在 Flutter 中使用 GetX 使用 Image Picker 和 Cropper 后如何显示图像？

如何解决在 Flutter 中使用 GetX 使用 Image Picker 和 Cropper 后如何显示图像？

我使用 GetX 获取图像裁剪后的路径并将其存储在一页上的 RXString 中：

RxString imageAdd = '$imagePath'.obs;

然后我使用以下方法在另一个页面上检索图像的路径：

Obx(
    () => Image(
 image: AssetImage(
(pollImageController.imageAdd.value)),

但是图像没有显示在第二页上。 完整代码：

ImagePickerCropper Page:
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:justpoll/Constants.dart';
import 'package:image_cropper/image_cropper.dart';
import 'package:image_picker/image_picker.dart';
import 'dart:io';
import 'package:justpoll/screens/create_poll/create_poll4.dart';

String imagePath;

class CreatePoll3 extends StatefulWidget {
  @override
  _CreatePoll3State createState() => _CreatePoll3State();
}

class _CreatePoll3State extends State<CreatePoll3> {
  final controller = Get.put(PollImageController());
  File _selectedFile;
  bool _inProcess = false;
  final _picker = ImagePicker();

  Widget getImageWidget() {
    if (_selectedFile != null) {
      return Image.file(
        _selectedFile,width: 370,height: 230,fit: BoxFit.cover,);
    } else {
      return Padding(
        padding: const EdgeInsets.only(bottom: 20),child: Image.asset(
          "assets/Images/placeholder.png",),);
    }
  }

  getImage(ImageSource source) async {
    this.setState(() {
      _inProcess = true;
    });
    PickedFile image = await _picker.getImage(source: source);

    if (image != null) {
      File cropped = await ImageCropper.cropImage(
          sourcePath: image.path,aspectRatio: CropAspectRatio(ratioX: 2,ratioY: 1.5),compressQuality: 100,maxWidth: 700,maxHeight: 700,compressFormat: ImageCompressFormat.jpg,androidUiSettings: AndroidUiSettings(
            toolbarColor: Colors.white,toolbarTitle: "Crop Image",statusBarColor: Colors.black,backgroundColor: Colors.white,));

      imagePath = cropped.path;
      print(imagePath);

      this.setState(() {
        _selectedFile = cropped;
        _inProcess = false;
      });
    } else {
      this.setState(() {
        _inProcess = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Scaffold(
        backgroundColor: MyColors.white,appBar: AppBar(
          title: Padding(
            padding: const EdgeInsets.all(75.0),child: Text('New Poll'),leading: GestureDetector(
            onTap: () {
              Navigator.pop(context);
            },child: Icon(
              Icons.arrow_back,backgroundColor: Colors.black87,body: ListView(
          children: [
            Column(
              children: [
                Center(
                  child: Padding(
                    padding: const EdgeInsets.only(top: 18,bottom: 28),child: Text("3/4"),// Padding(

                //   padding: const EdgeInsets.only(right: 230.0,top: 30,bottom: 30),//   child: Text(

                //     "Add Image",//     style: TextType.regularDarkText,//   ),// ),getImageWidget(),Padding(
                  padding: const EdgeInsets.only(top: 20),child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceEvenly,children: <Widget>[
                      MaterialButton(
                        onPressed: () {
                          getImage(ImageSource.camera);
                        },color: Colors.black,textColor: Colors.white,child: Icon(
                          Icons.camera,size: 24,padding: EdgeInsets.all(16),shape: CircleBorder(),MaterialButton(
                        onPressed: () {
                          getImage(ImageSource.gallery);
                        },child: Icon(
                          Icons.photo_album,Align(
                        alignment: Alignment.bottomRight,child: MaterialButton(
                          onPressed: () {
                            Navigator.push(
                              context,MaterialPageRoute(
                                builder: (context) => CreatePoll4(),);
                          },child: Icon(
                            Icons.arrow_forward,)
                    ],(_inProcess)
                    ? Container(
                        color: Colors.white,height: MediaQuery.of(context).size.height * 0.95,child: Center(
                          child: CircularProgressIndicator(),)
                    : Center()
              ],],);
  }
}

class PollImageController extends GetxController {
  RxString imageAdd = '$imagePath'.obs;
  // adding .obs makes this a stream based observable String

// this onInit override can be used instead of initState in a stateful widget.
// All text editing controllers can be initialized here
  @override
  void onInit() {
    super.onInit();
  }

  @override
  void onClose() {
    super.onClose();
  }
}

图像显示页面：

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:justpoll/Constants.dart';
import 'package:justpoll/screens/home_page/nav.dart';
import 'create_poll1_static.dart';
import 'create_poll3.dart';

final pollDataController = Get.find<PollDataController>();
final pollImageController = Get.find<PollImageController>();

// final _questionController = pollDataController.questionController;

class CreatePoll4 extends StatefulWidget {
  @override
  _CreatePoll4State createState() => _CreatePoll4State();
}

class _CreatePoll4State extends State<CreatePoll4> {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Scaffold(
        backgroundColor: MyColors.white,child: Text('Poll Preview'),child: Text("4/4"),Padding(
                  padding: const EdgeInsets.only(right: 240,top: 10),child: Text(
                    'Select Theme',style: TextType.regularDarkText,Padding(
                  padding: const EdgeInsets.only(top: 10),child: Row(
                    children: [
                      Expanded(
                        child: MaterialButton(
                          onPressed: () {},color: Colors.yellow,Expanded(
                        child: MaterialButton(
                          onPressed: () {},color: Colors.orange,color: Colors.brown,color: Colors.blue,color: Colors.green,Card(
                  child: Container(
                    color: Colors.blue,child: Padding(
                      padding: const EdgeInsets.only(bottom: 10),child: Column(
                        children: [
                          Row(
                            children: [
                              Padding(
                                padding: const EdgeInsets.all(8.0),child: CircleAvatar(
                                  backgroundImage:
                                      AssetImage('assets/Images/blackLogo.png'),Padding(
                                padding: const EdgeInsets.only(left: 10),child: Text('JustPoll'),Padding(
                            padding: const EdgeInsets.all(8.0),child: Obx(
                              () => Text(pollDataController.question.value),child: Obx(
                              () => Image(
                                image: AssetImage(
                                    (pollImageController.imageAdd.value)),height: 150,width: 200,Row(
                            children: [
                              Padding(
                                padding:
                                    const EdgeInsets.only(left: 120,top: 20),child: Obx(
                                  () => Text(pollDataController.op1.value),SizedBox(
                                width: 70,Padding(
                                padding:
                                    const EdgeInsets.only(left: 10,child: Obx(
                                  () => Text(pollDataController.op1Emoji.value),child: Obx(
                                  () => Text(pollDataController.op2.value),child: Obx(
                                  () => Text(pollDataController.op2Emoji.value),child: Obx(
                                  () => Text(pollDataController.op3.value),child: Obx(
                                  () => Text(pollDataController.op3Emoji.value),child: Obx(
                                  () => Text(pollDataController.op4.value),child: Obx(
                                  () => Text(pollDataController.op4Emoji.value),child: Align(
                    alignment: Alignment.bottomRight,child: MaterialButton(
                      onPressed: () {
                        Navigator.push(
                          context,MaterialPageRoute(
                            builder: (context) => Nav(),);
                      },child: Icon(
                        Icons.done,)
              ],);
  }
}