Question

在我的应用中，我获得了文件（doc，pdf，jpeg，...）的base64数据，并使用FileWriter编写。该文件现在位于我的app目录中。但我需要将其移至Android设备的下载目录。是否无法使用此代码访问：

 window.resolveLocalFileSystemURL('content:///storage/emulated/0/Download', function(a) {},fail};

我总是收到错误代码1。

在我的Android manifest.xml中，我目前只有WRITE_EXTERNAL_STORAGE权限。这够了吗？

感谢。顺便说一句，我使用 cordova3.4 和 android 4.3 。

Answer 1

sdcard路径在设备之间变化。

我建议您阅读File System plugin doc以获取完整信息。

如果您尚未修改config.xml以添加<preference name="AndroidPersistentFileLocation" value="Internal" />，我会说这应该可以完成这项任务：

window.resolveLocalFileSystemURI('/Download', function(dirEntry) {},fail};

或者其他方式：

window.requestFileSystem(LocalFileSystem.PERSISTENT, 0,
    function (fs) {
        fs.root.getDirectory("/Download", {
            create : false,
            exclusive : false
        }, function (dirEntry) { //success
            //do here what you need to do with Download folder
        }, function () {
            //error getDirectory
        });
    },
    function () {
    //error requestFileSystem
    }
);

Answer 2

这将帮助您在Cordova中将文件存储到您需要的目的地

公共类FileDownload扩展了CordovaPlugin {

int serverResponseCode = 0;

ProgressDialog dialog = null;

String upLoadServerUri = null;
final String DownloadFilePath = null;
final String DownloadFileNameOne = null;
private final String PATH = "/storage/sdcard0/DestinationFoloder/";
public static final String ACTION_FILE_UPLOAD = "fileUploadAction";



@Override
public boolean execute(String action, JSONArray args,CallbackContext callbackContext) throws JSONException {
   try {
        if (ACTION_FILE_UPLOAD.equals(action)) {
            File dir = new File("/storage/sdcard0/Destination");
            if (dir.mkdir()) {

                Log.e("Directory created","DC");

            } else {
                Log.e("Directory Not created","DNC");

            }
            JSONObject arg_object = args.getJSONObject(0);
            String DownloadFilePath = arg_object.getString("path");
            String DownloadFileNameOne = arg_object.getString("NameDwn");
            fdownload(DownloadFilePath,DownloadFileNameOne);

            callbackContext.success("Attachment Download Sucessfully!");

        }
        return false;
    } catch (Exception e) {
        System.err.println("Exception: " + e.getMessage());
        callbackContext.error(e.getMessage());
        return false;

    }

}



private boolean fdownload(String downloadFilePath2, String downloadFileNameOne2) {
    File FileCheck = new File(PATH+"/"+downloadFileNameOne2);

    if(FileCheck.exists()){

        return false;


    }else{

        try {
            URL url = new URL(downloadFilePath2); // you can write here
            // any
            // link
            Log.e("FilePath", "" + PATH + "" + downloadFileNameOne2);
            File file = new File("" + PATH + "" + downloadFileNameOne2);

            long startTime = System.currentTimeMillis();
            URLConnection ucon;
            ucon = url.openConnection();
            InputStream is = ucon.getInputStream();
            BufferedInputStream bis = new BufferedInputStream(is);
            /*
             * Read bytes to the Buffer until there is nothing more to
             * read(-1).
             */
            ByteArrayBuffer baf = new ByteArrayBuffer(50);
            int current = 0;
            while ((current = bis.read()) != -1) {
                baf.append((byte) current);
            }

            FileOutputStream fos = new FileOutputStream(file);
            fos.write(baf.toByteArray());
            fos.close();
            return true;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }




    }

}

}

Answer 3

为什么不直接使用Cordova插件：cordova-plugin-file。具体的文件位置是：cordova.file.externalRootDirectory +＆＃34;下载/＆＃34;。所以将window.resolveLocalFileSystemURL（）应用于此。

如何将文件移动到下载文件夹？

3 个答案: