在我的 Ionic 应用程序中读取存储在 android 本机存储上的视频 [英] Read video stored on android native storage in my Ionic app

问题描述

我正在开发 ionic 3 应用程序，可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:

I am developing ionic 3 app that download videos from server to the device's native storage . i used this URL to save file:

let externalDir = this.file.externalDataDirectory;

文件下载正常，已下载，我可以从设备查看.有关更多详细信息，存储中的文件链接是:

file download is fine it is downloaded and i can view it from the device. for more details the file link in the storage is:

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

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

but the problem is i want to play that downloaded video into my app using <video> tag, i used the same link to view it but it doesn't work. any help? sorry for my english

推荐答案

我一直在寻找解决方案.我按如下方式解决了这个问题.

I've been searching for a solution. I resolve this issue as follows.

在 platform.ready() 函数之后，我创建了一个目录，如下所示.

After platform.ready() function I created a directory as follows.

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

To download videos inside the created directory

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 Videos 文件夹中下载一个文件.您实际上可以通过 Android/data/com.your.app/files/ 在设备上找到它.

That downloads a file inside the created Videos folder. You can actually find that on the device by going Android/data/com.your.app/files/.

如果您使用的是 android 并且不起作用，请在 FileTransfer.javafile.setReadable(true, false);>.

If you're using android and that didn't work, add file.setReadable(true, false); inside FileTransfer.java.

播放视频以供离线使用确保这些行存在于 index.html

To play the videos for offline usage Make sure these lines exist in 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.

最后在你的视频播放器页面

Then finally in your video player page

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

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.我希望有效.

And that's it. I hope that works.

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