When to close db connection on android? Every time after your operation finished or after your app exit

Question

I have an android application that access local sqlite3 db frequently, for performance consideration so i always keep the connection open. But one of my friends recommended

Answer 1

The documentation says the connection can be open as long as you need it. And can be closed in onDestroy() method. Documentation link

Persisting Database Connection:

Since getWritableDatabase() and getReadableDatabase() are expensive to call when the database is closed, you should leave your database connection open for as long as you possibly need to access it. Typically, it is optimal to close the database in the onDestroy() of the calling Activity.

    @Override
    protected void onDestroy() {
        mDbHelper.close();
        super.onDestroy();
    }