How to add event,reminder in Android 2.3 Calendar through code?

First of all we need to get the calendar provider uri.........

if (Build.VERSION.SDK_INT >= 8 ) {
        l_eventUri = Uri.parse("content://com.android.calendar/events");
    } else {
        l_eventUri = Uri.parse("content://calendar/events");
    }
But below the getCalendarUriBase(this) method is already return to get URI.So no need to use above code.It is just for your understanding.

You'll also need to add these permission to your manifest for this method.........

<uses-permission android:name="android.permission.READ_CALENDAR" />
<uses-permission android:name="android.permission.WRITE_CALENDAR" />

/*
* A device may have more than one Calendar configure in it. So first,
* you must find out available calendar's name and their id.
 */
Cursor cursor = getContentResolver() .query(Uri.parse(getCalendarUriBase(this) ),new String[] { "calendar_id", "displayname" }, null,null, null);
cursor.moveToFirst();
// fetching calendars name
String CNames[] = new String[cursor.getCount()];
// fetching calendars id
int[] CalIds = new int[cursor.getCount()];
for (int i = 0; i < CNames.length; i++) {
CalIds[i] = cursor.getInt(0);
CNames[i] = cursor.getString(1);
cursor.moveToNext();
}



        // get calendar
        Calendar cal = Calendar.getInstance();     
        Uri EVENTS_URI = Uri.parse(getCalendarUriBase(this) + "events");
        ContentResolver cr = getContentResolver();


        // event insert
        ContentValues values = new ContentValues();
        values.put("calendar_id",CalIds);
        values.put("title", "Reminder Title");
        values.put("allDay", 0);
        values.put("dtstart", cal.getTimeInMillis() + 11*60*1000); // event starts at 11 minutes from now
        values.put("dtend", cal.getTimeInMillis()+60*60*1000); // ends 60 minutes from now
        values.put("description", "Reminder description");
        //Event Id
        values.put("_id", scheduleId);  
        //0~ default; 1~ confidential; 2~ private; 3~ public
        values.put("visibility", 0);
        //0~ false; 1~ true
        values.put("hasAlarm", 1);
        //status: 0~ tentative; 1~ confirmed; 2~ canceled
        values.put("eventStatus", 1);
    //0~ opaque, no timing conflict is allowed; 1~ transparency, allow overlap of scheduling
        values.put("transparency", 0);
        Uri event = cr.insert(EVENTS_URI, values);


        // reminder insert
        Uri REMINDERS_URI = Uri.parse(getCalendarUriBase(this) + "reminders");
        values = new ContentValues();
        values.put( "event_id", Long.parseLong(event.getLastPathSegment()));
        values.put( "method", 1 );
        values.put( "minutes", 10 );
        cr.insert( REMINDERS_URI, values );



        // for deleting event
// getContentResolver().delete(path to the content, want to delete,
// CONDITION, ARGUMENTS);
        // CONDITION + ARGUMENTS work as where condition to find a particular

 event.

getContentResolver().delete(
Uri.parse(getCalendarUriBase(this)),
"calendar_id=? and description=? and eventLocation=? ",
new String[] { String.valueOf(CalIds[0]), "Birthday Party",
"Delhi" });


getCalendarUriBase(this) is the method which provides the ContentProvider uri of Android device base on versions...........which is given below....



 private String getCalendarUriBase(Activity act) {
        String calendarUriBase = null;
        Uri calendars = Uri.parse("content://calendar/calendars");
        Cursor managedCursor = null;
        try {
            managedCursor = act.managedQuery(calendars, null, null, null, null);
        } catch (Exception e) {
        }
        if (managedCursor != null) {
            calendarUriBase = "content://calendar/";
        } else {
            calendars = Uri.parse("content://com.android.calendar/calendars");
            try {
                managedCursor = act.managedQuery(calendars, null, null, null, null);
            } catch (Exception e) {
            }
            if (managedCursor != null) {
                calendarUriBase = "content://com.android.calendar/";
            }
        }
        return calendarUriBase;
    }