OpenMediacenterMobileFlutter/lib/navigation/settings_screen.dart

import 'package:flutter/material.dart';

import '../db/database.dart';

class SettingsScreen extends StatefulWidget {
  const SettingsScreen({Key? key}) : super(key: key);

  @override
  State<SettingsScreen> createState() => _SettingsScreenState();
}

class _SettingsScreenState extends State<SettingsScreen> {
  int dbsize = 0;

  @override
  void initState() {
    super.initState();
    loadDBSize();
  }

  void loadDBSize() async {
    final int cnt = (await Db().db().rawQuery("pragma page_count;"))[0]
        ["page_count"] as int;
    final int pagesize =
        (await Db().db().rawQuery("pragma page_size;"))[0]["page_size"] as int;
    setState(() {
      dbsize = cnt * pagesize;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        ElevatedButton(
            onPressed: () async {
              await Db().db().delete("previews");
              // shrink the db file size
              await Db().db().execute("VACUUM");
              loadDBSize();
            },
            child: const Text("Delete cache!")),
        Text("db size: ${dbsize / 1024} kb")
      ],
    );
  }
}