Flutter ListView builder 未使用新数据更新

因为你在对话框中放了ListView.builder，所以它会创建一个新的堆栈，而一个新的堆栈不能从另一个堆栈重新渲染

您可以通过为对话框创建新的有状态小部件来更改代码

import 'package:flutter/material.dart';

import '../database/LocalDatabase.dart';
import '../model/Player.dart';

class Pitch extends StatefulWidget {
  const Pitch({super.key});

  @override
  _Pitch createState() => _Pitch();
}

class _Pitch extends State<Pitch> { 

  Offset positionOne = const Offset(100, 100);
  Offset positionTwo = const Offset(200, 100);

  @override
  Widget build(BuildContext context) {
    return Container(
      constraints: BoxConstraints.expand(),
      color: Colors.white,
      child: Stack(
        alignment: Alignment.center,
        children: [
          Image.asset("assets/images/pitch.png"),
          Positioned(
            left: positionOne.dx,
            top: positionOne.dy,
            child: Draggable(
              feedback: playerImage(
                  "https://cdn.sofifa.net/players/158/023/22_120.png"),
              childWhenDragging: Opacity(
                opacity: 0,
                child: playerImage(
                    "https://cdn.sofifa.net/players/158/023/22_120.png"),
              ),
              child: playerImage(
                  "https://cdn.sofifa.net/players/158/023/22_120.png"),
              onDragEnd: (details) {
                setState(() {
                  positionOne = details.offset;
                });
              },
            ),
          ),
          Positioned(
            left: positionTwo.dx,
            top: positionTwo.dy,
            child: Draggable(
              feedback: playerImage(
                  "https://cdn.sofifa.com/players/notfound_0_120.png"),
              childWhenDragging: Opacity(
                opacity: 0,
                child: playerImage(
                    "https://cdn.sofifa.com/players/notfound_0_120.png"),
              ),
              child: playerImage(
                  "https://cdn.sofifa.com/players/notfound_0_120.png"),
              onDragEnd: (details) {
                setState(() {
                  positionTwo = details.offset;
                });
              },
            ),
          )
        ],
      ),
    );
  }

  Widget playerImage(String imageUrl) {
    return GestureDetector(
      onTap: () => showDialog<void>(
        context: context,
        builder: (BuildContext context) => Dialog(
          backgroundColor: Colors.white,
          child: const PlayersDialog(),
        ),
      ),
      child: SizedBox(
        width: 48,
        height: 48,
        child: Image.network(imageUrl),
      ),
    );
  }
 


}


class PlayersDialog extends StatefulWidget {
  const PlayersDialog({super.key});

  @override
  _PlayersDialog createState() => _PlayersDialog();

}

class _PlayersDialog extends State<PlayersDialog> {
  List<Player> playersList = <Player>[];

  Future<void> searchPlayers(String query) async {
    final database =
        await $FloorLocalDatabase.databaseBuilder('local_database.db').build();

    final playerDao = database.playerDao;

    // await List<Player> filteredPlayers =
    playerDao.searchPlayers(query).then((value) {
      setState(() => playersList = value);
      debugPrint(value[0].name);
    });
  }
  @override
  Widget build(BuildContext context) {
    return SizedBox(
            height: 300,
            width: 300,
            child: Column(
              children: [
                const SizedBox(height: 24),
                Container(
                    margin: const EdgeInsets.only(left: 16),
                    height: 48,
                    child: TextField(
                      decoration: const InputDecoration.collapsed(
                          hintText: 'Enter player name',
                          focusColor: Colors.transparent),
                      onChanged: (value) {
                        searchPlayers(value);
                      },
                    )),
                const SizedBox(height: 24),
                SizedBox(
                  height: 200,
                  child: ListView.builder(
                    itemCount: playersList.length,
                    itemBuilder: (context, index) {
                      return playerItem(playersList.elementAt(index));
                    },
                  ),
                ),
              ],
            ),
          );
  }

    Widget playerItem(Player? player) {
    return Container(
      height: 48,
      margin: const EdgeInsets.all(8),
      padding: const EdgeInsets.only(left: 8, right: 8),
      decoration: BoxDecoration(
          shape: BoxShape.rectangle,
          color: Colors.white,
          borderRadius: BorderRadius.circular(16),
          boxShadow: const [BoxShadow(blurRadius: 8)]),
      child: Row(
        children: [
          SizedBox(
              height: 36,
              width: 36,
              child: Image.network(player?.playerImageUrl ?? "")),
          const SizedBox(width: 8),
          Text(player?.name ?? "")
        ],
      ),
    );
  }

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

    // getPlayers().then((value) {
    //   debugPrint("playerfromdb: ${value[0].name}");
    // });
  }

  Future<List<Player>> getPlayers() async {
    final database =
        await $FloorLocalDatabase.databaseBuilder('local_database.db').build();

    final playerDao = database.playerDao;

    final players = playerDao.getAllPlayers();

    return players;
  }

}