android – 如何使用cordova文件/文件系统根插件访问外部存储？

从mailing list我读的这个应该是可能的.似乎我错过了一个关键点？

语境：
我尝试启用一个为iPhone创建的混合应用程序在Android设备上运行.要有一个小游乐场,我创建一个小测试项目.

编辑：
文件系统根和文件插件之间似乎存在问题.但我有两个最新版本. (文件：1.0.1文件系统根：0.1.0)
调试文件系统和文件类显示

private String fullPathForLocalURL(Uri URL) {
    if (FILESYstem_PROTOCOl.equals(URl.getscheR_343_11845@e()) && "localhost".equals(URl.getHost())) {
        String path = URl.getPath();
        if (URl.getQuery() != null) {
            path = path + "?" + URl.getQuery();
        }
        return path.subString(path.indexOf('/',1));
        // path = "/cache-external" at this point
        // results in index out of bounds exception

我试过什么

config.xml中

<preference name="AndroidExtraFilesystems" value="files,files-external,documents,sdcard,cache,cache-external" />

AndroidManifest.xml中

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

JavaScript代码

function createTextDocument(filename,text) {

    cordova.filesystem.getDirectoryForPurpose('cache',{sandBoxed: falsE},successCallBACk,failureCallBACk);

    function successCallBACk(directoryEntry){
        console.log('directory found (cordova): ' + directoryEntry.toURL());
        console.log('directory found (nativE) : ' + directoryEntry.toNativeURL());
        directoryEntry.getFile(filename,{Create: true,exclusive: falsE},function(fileEntry){
                var filePath = fileEntry.toNativeURL();
                fileEntry.createWriter(
                    function(fileWriter){
                        console.log('start wriTing to: ' + filePath );
                        fileWriter.write(text);
                        console.log('file written');
                    },failureCallBACk
                );
            },failureCallBACk
        );
    }

    function failureCallBACk(error){
        console.log('error creaTing file: ' + error.codE);
        // results in code 1000
    }
}

解决方法

window.resolveLocalFileSystemURL(path,cbsuccess,cbFail);

@param path: {String} a cordova path with scheR_343_11845@e: 
             'cdvfile://localhost/<file-system-name>/<path-to-file>' 
             Examples: 'cdvfile://localhost/sdcard/path/to/global/file'
                       'cdvfile://localhost/cache/onlyVisibleToTheApp.txt'
@param cbsuccess: {function} a callBACk method that receives a DirectoryEntry object.
@param cbFail: {function} a callBACk method that receives a FileError object.

<preference name="AndroidPersistentFileLOCATIOn" value="Compatibility" />
<preference name="AndroidExtraFilesystems" value="sdcard,cache" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />