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我正在开发 ionic 3 应用程序,将视频从服务器下载到设备的本机存储。我用这个 URL 来保存文件:

let externalDir = this.file.externalDataDirectory;

文件下载很好,它已下载,我可以从设备上查看它。有关更多详细信息,存储中的文件链接是:

/storage/emulated/0/Android/data/xxxxxxxx/files/VideoTest1/0.mp4

但问题是我想使用标签将下载的视频播放到我的应用程序中<video>,我使用相同的链接查看它,但它不起作用。有什么帮助吗?对不起我的英语不好

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2 回答 2

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我一直在寻找解决方案。我按如下方式解决此问题。

platform.ready()函数之后,我创建了一个目录,如下所示。

this.file.createDir(this.file.externalDataDirectory , 'Videos', false).then(() => {
        // console.log('Directory created successfully');
      }).catch(() => {
        // console.log('Failed to create directory');
      });

在创建的目录中下载视频

import { FileTransfer, FileTransferObject } from '@ionic-native/file-transfer';
import { File } from '@ionic-native/file';
import { Diagnostic } from '@ionic-native/diagnostic';
...

constructor(private diagnostic: Diagnostic,
    private transfer: FileTransfer, private file: File)


download(item) {
    let downloadProgress: any;
    const fileTransfer: FileTransferObject = this.transfer.create();
    const url = encodeURI(item.url);
    const targetPath = this.file.externalDataDirectory + 'Videos/' + item.title + '.mp4';
    this.diagnostic.requestCameraAuthorization(true).then(() => {
        fileTransfer.download(url, targetPath, true).then((entry) => {
            // console.log('download complete: ' + entry.toURL());
          }, (error) => {
              console.log(error);
          });
          fileTransfer.onProgress((progress) => {
          downloadProgress = Math.round((progress.loaded / progress.total) * 100) + '%';
              console.log('Downloading progress ...', downloadProgress);
          });
    }, (error) => {
        console.log(error);
    });

  }

这会在创建的文件夹中下载一个文件Videos。您实际上可以通过Android/data/com.your.app/files/.

如果您正在使用android但不起作用,请在file.setReadable(true, false);里面添加FileTransfer.java.

播放视频以供离线使用 确保这些行存在于index.html

<meta http-equiv="Content-Security-Policy" content="style-src 'self' 'unsafe-inline'; media-src *; connect-src *">

在你的config.xml文件中

<access origin="*" />
<allow-navigation href="*" />
<allow-navigation href="http://*/*" />
<allow-navigation href="file://*/*" />
<access origin="cdvfile://*" />
<allow-intent href="*" />
<access origin="*" />

如果不添加它们。

然后最后在您的视频播放器页面中

<video id="video" controls="controls" preload="metadata" autoplay="autoplay" webkit-playsinline="webkit-playsinline" class="videoPlayer">
     <source [src]="content" type="video/mp4" />
</video>

并且在组件中

ionViewDidEnter() {
    this.file.listDir(this.file.externalDataDirectory, 'Videos')
      .then((data) => {
        console.log(data[0]);
        this.count = data.length;
        const src = data[0].toInternalURL();
        this.file.resolveLocalFilesystemUrl(src).then(data => {
          this.content = data.toURL();
          document.getElementById('video').setAttribute('src', this.content);
          console.log('Content path cahnged ', this.content);
        }, error => {
          console.log('File path error');
        })
      })
      .catch(err => console.log('Directory doesnt exist'));

  }

就是这样。我希望这行得通。

于 2018-04-26T13:13:57.293 回答
0

如果您想访问任何文件以进行移动设备的本机存储。然后你必须为你想要访问的文件夹创建一个本地服务器。

https://ionicframework.com/docs/native/httpd

constructor(public file:File, public ngZone : NgZone, public httpd :Httpd){
}

startLocalServe(){

    let options: HttpdOptions = {
      www_root: this.file.externalDataDirectory.replace('file://',''),
      port: 9000,
      localhost_only: true //if you want to create multiple localhost then false  
    };

    this.httpd.startServer(options).subscribe(url => {
      console.log('Server is live',url); //Server is live http://127.0.0.0.1:9000
      this.ngZone.run(()=>{
        this.localServeUrl = url;
      })

    },error => {
      console.log('Fail to start Server : ',JSON.stringify(error));
    });
  }

现在您可以将 localserveUrl 设置为 src="http://127.0.0.0.1:9000/VideoTest1/0.mp4"

将代码 startLocalServe 放入 app.component.ts

this.platform.ready().then(()=>{
startLocalServe();
});
于 2019-08-14T12:09:38.970 回答