آموزش عملی Hongmeng Next: پخش کننده موسیقی

@Builder NavigationMenu(){
    Row({space:10}){
      Text('探索')
        .fontColor(Color.Black)
        .fontSize(15)
      Row()
        .width(1)
        .height(18)
        .backgroundColor(Color.Gray)
      Text('推荐')
        .fontColor(Color.Gray)
        .fontSize(15)
    }
    .width('100%')
    .justifyContent(FlexAlign.Center)
    .height(50)
    .alignItems(VerticalAlign.Center)
  }

 Navigation(){

  //内容部分
  }
  .titleMode(NavigationTitleMode.Mini)
  .hideBackButton(true)
  .width('100%')
  .height('100%')
  .backgroundColor('rgba(245, 245, 245, 1)')
  .menus(this.NavigationMenu())

ListItemGroup({header:this.SectionHeader('歌单遨游指南',false)}){
          ListItem(){
            Grid(){
              ForEach(this.albumList,(item:Album,index)=>{
                GridItem(){
                  Column(){
                    Image(item.cover)
                      .width(150)
                      .height(150)
                    Text(item.title)
                      .fontColor(Color.Black)
                      .fontSize(15)
                      .fontWeight(FontWeight.Bold)
                      .margin({top:5})
                      .maxLines(2)
                  }
                  .alignItems(HorizontalAlign.Center)
                  .width(150)
                  .height(200)
                }
              })
            }
            .width('100%')
            .rowsTemplate('1fr 1fr')
            .rowsGap(12)
            .columnsGap(10)
            .padding({left:12})
            .margin({top:5})
            .scrollBarWidth(0)

          }
          .height(400)
        }

Image($rawfile(this.musicList[this.currentIndex].cover))
              .width(this.screenWidth - 50)
              .height(this.screenWidth - 50)
              .borderRadius((this.screenWidth - 50)/2)
              .objectFit(ImageFit.Fill)
              .rotate({ x: 0, y: 0, z: 1, angle: this.value*360 })



 this.timer = setInterval(() => {
      // 保留2位小数
      this.value = this.value + 0.005

    }, 30);

Column(){

}
.bindSheet($$this.showList, this.listPage(), {
    height: 40 + (58 + 5)*this.musicList.length,
    backgroundColor: Color.White,
    showClose:false,
})


@Builder listPage(){
      Column(){
        Divider()
          .width('100%')
          .height(0.8)
          .backgroundColor('rgb(226,226,226)')
        List({space:0}){
          ForEach(this.musicList,(item:Music,index)=>{
            ListItem(){
              Row(){
                Column(){
                  Text(item.name)
                    .fontColor('#222628')
                    .fontSize(16)
                }
                .alignItems(HorizontalAlign.Start)

                if(this.currentIndex == index && this.isPlay){
                  Image($r('app.media.list_pause'))
                    .width(28)
                    .height(28)
                    .onClick(()=>{
                      this.playOrPause()
                    })
                }else{
                  Image($r('app.media.list_play'))
                    .width(28)
                    .height(28)
                    .onClick(()=>{
                      this.playSong(index)
                    })
                }
              }
              .alignItems(VerticalAlign.Center)
              .justifyContent(FlexAlign.SpaceBetween)
              .width('100%')
              .height(62)
            }
          })
        }
        .divider({strokeWidth:0.5,color:'rgb(236,236,236)'})
        .padding({left:20,right:20})
      }
      .expandSafeArea([SafeAreaType.SYSTEM],[SafeAreaEdge.BOTTOM])
      .alignItems(HorizontalAlign.Start)
      .width('100%')
      .backgroundColor(Color.White)
      .borderRadius({topLeft:20,topRight:20})
      .shadow({ radius: 30, color: 'rgba(230,230,230,0.7)', offsetX: 0, offsetY: -20 })
  }

// 创建avPlayer实例对象
    let avPlayer: media.AVPlayer = await media.createAVPlayer();
    // 创建状态机变化回调函数
    this.setAVPlayerCallback(avPlayer);
    // 通过UIAbilityContext的resourceManager成员的getRawFd接口获取媒体资源播放地址
    // 返回类型为{fd,offset,length},fd为HAP包fd地址，offset为媒体资源偏移量，length为播放长度
    let context = getContext(this) as common.UIAbilityContext;
    let fileDescriptor = await context.resourceManager.getRawFd(this.musicList[this.currentIndex].url);
    let avFileDescriptor: media.AVFileDescriptor =
      { fd: fileDescriptor.fd, offset: fileDescriptor.offset, length: fileDescriptor.length };
    this.isSeek = false; // 支持seek操作
    // 为fdSrc赋值触发initialized状态机上报
    avPlayer.fdSrc = avFileDescriptor;
    this.avPlayer = avPlayer