SQLite Database does't update listview item and inserts new instead

When item of listview is clicked, it gets opened in another activity which has edittext. After editing an item, when I save it, item does not get updated in the listview but it inserts a new entry in listview.

How can I update existing item without inserting new?

Here is my code

Activity: TRList.class

lv = (ListView)findViewById(R.id.tbr_list);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
            Intent intent = new Intent(TRList.this, TRTimeReminder.class);
            intent.putExtra("remId", (int)id);
            startActivity(intent);
        }
});

When listView item is clicked, it opens another activity

TRTimeReminder.class I have set save button in menu

case R.id.menu_tbr_done:
            String title = edTitle.getText().toString();
            String des = edDes.getText().toString();
            String time = timeView.getText().toString();
            String date = dateView.getText().toString();

            Bundle extras = getIntent().getExtras();
            if(extras != null) {
                int value = extras.getInt("remId");
                if (value > 0) {
                    trDb.updateReminder(new TRListFormat(value, title, des, date, time));
                }
            }
            else{
                trDb.addReminder(new TRListFormat(title, des, date, time));
            }

            Intent i = new Intent(getApplicationContext(), TRList.class);
            startActivity(i);

            edTitle.getText().clear();
            edDes.getText().clear();
            dateView.setText(currDate);
            timeView.setText(currTime);

            return true;

TRDBHelper.class

//Add new reminder
void addReminder(TRListFormat format){

    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(COLUMN_TITLE, format.getTitle());
    values.put(COLUMN_DES, format.getDes());
    values.put(COLUMN_DATE, format.getDate());
    values.put(COLUMN_TIME, format.getTime());

    db.insert(TABLE_NAME, null, values);
    db.close();
}

//Update single reminder
public void updateReminder(TRListFormat format){

    SQLiteDatabase db = this.getWritableDatabase();

    int id = format.getId();

    ContentValues values = new ContentValues();
    values.put(COLUMN_ID, format.getId());
    values.put(COLUMN_TITLE, format.getTitle());
    values.put(COLUMN_DES, format.getDes());
    values.put(COLUMN_DATE, format.getDate());
    values.put(COLUMN_TIME, format.getTime());

    db.update(TABLE_NAME, values, COLUMN_ID+ " = " +id, null);
    db.close();
}