我正在开发一个应用程序，它需要从网络服务器下载一些文件并将它们存储在设备上，以便脱机使用。我使用的代码在Android和iOS中运行良好，但是我在Blackberry 10上下载多个文件时遇到了困难。
从查看Web控制台看，成功回调是针对第一个文件成功执行的，但对于任何后续文件都没有。不会为后续文件调用失败回调。
我正在使用cordova 2.9，并且我已经包含了所有必需的webworks插件。我已在config.xml中设置了对我的域的访问权限，并设置了access_shared权限。
我还编辑了cordova FileTransfer.download函数来调用webworks下载api“blackberry.io.filetransfer.download”。
以下是我编写的JavaScript代码。
// Wait for device API libraries to load
//
document.addEventListener("deviceready", onDeviceReady, false);
// device APIs are available
//
function onDeviceReady() {
//replace list with your files you wish to download
var files = ["files/file1.txt", "files/file2.txt", "files/dir1/file3.txt"];
initiateDownload(files);
//getFSRoot(files);
}
var filesToDownload = 0;
var fileList = new Array();
var failedFileList;
var numFailedFiles = 0;
var currentFileIndex;
var retryCount = 0;
var root;
function isOnline(){
var bIsOnline = false;
if (navigator.connection.type != Connection.NONE && navigator.connection.type != Connection.UNKNOWN)
{
bIsOnline = true;
}
return bIsOnline;
}
function initiateDownload(files){
alert("initiate download");
failedFileList = new Array();
filesToDownload = files.length;
blackberry.io.sandbox = false;
for (i = 0; i < files.length; i++)
{
currentFileIndex = i;
console.log("initiate download of file index " + i + " File Name: " + files[i]);
getFile(files[i]);
}
}
function getFile(filePath)
{
//TODO: Do we need to make this function recursive to serialize asynchronous downloads?
console.log("START of function getFile() for " + filePath);
window.requestFileSystem(
LocalFileSystem.PERSISTENT, 0,
function onFileSystemSuccess(fileSystem)
{
console.log("Success getting filesystem for filePath: " + filePath);
createDirs(fileSystem.root, filePath, -1);
},
function(error){
console.log("Failed to get the filesystem for filePath: " + filePath);
}
);
}
function createDirs(parentDir, filePath, index)
{
console.log("createDirs params ===> parentDir=" + parentDir.toURL() + " filePath=" + filePath + " index=" + index);
arrDirs = filePath.split("/");
if (index >= (arrDirs.length - 1))
{
createFile(arrDirs[index], parentDir, filePath);
}
else
{
dirName = "myapp";
if (index >= 0)
{
dirName = arrDirs[index];
}
//if device is Blackberry, build up a full directory path as we are trying to install outside of sandbox
var path, dirToCreate = ""
if(device.platform = "BlackBerry"){
path = "myapp/";
console.log("JHPaths ======> arrDirs = " + arrDirs + " index = " +index);
for (i = 0; i <= index; i++){
path += arrDirs[i] + "/";
console.log("path = " + path + " i = " + i + " index = " + index);
}
dirToCreate = blackberry.io.home + "/" + path;
dirToCreate = dirToCreate.substring(0, dirToCreate.length - 1);
console.log("JHPaths Trying to create " + dirToCreate);
dirName = dirToCreate;
}
parentDir.getDirectory(dirName, {create: true, exclusive: false},
function (directoryEntry) {
console.log("Got directory " + directoryEntry.fullPath);
createDirs(directoryEntry, filePath, index + 1);
},
function (error) {console.log("Failed to get directory " + dirName + " Error code : " + error.code);});
}
}
function createFile(fileName, parentDir, filePath)
{
parentDir.getFile(
fileName, {create: true, exclusive: false},
function gotFileEntry(fileEntry)
{
localPath = fileEntry.fullPath;
if (isOnline())
{
console.log("Before remove");
fileEntry.remove(
function(){
console.log("FileEntry remove() was successful");
},
function(){
console.log("FileEntry remove() was failed");
}
);
console.log("After remove");
var fileTransfer = new FileTransfer();
//replace URL with the URL code you wish to download from
var baseURL = "http://<ip-address>/WebFolder/";
var uri = encodeURI(baseURL + filePath);
fullFilePath = blackberry.io.home + "/myapp/" + filePath;
fileTransfer.download(
uri,
/*localPath,*/
fullFilePath,
function(entry) {
console.log("download complete: " + entry.fullPath);
/*if(currentFileIndex < fileList.length){
currentFileIndex++;
}*/
if (device.platform == "iOS")
{
console.log("Setting file metadata");
parentDir.getFile(
fileName, {create:false, exclusive: false},
function gotFileEntry(fileEntry)
{
fileEntry.setMetaData(
function(){console.log("Set metadata for " + fileEntry.fullPath)},
function(){console.log("Set metadata failed for " + fileEntry.fullPath)},
{"com.apple.MobileBackup": 1}
);
},
function getFileFailed(fileError)
{
console.log("Get file failed:" + fileError.code);
}
);
}
filesToDownload--;
if (filesToDownload == 0 && failedFileList.length == 0)
{
//Call to retry failed Files
}
else if(failedFileList.length > 0){
if(retryCount < 1){
retryFailedFiles();
}
else{
}
}
},
function(error) {
console.log("Cache file download error source " + error.source);
console.log("Cache file download error target " + error.target);
console.log("Cache file download error code " + error.code);
//failedFileList[numFailedFiles++] = filePath;
failedFileList[numFailedFiles++] = filePath;
filesToDownload--;
if (filesToDownload == 0 && failedFileList.length == 0)
{
}
else if(failedFileList.length > 0){
if(retryCount < 1){
retryFailedFiles();
}
else{
}
}
}
);
}
},
function getFileFailed(fileError)
{
console.log("Create file failed:" + fileError.code);
filesToDownload--;
/*if (filesToDownload == 0)
{
callbackDeferred.resolve();
}*/
}
);
}
function retryFailedFiles(){
console.log("Retrying failed files");
retryCount++;
initiateDownload(failedFileList);
}