how to post image from mobile sdcard to Facebook

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Android

Facebook-API

I've implemented a small piece of code that can post title, description, image from a url. But how do i select an image from sd card and allow user to post the image to facebook

The code that i used is as follows.

This code takes imageurl from another url.

shareDialog = new ShareDialog(MainActivity.this);
               if (ShareDialog.canShow(ShareLinkContent.class)) {
                   ShareLinkContent linkContent = new ShareLinkContent.Builder()
                           .setContentTitle("Hello")
                           .setContentDescription(
                                   "sample")
                           .setContentUrl(Uri.parse("http://abc.com/"))
                           .setImageUrl(Uri.parse("http://s3-ak.buzzfed.com/static/images/public/verticals/food-title.png?v=201504021353"))
                           .build();

                   shareDialog.show(linkContent);

I also implemented a code where user can select image from gallery and get the image name and path. Now how do i pass this image parameter to ShareLinkContent