move file_uri phonegap

window.resolveLocalFileSystemURL(
    imageUri,
    function(fileEntry){
        newFileName = Math.random().toString(36).substring(7) + "." + imageUri.split('.').pop();
        window.resolveLocalFileSystemURL(cordova.file.dataDirectory,
            function(dirEntry) {
                fileEntry.moveTo(dirEntry, newFileName, successfn, failfn);
            },
            failfn);
    },
    failfn
);