Flutter

Question

我的图像选择器在我的真实设备的调试模式下在模拟器 7 中工作正常，但在我的真实设备中导出应用程序后无法工作..

我正在使用这个plugin

在调试中一切正常：

video in google drive 如您所见，在调试模式下一切正常

这是我的图像选择功能

 File userAvatar;
 File get getUserAvatar => userAvatar;
 Future pickUserAvatar(BuildContext context, ImageSource source) async {
    final pickedUserAvatar = await picker.getImage(source: source);
    BotToast.showText(text: 'my picked name is $source');
    pickedUserAvatar == null
        ? BotToast.showText(text: 'Select Image')
        : userAvatar = File(pickedUserAvatar.path);

    userAvatar != null
        ? Provider.of<LandingService>(context, listen: false)
            .showUserAvatar(context)
        : BotToast.showText(text: 'Image Upload Error');

    notifyListeners();
  }

这是我的show user头像功能我在图片成功选取后显示的地方

  showUserAvatar(BuildContext context) {
    return showModalBottomSheet(
        context: context,
        builder: (context) {
          return Container(
            height: MediaQuery.of(context).size.height * 0.45,
            width: MediaQuery.of(context).size.width,
            child: SingleChildScrollView(
              child: Column(
                children: [
                  Padding(
                    padding: EdgeInsets.symmetric(horizontal: 150.0),
                    child: Divider(
                      thickness: 4.0,
                      color: constantColors.whiteColor,
                    ),
                  ),
                  CircleAvatar(
                    radius: 80.0,
                    backgroundColor: constantColors.transperant,
                    backgroundImage: FileImage(
                      Provider.of<LandingUtils>(context, listen: false)
                          .userAvatar,
                    ),
                  ),
                  Container(
                    child: Row(
                      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                      children: [
                        MaterialButton(
                          child: Text(
                            'Reselect',
                            style: TextStyle(
                              color: constantColors.whiteColor,
                              fontWeight: FontWeight.bold,
                              decoration: TextDecoration.underline,
                              decorationColor: constantColors.whiteColor,
                            ),
                          ),
                          onPressed: () {
                            Provider.of<LandingUtils>(context, listen: false)
                                .pickUserAvatar(context, ImageSource.gallery);
                          },
                        ),
                        MaterialButton(
                          color: constantColors.blueColor,
                          child: Text(
                            'Confirm Image',
                            style: TextStyle(
                              color: constantColors.whiteColor,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                          onPressed: () {
                            Provider.of<FirebasessOperations>(context,
                                    listen: false)
                                .uploadUserAvatar(context)
                                .whenComplete(() => {
                                      signUpSheet(context),
                                    });
                          },
                        )
                      ],
                    ),
                  )
                ],
              ),
            ),
            decoration: BoxDecoration(
              color: constantColors.blueGreyColor,
              borderRadius: BorderRadius.circular(15.0),
            ),
          );
        });
  }

我也在我的 android 清单中添加了这一行

android:requestLegacyExternalStorage="true"

Answer 1

您需要先检查并授予用户权限，然后再执行照片选择功能请看看这个插件：https://pub.dev/packages/permission_handler 示例：

// request a user for permission first 
Map<Permission, PermissionStatus> statuses = await [
  Permission.storage,
  Permission.camera,
].request();

 if (await Permission.storage.request().isGranted) {
   // Either the permission was already granted before or the user just granted it you 
   can now select photo.
 }

Answer 2

问题是您的构建 Gradle 版本转到 android/build.grale

classpath 'com.android.tools.build:gradle:3.5.4'

希望有用，

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