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网站开发书籍,百度引擎,网站开发项目可行性分析,做的最少的网站构建主界面主界面由视频轮播模块和多个视频列表模块组成，效果图如图： VideoData.ets中定义的视频轮播图数组SWIPER_VIDEOS和视频列表图片数组HORIZONTAL_VIDEOS。 // VideoData.ets import { HorizontalVideoItem } from ./HorizontalVideoItem; impo…

构建主界面

主界面由视频轮播模块和多个视频列表模块组成，效果图如图：

VideoData.ets中定义的视频轮播图数组SWIPER_VIDEOS和视频列表图片数组HORIZONTAL_VIDEOS。

// VideoData.ets
import { HorizontalVideoItem } from './HorizontalVideoItem';
import { SwiperVideoItem } from './SwiperVideoItem';export const SWIPER_VIDEOS: SwiperVideoItem[] = [new SwiperVideoItem($r('app.media.banner1')),new SwiperVideoItem($r('app.media.banner2')),new SwiperVideoItem($r('app.media.banner3'))
];export const HORIZONTAL_VIDEOS: HorizontalVideoItem[] = [new HorizontalVideoItem(1, $r('app.media.video_list0'), '视频1'),new HorizontalVideoItem(2, $r('app.media.video_list1'), '视频2'),new HorizontalVideoItem(3, $r('app.media.video_list2'), '视频3')
];

IndexSwiper.ets文件中定义的轮播图子组件SwiperVideo，点击轮播图片，页面跳转到视频播放页面，并携带本地视频flag，效果图如图：

// IndexSwiper.ets
@Component
export struct SwiperVideo {build() {Column() {Swiper() {ForEach(SWIPER_VIDEOS, (item: SwiperVideoItem) => {SwiperItem({ imageSrc: item.image, source: $rawfile('videoTest.mp4') })}, (item: SwiperVideoItem) => JSON.stringify(item))}.autoPlay(true)}// 样式设置...}
}@Component
struct SwiperItem {private imageSrc: Resource = $r('app.string.empty');private source: Resource = $r('app.string.empty');private paramItem: ParamItem = new ParamItem();...build() {// 跳转一：使用Navigator组件跳转到视频播放界面Navigator({ target: SECOND_PAGE, type: NavigationType.Push }) {Image(this.imageSrc).borderRadius(MARGIN_FONT_SIZE.FIRST_MARGIN)}.params(this.paramItem)}
}

IndexModule.ets文件中定义的视频列表图片子组件VideoModule，点击子组件中的图片，页面跳转到视频播放页面，并携带网络视频flag，效果图如图：

// IndexModule.ets
@Component
export struct VideoModule {private moduleName: string = '';build() {Column() {// 视频列表上方的文本信息...// 视频列表组件List({ space: MARGIN_FONT_SIZE.FIRST_MARGIN }) {ForEach(HORIZONTAL_VIDEOS, (item: HorizontalVideoItem) => {ListItem() {HorizontalItem({imageSrc: item.image,source: NET,videoName: item.name})}}, (item: HorizontalVideoItem) => JSON.stringify(item))}// 设置列表横向排列.listDirection(Axis.Horizontal)}// 样式设置...}
}@Component
struct HorizontalItem {private imageSrc: Resource = $r('app.string.empty');private source: string = '';private videoName: string = '';build() {// 跳转二：使用route跳转到视频播放界面Column() {Image(this.imageSrc).width(MARGIN_FONT_SIZE.SEVENTH_MARGIN).height(MARGIN_FONT_SIZE.SIXTH_MARGIN).onClick(() => {router.pushUrl({url: SECOND_PAGE,params: { source: this.source }});})...}.justifyContent(FlexAlign.Center)}
}

在SimpleVideoIndex.ets主界面中引用SwiperVideo和VideoModule子组件。

// SimpleVideoIndex.ets
@Entry
@Component
struct SimpleVideoIndex {build() {Column({ space: MARGIN_FONT_SIZE.FOURTH_MARGIN }) {// 视频轮播组件SwiperVideo()List() {ForEach(LIST, (item: string) => {ListItem() {VideoModule({ moduleName: item }).margin({ top: MARGIN_FONT_SIZE.FIRST_MARGIN })}}, (item: string) => JSON.stringify(item))}.listDirection(Axis.Vertical).margin({ top: MARGIN_FONT_SIZE.THIRD_MARGIN })}...}
}

构建视频播放界面

VideoPlayer.ets其中定义了视频播放子组件VideoPlayer ，onPrepared回调方法中可以获取视频总时长，onUpdate回调方法中可实时获取到视频播放的当前时间戳，onFinish是视频播放结束后的回调方法，onError是视频播放出错的回调方法。

