Flutter实现仿微信分享功能的示例代码-移动开发

Flutter用来快速开发AndroidiOS平台应用，在Flutter中，通过fluwx或者fluwx_no_pay插件可以实现微信分享功能，本文将具体介绍实现的示例代码，需要的可以参考一下

1.首先去pub官网

https://pub.flutter-io.cn/

查找这两个包

fluwx_no_pay

或者

fluwx

安装方式有两种：

方法一：

flutter pub add fluwx_no_pay

方法二：

dependencies:
  fluwx_no_pay: ^3.6.1+5

然后在使用的时候导入

import 'package:fluwx_no_pay/fluwx_no_pay.dart';

虽然它集成的功能很多

但是我们只做分享的演示

2 在微信开放平台注册开发者账号以及创建你的应用程序

微信开放平台链接

开发平台文档

创建应用填写基本的应用信息后，提交微信平台审核，审核通过后

从这里拿到 AppID ，然后再将配置的 iOS 平台的 Universal Links 拿过来，至于如何获取，请查看相关资料。

3 在分享页面

3.1 初始化

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

  Future _initFluwx() async {

    await WxSdk.init();

  }

3.2 检测微信是否安装

如点击按钮时进行分享，分享前检查一下

  bool _wxIsInstalled = false;  
  void _checkWx() async {
    _wxIsInstalled = await WxSdk.wxIsInstalled();
    refreshUI();
  }

3.3 分享微信消息

 String imagePath;

imagePath = await LocalImageCache.instance
          .download(context, widget.cjinfo.cover, ext: ".jpg");
//压缩图片，我这儿用的flutter_image_compress

                          Uint8List image =
                              await FlutterImageCompress.compressWithFile(
                            imagePath,
                            minHeight: 128,
                            minWidth: 128,
                            quality: 20,
                            // rotate: 135,
                          );

                         WxSdk.ShareUrl(
                                  //分享链接
                                  "你的链接",
                                  scene: 1,
                                  thumbFile: imagePath,
                                  desc: "描述",
                                  title: "标题",
                                );

封装的工具类

import 'dart:io';
import 'dart:typed_data';
import 'check.dart';
import 'package:fluwx_no_pay/fluwx_no_pay.dart' as fluwx;


class WxSdk {
  // static bool wxIsInstalled;
  static Future init() async {
    fluwx.registerWxApi(
        appId: "你的appid",
        doOnAndroid: true,
        doOnIOS: true,
        universalLink: "你的universalLink");
  
  }

  static Future<bool> wxIsInstalled() async {
    return await fluwx.isWeChatInstalled;
  }



  /**
   * 分享图片到微信，
   * file=本地路径
   * url=网络地址
   * asset=内置在app的资源图片
   * scene=分享场景，1好友会话，2朋友圈，3收藏
   */
  static void ShareImage(
      {String title,
      String decs,
      String file,
      String url,
      String asset,
      int scene = 1}) async {
    fluwx.WeChatScene wxScene = fluwx.WeChatScene.SESSION;
    if (scene == 2) {
      wxScene = fluwx.WeChatScene.TIMELINE;
    } else if (scene == 3) {
      wxScene = fluwx.WeChatScene.FAVORITE;
    }
    fluwx.WeChatShareImageModel model = null;

    if (file != null) {
      model = fluwx.WeChatShareImageModel(fluwx.WeChatImage.file(File(file)),
          title: title, description: decs, scene: wxScene);
    } else if (url != null) {
      model = fluwx.WeChatShareImageModel(fluwx.WeChatImage.network(url),
          title: title, description: decs, scene: wxScene);
    } else if (asset != null) {
      model = fluwx.WeChatShareImageModel(fluwx.WeChatImage.asset(asset),
          title: title, description: decs, scene: wxScene);
    } else {
      throw Exception("缺少图片资源信息");
    }
    fluwx.shareToWeChat(model);
  }

  /**
   * 分享文本
   * content=分享内容
   * scene=分享场景，1好友会话，2朋友圈，3收藏
   */
  static void ShareText(String content, {String title, int scene = 1}) {
    fluwx.WeChatScene wxScene = fluwx.WeChatScene.SESSION;
    if (scene == 2) {
      wxScene = fluwx.WeChatScene.TIMELINE;
    } else if (scene == 3) {
      wxScene = fluwx.WeChatScene.FAVORITE;
    }
    fluwx.WeChatShareTextModel model =
        fluwx.WeChatShareTextModel(content, title: title, scene: wxScene);
    fluwx.shareToWeChat(model);
  }

