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我想下載並使用URLSession保存視頻，然後在視頻播放器中播放。但不知何故，它不是在玩，而是在崩潰應用程序。這裏是它的代碼。我已經嘗試幾乎所有的東西來使用nativePath,getNativePath(),file.resolve()來讀取文件的確切路徑，但似乎沒有任何工作。看看代碼並提出解決方案。這是iOS版本。 （IOS版本8.4）如何使用URLSession下載視頻，保存並在Appcelerator鈦中播放？
更新的代碼：
var args = arguments[0] || {};
var vidWin = $.winTestVideo;
var isDownloading = false;
var urlSession = require("com.appcelerator.urlSession");
var downloadSession;
var urlArray = ["http://www.kaltura.com/p/{PARTNERID}/sp/{SUBPARTNERID}/playManifest/entryId/{entryId}/format/applhttp/protocol/http/flavorId/{flavorId}/video.mp4",
"http://www.kaltura.com/p/{PARTNERID}/sp/{SUBPARTNERID}/playManifest/entryId/{entryId}/format/applhttp/protocol/http/flavorId/{flavorId}/video.mp4"];
var urlArrIndex = 0;
var progress;
var videoPlayer;
var imageUrl = 'http://dreamatico.com/data_images/rose/rose-4.jpg';
//'http://cdn.playbuzz.com/cdn/5d41f0c6-2688-47fe-85cf-82890ef6d91d/45611be8-42f9-4d02-9b63-f7195c0dc18c_560_420.jpg';
var img;
function onLoad() {
Alloy.Globals.CurrentWindowName = 'testvideoplayer';
var triggerBtn = Ti.UI.createButton({
top : 10,
width : Ti.UI.FILL,
height : 40,
backgroundColor : "#cccccc",
color : "#000000",
title : "Download Videos"
});
vidWin.add(triggerBtn);
triggerBtn.addEventListener('click', downloadVideoBackround2);
progress = Titanium.UI.createProgressBar({
width : 200,
height : 20,
min : 0,
max : 1,
value : 0,
top : 60,
backgroundColor : "#0000ff",
style : Ti.UI.iPhone.ProgressBarStyle.BAR,
});
vidWin.add(progress);
img = Ti.UI.createImageView({
width : 100,
height : 100,
backgroundColor : "#cccccc"
});
//vidWin.add(img);
//videoPlayer.play();
}
function createVideoPlayer() {
videoPlayer = Ti.Media.createVideoPlayer({
width : Ti.UI.FILL,
height : 240,
top : 100,
mediaControlStyle : Titanium.Media.VIDEO_CONTROL_DEFAULT,
scalingMode : Titanium.Media.VIDEO_SCALING_ASPECT_FIT,
backgroundColor : "#000000",
});
vidWin.add(videoPlayer);
videoPlayer.removeEventListener('playbackstate', playbackStateEventListener);
videoPlayer.addEventListener('playbackstate', playbackStateEventListener);
}
// Require in the urlSession module
var urlSession = require("com.appcelerator.urlSession");
var session;
// App UI
function playbackStateEventListener(evt) {
Ti.API.error("PlaybackStateEventListener : " + JSON.stringify(evt));
}
function downloadVideoBackround2(evt){
// Create a session configuration
// The string parameter is an arbitrary string used to identify the session in events
var sessionConfig = urlSession.createURLSessionBackgroundConfiguration("com.appcelerator.test");
// Create a session
session = urlSession.createURLSession(sessionConfig);
// Create a background download task to get the asset with the URL
urlSession.backgroundDownloadTaskWithURL(session,urlArray[0].replace('applhttp','url'));
progress.show();
}
// Monitor this event to receive updates on the progress of the download
Ti.App.iOS.addEventListener("downloadprogress", function(e) {
// Update the progress indicator
Ti.API.error("DOWNLOAD PROGRESS : " + e.totalBytesWritten + "/" + e.totalBytesExpectedToWrite);
progress.value = (e.totalBytesWritten/e.totalBytesExpectedToWrite);
});
// Monitor this event to know when the download completes
Ti.App.iOS.addEventListener("downloadcompleted", function(e) {
Ti.API.error("download completed " + JSON.stringify(e));
// Update the image
try {
var file = Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory, 'myplvideo.mp4');
if (!file.exists()) {
file.createFile();
}
file.write(e.data);
Ti.API.error('data : ' + e.data.length);
Ti.API.error('file : ' + file.nativePath);
Ti.API.error('file resolve path :' + file.resolve());
progress.hide();
// Notify the user the download is complete if the application is in the background
setTimeout(function() {
//videoPlayer.media = file;
createVideoPlayer();
videoPlayer.media = file;
urlSession.finishTasksAndInvalidate(session);
//videoPlayer.play();
}, 3000);
//alert('Download completed!');
/*
Ti.App.iOS.scheduleLocalNotification({
alertAction : "update",
// Alert will display the following message
alertBody : "Download was successfull",
// The badge value in the icon will be changed to 1
badge : 1,
// Alert will be sent in three seconds
date : new Date(new Date().getTime() + 3000),
});*/
} catch(ex) {
Ti.API.error('download completed : ' + ex);
}
});
// Monitor this event to know when all session tasks have completed
Ti.App.iOS.addEventListener('sessioncompleted', function(e) {
try {
Ti.API.error("sessioncompleted " + JSON.stringify(e));
if (e.success) {
//alert("Downloads completed successfully.");
}
} catch(ex) {
Ti.API.error('Exception session completed : ' + ex);
}
});
當我分配file到videoPlayer的media屬性的應用程序崩潰。但是當我使用HttpClient下載文件時，它工作正常。不知道爲什麼會發生這種情況，因爲我在日誌中看不到任何錯誤。
這裏是日誌。我用[錯誤]突出顯示了重要的日誌記錄。
[ERROR] : DOWNLOAD PROGRESS : 67470/5794757
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[ERROR] : download completed {"taskIdentifier":1,"data":{},"bubbles":true,"type":"downloadcompleted","source":{},"cancelBubble":false}
[ERROR] : open on /var/mobile/Containers/Data/Application/9FBAAEB4-4878-4611-8BCC-EFC112AF9777/Documents/myplvideo.mp4: File exists
[ERROR] : data : 5794757
[ERROR] : file : file:///var/mobile/Containers/Data/Application/9FBAAEB4-4878-4611-8BCC-EFC112AF9777/Documents/myplvideo.mp4
[ERROR] : file resolve path :/var/mobile/Containers/Data/Application/9FBAAEB4-4878-4611-8BCC-EFC112AF9777/Documents/myplvideo.mp4
[ERROR] : sessioncompleted {"success":true,"message":"","errorCode":0,"taskIdentifier":1,"bubbles":true,"type":"sessioncompleted","source":{},"cancelBubble":false}