【鸿蒙应用实战开发】拍照、拍视频、选择图片、选择视频、选择文件工具类

前言

鸿蒙开发过程中，经常会进行系统调用，拍照、拍视频、选择图库图片、选择图库视频、选择文件。今天就给大家分享一个工具类。

1.话不多说，先展示样式

2.设计思路

根据官方提供的指南开发工具类，基础的拍照、拍视频、图库选照片、选文件不过多缀述，图库选择这里设计成集合形式，可返回图片和视频，视频展示时不显示内容，所以在工具类多加了一个获取视频缩略图的功能。

3.具体代码

import common from '@ohos.app.ability.common';
import picker from '@ohos.file.picker';
import mediaLibrary from '@ohos.multimedia.mediaLibrary';
import wantConstant from '@ohos.ability.wantConstant';
import { MediaBean } from '../bean/MediaBean';
import { StringUtils } from '../utils/StringUtils';

/**
 * @description 多媒体辅助类
 * @author Gwei
 * @time 2024/3/1 15:57
 */
export class MediaHelper {
  private readonly TAG: string = 'MediaHelper';

  private mContext: common.Context;

  constructor(context: common.Context) {
    this.mContext = context;
  }

  /**
   * 图库选择,返回最大数量为9的图片、视频集合
   */
  public selectPicture(count:number): Promise<Array<MediaBean>> {

    let imgList:Array<string> = [];
    let mediaList:Array<MediaBean> = [];
    try {
      let photoSelectOptions = new picker.PhotoSelectOptions();
      photoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE;
      photoSelectOptions.maxSelectNumber = 9-count;
      let photoPicker = new picker.PhotoViewPicker();
      return photoPicker.select(photoSelectOptions)
        .then((photoSelectResult) => {
          //Log.info(this.TAG, 'PhotoViewPicker.select successfully, PhotoSelectResult uri: ' + JSON.stringify(photoSelectResult));

          if (photoSelectResult && photoSelectResult.photoUris && photoSelectResult.photoUris.length > 0) {

            for (let i = 0; i < photoSelectResu