「小程序JAVA实战」小程序视频播放的时候生命周期的控制（56）

当播放单个视频时，点击搜索，视频还在后台继续播放，这是有问题，需要通过生命周期的方式来控制，当跳转页面时，视频暂停播放，视频返回后继续播放。源码https://github.com/limingios/wxProgram.git 中No.15

官网js的方式控制视频

• VideoContext
  >https://developers.weixin.qq.com/miniprogram/dev/api/media/video/VideoContext.html

• 代码实现
  >给video增加id，然后onload获取VideoContext，onshow进行play，onHide进行pause。

videoInfo.wxml

<view style='width:100%;height:100%'>
  <video id="myVideo" class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="https://127.0.0.1:8081/180831CF2TS25MNC/4e0ca373-6520-45b9-a1a6-7ee8429dc5d8.mp4" muted='{{false}}' controls='{{false}}' autoplay='{{true}}' loop='{{true}}' enable-progress-gesture='{{false}}'
  style='width:100%;height:100%;'
  objectFit='{{cover}}'
  >

  <cover-view class='container'>
            <!-- 上传视频 -->

            <cover-image src='../../resource/images/camera.png' style='width:50rpx;height:50rpx;' bindtap='upload'></cover-image>


            <!-- 搜索按钮 -->
            <cover-image src='../../resource/images/search.png' style='width:45rpx;height:45rpx;' bindtap='showSearch'></cover-image>

        </cover-view>


<cover-view class='container-me'>
            <!-- 头像 -->
            <cover-image class="face" src='{{serverUrl}}{{publisher.faceImage}}' bindtap='showPublisher'></cover-image>


            <!-- 喜欢收藏按钮 -->
            <block wx:if="{{userLikeVideo}}">
                <cover-image class="size-me" src='../../resource/images/like.png' style='margin-top:30rpx;' bindtap='likeVideoOrNot'></cover-image>
            </block>
            <block wx:else>
                <cover-image class="size-me" src='  ../../resource/images/unlike.png' style='margin-top:30rpx;' bindtap='likeVideoOrNot'></cover-image>
            </block>


            <!-- 评论按钮 -->
            <cover-image class="size-me" src='../../resource/images/comments.png' style='margin-top:30rpx;' bindtap='leaveComment'></cover-image>

            <!-- 分享按钮 -->
            <cover-image class="size-me" src='../../resource/images/share.png' style='margin-top:30rpx;' bindtap='shareMe'></cover-image>

        </cover-view>

      <cover-view class='container-words'>

            <cover-view>@{{publisher.nickname}}</cover-view>

            <cover-view class='video-desc'>{{videoInfo.videoDesc}}</cover-view>



        </cover-view>

        <cover-view class='container-bottom'>
            <!-- 首页按钮 -->
            <cover-image class='' src='../../resource/images/index.png' class="size-bottom" bindtap='showIndex'></cover-image>



            <!-- 我的按钮 -->
            <cover-image class='' src='../../resource/images/mine.png' class="size-bottom" bindtap='showMine'></cover-image>

        </cover-view>
  </video>
</view>

videoInfo.js

Page({

  data: {
    cover:'cover',
    videoContext:""
  },
  showSearch:function(){
    wx.navigateTo({
      url: '../videoSearch/videoSearch',
    })
  },
  onLoad:function(){
    var me = this;
    me.videoContext = wx.createVideoContext('myVideo', me);

  },
  onShow:function(){
    var me = this;
    me.videoContext.play();
  },
  onHide:function(){
    var me = this;
    me.videoContext.pause();
  }
})

PS：小程序开发很类似app开发，了解生命周期，可以很方便的完成一些功能的开发。