In many applications we have to share content, links etc on Facebook. We can achieve this by using Facebook feed dialog. The following lines of code explains how to use feed/publish dialog.
First you need to get the app id and create a meta data. Now in the 'Application' tab, add a 'Meta Data' item called com.facebook.sdk.ApplicationId, with a value of the app_id(facebook app id).
To create facebook app id please visit this link https://developers.facebook.com/docs/android/getting-started
Now get facebook active session

Session session = Session.getActiveSession();
if(session == null)
{
    // do FB login
    doFBLogin();
}
else
{
    showFeedDialog();
}

// fb login method
private void doFBLogin()
    {
        // start Facebook Login
        Session.openActiveSession(this, true, new Session.StatusCallback() {

            // callback when session changes state
            @Override
            public void call(Session session, SessionState state, Exception exception) {
                if (session.isOpened()) {               
                    showFeedDialog();
                }
            }
        });
    }

Now definition of showFeedDialog() method

private void showFeedDialog() 
{    
    Bundle params = new Bundle();
    params.putString("name", "Write heading here");     
    params.putString("caption", "Write caption here");          
    params.putString("description", "Write description here");
    params.putString("link", "Link Url");
    params.putString("picture", "picture_url");

            WebDialog feedDialog = (
                    new WebDialog.FeedDialogBuilder(reviewDetail,
                            Session.getActiveSession(),
                            params))
                            .setOnCompleteListener(new OnCompleteListener() {

                                @Override
                                public void onComplete(Bundle values,
                                        FacebookException error) {
                                    if (error == null) {
                                        // When the story is posted, echo the success
                                        // and the post Id.
                                        final String postId = values.getString("post_id");
                                        if (postId != null) {
                                            /*Toast.makeText(reviewDetail,
                                                    "Posted story, id: "+postId,
                                                    Toast.LENGTH_SHORT).show();*/
                                            Toast.makeText(reviewDetail,
                                                    "Shared on FaceBook",
                                                    Toast.LENGTH_SHORT).show();
                                        } else {
                                            // User clicked the Cancel button
                                            Toast.makeText(reviewDetail.getApplicationContext(), 
                                                    "Publish cancelled", 
                                                    Toast.LENGTH_SHORT).show();
                                        }
                                    } else if (error instanceof FacebookOperationCanceledException) {
                                        // User clicked the "x" button
                                        Toast.makeText(reviewDetail.getApplicationContext(), 
                                                "Publish cancelled", 
                                                Toast.LENGTH_SHORT).show();
                                    } else {
                                        // Generic, ex: network error
                                        Toast.makeText(reviewDetail.getApplicationContext(), 
                                                "Error posting story", 
                                                Toast.LENGTH_SHORT).show();
                                    }
                                }

                            })
                            .build();
            feedDialog.show();

}

Please add Internet permission in your Manifest file. Also add facebook login activity in your manifest since it is required for FB login.