LateInitializationError：field＆＃x27; _recognition@25356196＆＃x27;尚未初始化

Question

每当我运行颤音代码时，我都会不断出现错误。下面的代码是我从中得到问题的飞镖文件。我尝试调试，但无法得到答案，并且该项目延迟了我，因为我仍然有一些未完成的项目。我希望我能得到这个错误的答案。

错误是另一个例外：lateinitializationError：field'_recognition@25356196'没有 被初始化。谢谢。

import 'package:flutter/material.dart';
import 'bounding_box.dart';
import 'camera.dart';
import 'dart:math' as math;
import 'package:tflite/tflite.dart';

// ignore: must_be_immutable
class LiveFeed extends StatefulWidget {
   List<CameraDescription> cameras;
  // ignore: use_key_in_widget_constructors
   LiveFeed(this.cameras);
  @override
  // ignore: library_private_types_in_public_api
  _LiveFeedState createState() => _LiveFeedState();
}

class _LiveFeedState extends State<LiveFeed> {
  late List<dynamic> _recognitions;
  int _imageHeight = 0;
  int _imageWidth = 0;
  initCameras() async {

  }
  loadTfModel() async {
    await Tflite.loadModel(
      model: "assets/models/ssd_mobilenet.tflite",
      labels: "assets/models/labels.txt",
    );
  }
  /* 
  The set recognitions function assigns the values of recognitions, imageHeight and width to the variables defined here as callback
  */
  setRecognitions(recognitions, imageHeight, imageWidth) {
    setState(() {
      _recognitions = recognitions;
      _imageHeight = imageHeight;
      _imageWidth = imageWidth;
    });
  }

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

  @override
  Widget build(BuildContext context) {
    Size screen = MediaQuery.of(context).size;
    return Scaffold(
      appBar: AppBar(
        title: const Text("Orange AI"),
      ),
      body: Stack(
        children: <Widget>[
          CameraFeed(widget.cameras, setRecognitions),
          BoundingBox(
            // ignore: unnecessary_null_comparison
            _recognitions,
            math.max(_imageHeight, _imageWidth),
            math.min(_imageHeight, _imageWidth),
            screen.height,
            screen.width,
          ),
        ],
      ),
    );
  }
}

我的航站楼

Another exception was thrown: LateInitializationError: Field '_recognitions@25356196' has not
been initialized.```

Answer 1

您尚未初始化晚列表＆lt; dynamic＆gt; _recognitions;和最简单的解决方案是删除late并用空列表初始化它。

List<dynamic> _recognitions = [];

如果您不删除late，请确保已在build上使用它之前已将其初始化。您可以在initstate上初始化它。