window.plugins.webintent.EXTRA_STREAM

Hi I am using EXTRA_STREAM to receive the file from gallery,but I am getting null,please tell me any solution
window.plugins.webintent.getExtra(window.plugins.webintent.EXTRA_STREAM,
        function (data) {           
                console.log(data);
              }, function (err) {
                console.log(err);
              });