「小程式JAVA實戰」小程式視訊播放的時候生命周期的控制（56）

當播放單個視訊時，點選搜尋，視訊還在背景繼續播放，這是有問題，需要通過生命周期的方式來控制，當跳轉頁面時，視訊暫停播放，視訊傳回後繼續播放。源碼https://github.com/limingios/wxProgram.git 中No.15

官網js的方式控制視訊

• VideoContext

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

• 代碼實作

給video增加id，然後onload擷取VideoContext，onshow進行play，onHide進行pause。

videoInfo.wxml

<view style='width:100%;height:100%'>
  <video id="myVideo" src="http://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'>
            <!-- 上傳視訊 -->

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


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

        </cover-view>


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


            <!-- 喜歡收藏按鈕 -->
            <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>


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

            <!-- 分享按鈕 -->
            <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'>
            <!-- 首頁按鈕 -->
            <cover-image class='' src='../../resource/images/index.png' class="size-bottom" bindtap='showIndex'></cover-image>



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

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

複制

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();
  }
})           

複制

PS：小程式開發很類似app開發，了解生命周期，可以很友善的完成一些功能的開發。