问题

I have simple video playing apps both set up by PhoneGap and Chrome Apps CLI's (Both use Cordova), they contain a bunch of short educational videos and are needed as both website and application on Android/iOS for offline usage.

I have found, so far, that the total size of the Chrome Apps bundled file can't exceed 10mb and the PhoneGap Build can't exceed 40mb - so both will need to download and store files locally for later use. The videos will need to open and play from within the WebView browser - hotspots trigger JS that change the HTML5 video src. (AppCache and other HTML5 storage are out the question for mobile devices, they never seem to be able to reach triple digit storage space)

Has anyone had luck with a certain Cordova/PhoneGap/Chrome App API that can store files locally to achieve this spec?

Any advice/help/pointing in right direction appreciated!

回答1:

You can do this in Cordova apps (and very soon in Chrome Cordova apps). You'll need the most recent versions of the File (1.0.1) and FileTransfer (0.4.2) plugins.

With those, you can use FileTransfer.download() to download the video, and you can use File to access the file and create a <video> tag to play the video.

You'll want to use the .toNativeURL() method on the file entries before you play them. Recent versions of the File plugin use a custom URL scheme for files, which is unfortunately not compatible with the HTML <video> tag.

This is the test code that I use to test the interaction of these methods:

var filename = "small.mp4";
var videoURL = "http://techslides.com/demos/sample-videos/small.mp4";

requestFileSystem(PERSISTENT, 0, function(fileSystem) {
    var ft = new FileTransfer();
    ft.download(videoURL, fileSystem.root.toURL() + "/" + filename, function(entry) {
        var videoElement = document.createElement('video');
        videoElement.controls = 'controls';
        videoElement.src = entry.toNativeURL();
        document.videoElementById("output").appendChild(imgElement);
    });
});

Update

With the latest version of the File plugin (1.1.0), you no longer need to use .toNativeURL() to obtain a URL that you can use as a src attribute for a video. The standard .toURL() method will return such a URL.

回答2:

Here is the code to download file using phonegap filetransfer

 function downloadFile(){
    window.requestFileSystem(
                 LocalFileSystem.PERSISTENT, 0, 
                 function onFileSystemSuccess(fileSystem) {
                 fileSystem.root.getFile(
                             "test.html", {create: true, exclusive: false}, 
                             function gotFileEntry(fileEntry){
                             var Path = fileEntry.fullPath.replace("test.html","");
                             var fileTransfer = new FileTransfer();
                             fileEntry.remove();

                             fileTransfer.download(
                                       yourserverurl,
                                       Path + "yourfilename+extension",
                                       function(theFile) {
                                         window.localStorage.setItem("FilePath", theFile.toURL());
                                         console.log(theFile.toURL());
                                       },
                                       function(error) {
                                         console.log("upload error code: " + error.code);
                                       }
                                       );
                             }, 
                             fail);
                 }, 
                 fail);

}
 function fail(error) {
    console.log(error.target.error.code);
}

You can store the fileURL in localstorage for further usuage

来源：https://stackoverflow.com/questions/22047752/storing-video-for-offline-use-in-phonegap-chrome-apps

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android