小编Muh*_*min的帖子

我想发布我的应用程序，但遇到了这个问题

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:validateSigningRelease'.
> Keystore file 'D:\FlutterProjects\Panaszok\02012020 - Copy (2) - Copy\Multi Restaurants Flutter App\android\app\key\panaszok.jks' not found for signing config 'release'.

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 23s
Running Gradle task 'assembleRelease'...                           23.9s
Gradle task …

我在我的应用程序中使用 multi_image_picker 4.6.1 但我遇到了一些问题。如何在页面上的特定位置组织图像，并在每个选定的图像上放置取消按钮，以便用户可以一张一张地取消或删除选定的图像，如下图所示。提前致谢

这是我正在使用的代码

import 'package:flutter/material.dart';
import 'dart:async';

import 'package:multi_image_picker/multi_image_picker.dart';

void main() => runApp(new MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  List<Asset> images = List<Asset>();
  String _error = 'No Error Dectected';

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

  Widget buildGridView() {
    return GridView.count(
      crossAxisCount: 3,
      children: List.generate(images.length, (index) {
        Asset asset = images[index];
        return AssetThumb(
          asset: asset,
          width: 300,
          height: 300,
        );
      }),
    );
  }

  Future<void> loadAssets() …