Where to call finish()?

I am saving an event. When I click on save I want to check if title is not null and start time equals end time and dose event overlap and then save the event.

I have a boolean variable to check if edit mode is true. If it is true I want to update the existing event.

Now I tried to do this but when I am saving the event I want to check all these scenario and show the snackbar and then finish the activity.

1) But now the activity get finishes as soon as I click on save.

2) Also When I want to update it shows event exists.

What's wrong here?

  save.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            eventTitle = title.getText().toString();
            location = mAutocompleteView.getText().toString();


            if (eventTitle.length() == 0) {

                showAlert("Title can not be empty.");

            }
            else if (startTime.equals(endTime)) {
                showAlert("End Time can not be same as Start Time.");
            }

            else if (db.doesEventOverlap(startTime,endTime,dayOfWeek)) {

               showAlert("Event Exists");

            }

            else {

                if (editMode) {

                eventData.setTitle(title.getText().toString());
                eventData.setFromDate(fromDate);
                eventData.setToDate(toDate);
                eventData.setDayOfWeek(selectDay.getText().toString());
                eventData.setLocation(mAutocompleteView.getText().toString());
                eventData.setNotificationTime(notificationTime);

                    db.updateEvent(eventData);

                    Toast.makeText(getApplicationContext(),"Event Updated",Toast.LENGTH_SHORT).show();
                }

               else {
                        db.addEvent(new EventData(eventTitle, startTime, endTime, dayOfWeek, location, notificationTime, mColor));
                        showAlert("Event Added.");
                }

                setResult(RESULT_OK, i);
                finish();
            }
        }
    });

dose event overlap function :

     boolean doesEventOverlap(String startTime, String endTime, String day) {
    String selectQuery = "SELECT COUNT(*) FROM " + TABLE + " WHERE " + KEY_DAY_OF_WEEK + " = '" + day + "'" + " AND "

            + "(" + KEY_FROM_DATE + " < '" + startTime
            + "' AND '" + startTime + "' < " + KEY_TO_DATE + ") OR "

            + " (" + KEY_FROM_DATE + " < '" + endTime
            + "' AND '" + endTime + "' < " + KEY_TO_DATE + ") OR "

            + " (" + KEY_FROM_DATE + " < '" + startTime
            + "' AND '" + endTime + "' < " + KEY_TO_DATE + ") OR "

            + " ('" + startTime + "' < " + KEY_FROM_DATE
            + " AND " + KEY_TO_DATE + " < '" + endTime + "')";


    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);

    if (cursor.moveToFirst()) {
        do {
            EventData event = new EventData();
            return cursor.getInt(0) > 0;
        } while (cursor.moveToNext());
    }
    return false;
}

create table

  public void createTable(SQLiteDatabase db){
    String CREATE_EVENTS_TABLE = "CREATE TABLE " + TABLE_EVENTS + "("
            + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
            + KEY_TITLE + " TEXT,"
            + KEY_FROM_DATE + " DATE,"
            + KEY_TO_DATE + " DATE,"
            + KEY_DAY_OF_WEEK + " TEXT,"
            + KEY_LOCATION + " TEXT,"
            + KEY_NOTIFICATION_TIME + " DATE,"
            + KEY_COLOR + " TEXT" + ")";

    db.execSQL(CREATE_EVENTS_TABLE);
}

Thank you..