How to upload an image on a server in jpg or png format in Titanium (Android)?

I want to upload an image to a server for my phone gallery.

I did with an iOS device, this works well. But there are problems in the Android device.

I take an image from the device gallery and publish on the server. It loads successfully. after that I see on the server.

the image of which is uploaded by the Android device is in .txt format. (iOS work well).

How do I remove the problem. Please help me show my coding structure.

 Ti.API.info("success! event: " + JSON.stringify(event));
        var image = event.media;

        var abc = event.media.imageAsResized(400 , 400);


        Ti.API.info(abc.height +" x "+ abc.width);
        alert(abc.height +" x "+ abc.width);

       var xhr = Titanium.Network.createHTTPClient();

        xhr.onerror = function(e)
        {
            Ti.API.info('IN ERROR ' + e.error);
            alert("error");
        };
        xhr.onload = function()
        {
            Ti.API.info('IN ONLOAD ' + this.status + ' readyState ' + xhr.responseText);
            alert("IN ONLOAD " + this.status + " readyState " + this.readyState + "re " +xhr.responseText);

        };


         xhr.open('POST','http://reviewprototypes.com/kishan/filetest.php');
        xhr.send({file:abc});
 },
                cancel : function() {

                    alert("Cancel Library ");
                },
                error : function(error) {

                    alert("Error Massage "+error);
                },
                allowImageEditing:true,

               });

Any suggestion is welcome. Thanks at Advance.