/***
 * 分享视频
 * videoUrl=视频网上地址
 * thumbFile=缩略图本地路径
   * scene=分享场景，1好友会话，2朋友圈，3收藏
 */
  static void ShareVideo(String videoUrl,
      {String thumbFile, String title, String desc, int scene = 1}) {
    fluwx.WeChatScene wxScene = fluwx.WeChatScene.SESSION;
    if (scene == 2) {
      wxScene = fluwx.WeChatScene.TIMELINE;
    } else if (scene == 3) {
      wxScene = fluwx.WeChatScene.FAVORITE;
    }
    fluwx.WeChatImage image = null;
    if (thumbFile != null) {
      image = fluwx.WeChatImage.file(File(thumbFile));
    }
    var model = fluwx.WeChatShareVideoModel(
        videoUrl: videoUrl,
        thumbnail: image,
        title: title,
        description: desc,
        scene: wxScene);
    fluwx.shareToWeChat(model);
  }

  /**
   * 分享链接
   * url=链接
   * thumbFile=缩略图本地路径
   * scene=分享场景，1好友会话，2朋友圈，3收藏
   */
  static void ShareUrl(String url,
      {String thumbFile,
      Uint8List thumbBytes,
      String title,
      String desc,
      int scene = 1,
      String networkThumb,
      String assetThumb}) {
    desc = desc ?? "";
    title = title ?? "";
    if (desc.length > 54) {
      desc = desc.substring(0, 54) + "...";
    }
    if (title.length > 20) {
      title = title.substring(0, 20) + "...";
    }
    fluwx.WeChatScene wxScene = fluwx.WeChatScene.SESSION;
    if (scene == 2) {
      wxScene = fluwx.WeChatScene.TIMELINE;
    } else if (scene == 3) {
      wxScene = fluwx.WeChatScene.FAVORITE;
    }
    fluwx.WeChatImage image = null;
    if (thumbFile != null) {
      image = fluwx.WeChatImage.file(File(thumbFile));
    } else if (thumbBytes != null) {
      image = fluwx.WeChatImage.binary(thumbBytes);
    } else if (strNoEmpty(networkThumb)) {
      image = fluwx.WeChatImage.network(Uri.encodeFull(networkThumb));
    } else if (strNoEmpty(assetThumb)) {
      image = fluwx.WeChatImage.asset(assetThumb, suffix: ".png");
    }
    var model = fluwx.WeChatShareWebPageModel(
      url,
      thumbnail: image,
      title: title,
      description: desc,
      scene: wxScene,
    );
    fluwx.shareToWeChat(model);
  }
}

check.dart

/// 字符串不为空
bool strNoEmpty(String value) {
  if (value == null) return false;

  return value.trim().isNotEmpty;
}

/// 字符串不为空
bool mapNoEmpty(Map value) {
  if (value == null) return false;
  return value.isNotEmpty;
}

///判断List是否为空
bool listNoEmpty(List list) {
  if (list == null) return false;

  if (list.length == 0) return false;

  return true;
}

//下载图片

import 'dart:convert';
import 'dart:io';
import 'dart:typed_data';
import 'package:dio/dio.dart';
import 'package:flutter/cupertino.dart';
import 'package:path_provider/path_provider.dart';

class LocalImageCache {
  static LocalImageCache instance = LocalImageCache();
  String _tmepPath = "";
  void init() async {
    var tempDir = await getTemporaryDirectory();
    _tmepPath = tempDir.path;
  }


/**
 * 直接下载图片到本地临时目录
 * ios必须带有后缀，不然exists会永远=false
 */
 

  Future<String> download(BuildContext context, String url,{String ext = ""}) async {
    try {
      var dio = await Dio()
          .get(url, options: Options(responseType: ResponseType.bytes));
      Uint8List image = Uint8List.fromList(dio.data);
      
      return save(image, url,ext: ext);
    } catch (ex) {
      print("image download error:${ex.toString()}");
      return null;
    }
  }

  
}