEndTime = eventDate + endTime;

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmssSSS", Locale.US);

        values.put(CalendarContract.Events.DTSTART, dateFormat.parse(eventStartTime).getTime());
        values.put(CalendarContract.Events.DTEND, dateFormat.parse(eventEndTime).getTime());


        // need to add an exception for recurring event on 21st sept 10 am event
        // calculating original instance time

        String date = "20150921";
        String time = "100000000";

        String originalInstanceTime = date + time;

        // the following values are important for inserting an exception event
        values.put(CalendarContract.Events.ORIGINAL_SYNC_ID, syncId);

        // original instance time of the recurring event on 21st sept
        values.put(CalendarContract.Events.ORIGINAL_INSTANCE_TIME, dateFormat.parse(originalInstanceTime).getTime());

        try {
            Uri uri = cr.insert(eventUriAsSyncAdapter(), values);
            int eventId = Integer.parseInt(uri.getLastPathSegment());
            Log.i("CALENDAR", "Exception Event Added");

        } catch (Exception e) {
            Log.e("CALENDAR", "error while inserting Exception eVent", e);
        }


    }

    private Uri eventUriAsSyncAdapter () {
        Uri uri = Uri.parse(CalendarContract.Events.CONTENT_URI.toString());
        uri = uri.buildUpon().appendQueryParameter(CalendarContract.CALLER_IS_SYNCADAPTER, "true")
                .appendQueryParameter(CalendarContract.Calendars.ACCOUNT_NAME, this.account.name)
                .appendQueryParameter(CalendarContract.Calendars.ACCOUNT_TYPE, ACCOUNT_TYPE).build();
        return uri;
    }

}

excellent, it helped me a lot

You also used 'Events.CONTENT_URI' for the exception date.
Why did you not use 'Events.CONTENT_EXCEPTION_URI' for the exception date instead?