// VideoPlayer.ets
@Component
export struct VideoPlayer {private source: string | Resource = '';private controller: VideoController = new VideoController();private previewUris: Resource = $r('app.media.preview');@Provide currentTime: number = 0;@Provide durationTime: number = 0;@Provide durationStringTime: string = START_TIME;@Provide currentStringTime: string = START_TIME;@Consume isPlay: boolean;@Consume isOpacity: boolean;@Consume flag: boolean;@Consume isLoading: boolean;@Consume progressVal: number;build() {Column() {Video({src: this.source,previewUri: this.previewUris,controller: this.controller}).width(ALL_PERCENT).height(STRING_PERCENT.NINETY_PERCENT).controls(false).autoPlay(false).objectFit(ImageFit.Contain).loop(false).onUpdate((event) => {if (event) {this.currentTime = event.time;this.currentStringTime = changeSliderTime(this.currentTime);}}).onPrepared((event) => {this.prepared(event?.duration);}).onFinish(() => {this.finish();}).onError(() => {prompt.showToast({duration: COMMON_NUM_DURATION,message: MESSAGE});})VideoSlider({ controller: this.controller })}}...
}

在自定义组件VideoPlayer底部使用了自定义子组件VideoSlider，VideoSlider自定义组件中显示和控制视频播放进度，效果图如图：

// VideoPlaySlider.ets
@Component
export struct VideoSlider {@Consume isOpacity: boolean;private controller: VideoController = new VideoController();@Consume currentStringTime: string;@Consume currentTime: number;@Consume durationTime: number;@Consume durationStringTime: string;@Consume isPlay: boolean;@Consume flag: boolean;@Consume isLoading: boolean;@Consume progressVal: number;build() {Row({ space: MARGIN_FONT_SIZE.FIRST_MARGIN }) {...Slider({value: this.currentTime,min: 0,max: this.durationTime,step: 1,style: SliderStyle.OutSet}).blockColor($r('app.color.white')).width(STRING_PERCENT.SLIDER_WITH).trackColor(Color.Gray).selectedColor($r("app.color.white")).showSteps(true).showTips(true).trackThickness(this.isOpacity ? SMALL_TRACK_THICK_NESS : BIG_TRACK_THICK_NESS).onChange((value: number, mode: SliderChangeMode) => {this.sliderOnchange(value, mode);})...}.opacity(this.isOpacity ? DEFAULT_OPACITY : 1)...}...
}

在VideoController.ets中的视频控制和回调的相关方法。

// VideoControll.ets
export function changeSliderTime(value: number): string {let second: number = value % COMMON_NUM_MINUTE;let min: number = Number.parseInt((value / COMMON_NUM_MINUTE).toString());let head = min < COMMON_NUM_DOUBLE ? `${ZERO_STR}${min}` : min;let end = second < COMMON_NUM_DOUBLE ? `${ZERO_STR}${second}` : second;let nowTime = `${head}${SPLIT}${end}`;return nowTime;
}

在SimpleVideoPlay.ets播放界面，引用VideoPlayer子组件，并在视频播放页面使用堆叠容器，在视频播放画面中心堆叠控制、视频加载图标，效果图如图：

// SimpleVideoPlay.ets
@Entry
@Component
struct Play {// 取到Index页面跳转来时携带的source对应的数据。private source: string = (router.getParams() as Record<string, Object>).source as string;private startIconResource: Resource = $r('app.media.ic_public_play');private backIconResource: Resource = $r('app.media.ic_back');@Provide isPlay: boolean = false;@Provide isOpacity: boolean = false;controller: VideoController = new VideoController();@Provide isLoading: boolean = false;@Provide progressVal: number = 0;@Provide flag: boolean = false;...onPageHide() {this.controller.pause();}build() {Column() {// 顶部返回以及标题...Stack() {// 不同的播放状态渲染不同得控制图片if (!this.isPlay && !this.isLoading) {Image(this.startIconResource).width(MARGIN_FONT_SIZE.FIFTH_MARGIN).height(MARGIN_FONT_SIZE.FIFTH_MARGIN)// 同一容器中兄弟组件显示层级关系，z值越大，显示层级越高 用于控制图片在视频上。.zIndex(STACK_STYLE.IMAGE_Z_INDEX)}if (this.isLoading) {Progress({value: STACK_STYLE.PROGRESS_VALUE,total: STACK_STYLE.PROGRESS_TOTAL,type: ProgressType.ScaleRing}).color(Color.Grey).value(this.progressVal).width(STACK_STYLE.PROGRESS_WIDTH).style({strokeWidth: STACK_STYLE.PROGRESS_STROKE_WIDTH,scaleCount: STACK_STYLE.PROGRESS_SCALE_COUNT,scaleWidth: STACK_STYLE.PROGRESS_SCALE_WIDTH}).zIndex(STACK_STYLE.PROGRESS_Z_INDEX)}VideoPlayer({source: this.source,controller: this.controller}).zIndex(0)}}.height(ALL_PERCENT).backgroundColor(Color.Black)}
}