Add Events on Google Calendar on Android Froyo and above

gistfile1.java

/**
 * Adds the event to a calendar. It lets the user choose the calendar
 * @param ctx Context ( Please use the application context )
 * @param title title of the event
 * @param dtstart Start time: The value is the number of milliseconds since Jan. 1, 1970, midnight GMT.
 * @param dtend End time: The value is the number of milliseconds since Jan. 1, 1970, midnight GMT.
 */
private static void addToCalendar(Context ctx, final String title, final long dtstart, final long dtend) {
    final ContentResolver cr = ctx.getContentResolver();
    Cursor cursor ;
    if (Integer.parseInt(Build.VERSION.SDK) >= 8 )
        cursor = cr.query(Uri.parse("content://com.android.calendar/calendars"), new String[]{ "_id", "displayname" }, null, null, null);
    else
        cursor = cr.query(Uri.parse("content://calendar/calendars"), new String[]{ "_id", "displayname" }, null, null, null);
    if ( cursor.moveToFirst() ) {
        final String[] calNames = new String[cursor.getCount()];
        final int[] calIds = new int[cursor.getCount()];
        for (int i = 0; i < calNames.length; i++) {
            calIds[i] = cursor.getInt(0);
            calNames[i] = cursor.getString(1);
            cursor.moveToNext();
        }
 
        AlertDialog.Builder builder = new AlertDialog.Builder(ctx);
        builder.setSingleChoiceItems(calNames, -1, new DialogInterface.OnClickListener() {
 
            @Override
            public void onClick(DialogInterface dialog, int which) {
                ContentValues cv = new ContentValues();
                cv.put("calendar_id", calIds[which]);
                cv.put("title", title);
                cv.put("dtstart", dtstart );
                cv.put("hasAlarm", 1);
                cv.put("dtend", dtend);
 
                Uri newEvent ;
                if (Integer.parseInt(Build.VERSION.SDK) >= 8 )
                    newEvent = cr.insert(Uri.parse("content://com.android.calendar/events"), cv);
                else
                    newEvent = cr.insert(Uri.parse("content://calendar/events"), cv);
 
                if (newEvent != null) {
                    long id = Long.parseLong( newEvent.getLastPathSegment() );
                    ContentValues values = new ContentValues();
                    values.put( "event_id", id );
                    values.put( "method", 1 );
                    values.put( "minutes", 15 ); // 15 minutes
                    if (Integer.parseInt(Build.VERSION.SDK) >= 8 )
                        cr.insert( Uri.parse( "content://com.android.calendar/reminders" ), values );
                    else
                        cr.insert( Uri.parse( "content://calendar/reminders" ), values );
 
                }
                dialog.cancel();
            }
 
        });
 
        builder.create().show();
    }
    cursor.close();
}

I'm sorry, but how may I generate my own Uri.parse content://com.android.calendar/calendars? May I add events to show on android devices using this code?

Thanks in advance Vekexasia!