HarmonyOS NEXT实战：通过微信分享内容

HarmonyOS Next实战##三方SDK##教育

前提条件：已接入微信SDK

参考资料：
https://developers.weixin.qq.com/doc/oplatform/Mobile_App/Share_and_Favorites/ohos.html

为什么要通过微信分享内容？
通过微信分享内容具有多方面显著的好处，以下从传播效果维度展开详细分析：

• 覆盖面广：微信拥有庞大的用户基数，截至目前月活跃用户数超13亿。当你分享内容到微信时，你的好友、好友的好友（通过转发）都有可能看到，能迅速将信息扩散到大量潜在受众面前。例如，一篇优质的科普文章在微信朋友圈分享后，经过多级转发，可能在短时间内获得数万甚至数十万的阅读量，大大拓宽了内容的传播范围。
• 精准触达：微信是基于社交关系建立的平台，分享的内容会优先推送给你的微信好友和关注的公众号粉丝。这些人与你存在一定的社交关联或兴趣共鸣，对分享内容的接受度相对较高。比如，你是一位摄影爱好者，在微信群分享摄影技巧和作品，群里的摄影同好们会更感兴趣，能更精准地触达目标受众。
• 传播速度快：微信的信息传播具有即时性，一旦分享内容，好友可以立即看到。而且，通过朋友圈、微信群等渠道，内容可以在短时间内被大量转发和传播，形成病毒式传播效应。例如，一条有趣的搞笑视频在微信上分享后，可能几分钟内就被转发到多个群和朋友圈，迅速在网络上传播开来。

以下为通过微信分享内容的鸿蒙项目代码实战：
添加WeixinUtil

import {
    GlobalKey, GlobalUtil, Logger } from "@heduohao/bases";
import {
    bundleManager } from "@kit.AbilityKit";
import {
    BusinessError } from "@kit.BasicServicesKit";
import {
    WXApi } from "../sdk/weixin/WXApi";
import * as wxopensdk from '@tencent/wechat_open_sdk';
import {
    common } from "@kit.AbilityKit";
import {
    image } from "@kit.ImageKit";

export class WeixinUtil {
   
  /**
   * 判断是否已安装微信
   * @returns
   */
  static isInstalled() {
   
    const isInstalled = WXApi.isWXAppInstalled()
    return isInstalled
  }

  /**
   * 判断是否已安装微信
   */
  static isInstalled_old() {
   
    try {
   
      let canOpen = bundleManager.canOpenLink('weixin://');
      Logger.info(`WeixinUtil.IsInstalled = ${
     JSON.stringify(canOpen)}`);
      return true
    } catch (err) {
   
      let message = (err as BusinessError).message;
      Logger.error(`WeixinUtil.IsInstalled failed, err = ${
     message}`);
      return false
    }
  }

  /**
   * 分享文字
   * @param text
   */
  static shareText(text: string) {
   
    let textObject = new wxopensdk.WXTextObject()
    textObject.text = text
    let mediaMessage = new wxopensdk.WXMediaMessage()
    mediaMessage.mediaObject = textObject
    let req = new wxopensdk.SendMessageToWXReq()
    req.scene = wxopensdk.SendMessageToWXReq.WXSceneSession
    req.message = mediaMessage
    //获取UIAbilityContext
    const context = GlobalUtil.getObject(GlobalKey.UIAbilityContext) as common.UIAbilityContext;
    WXApi.sendReq(context, req)
  }

  /**
   * 分享网页内容
   * @param url
   * @param title
   * @param description
   * @param callbackAbility 微信跳回宿主App时拉起的ability名字，如果不填则默认是'EntryAbility'
   */
  static async shareWeb(url: string, title: string, description: string, callbackAbility: string = 'EntryAbility') {
   
    const webpageObject = new wxopensdk.WXWebpageObject()
    webpageObject.webpageUrl = url

    const mediaMessage = new wxopensdk.WXMediaMessage()
    mediaMessage.mediaObject = webpageObject
    mediaMessage.title = title
    mediaMessage.description = description

    //获取UIAbilityContext
    const context = GlobalUtil.getObject(GlobalKey.UIAbilityContext) as common.UIAbilityContext;
    const thumbData = await context.resourceManager.getMediaContent($rawfile('[bases].drawable-xxhdpi/ic_logo.png'))
    const thumbPixel = image.createImageSource(thumbData.buffer).createPixelMapSync()
    const thumbBuffer = await image.createImagePacker().packToData(thumbPixel, {
    format: "image/png", quality: 100 })
    mediaMessage.thumbData = new Uint8Array(thumbBuffer)

    const req = new wxopensdk.SendMessageToWXReq()
    req.callbackAbility = callbackAbility
    req.scene = wxopensdk.SendMessageToWXReq.WXSceneSession
    req.message = mediaMessage
    WXApi.sendReq(context, req)
  }
}