Cannot Download images from server

Hello, I am newbie for ionic 3 development. I am trying to use file and fileTransfer plugin for downloading images from server, but not getting anything when installed in android device.

Here is my code

download(id, image){

        console.log('gallery id is','id',id,'image',image);
        const fileTransfer: FileTransferObject = this.transfer.create();
        var downloadurl = "http://path/to/file/images/gallery/"+image
        var uri = encodeURI(downloadurl);
        var filepath = this.file.dataDirectory+ '/'+ image;, filepath, true).then((entry) => {
          console.log('download complete: ' + entry);
          this.imageSrc = entry.toUrl();
        }).catch(error => {


Did I miss anything in the code, Please I need guidance for this issue.
Thank you.