featured image inside post

Question

I want the featured image of a post to display not only in the blog list view, but also inside the post (when i press "Read More..."). How do i do that?

I pasted this

if ( has_post_thumbnail() ) { 
 the_post_thumbnail('full');
} 

in single.php just before the_post();. It looks like this:

while (have_posts()) {
    if ( has_post_thumbnail() ) { // check if the post has a Post Thumbnail assigned to it.
      the_post_thumbnail('full');
    } 
    the_post();
    get_template_part('content', 'single');
}

But the image shows up, above the title. How do i make it show after the title, just like in the blog list view?

Answer 1

@PatJ's answer affords the most control over the placement of the image but involves editing the theme, which may or may not be wise, or possible, depending on the circumstance, so an alternative is to add a filter to the_content.

function add_thumb_wpse_100914($content) {
    // check that we are on a 'single' post display and...
    // check if the post has a Post Thumbnail assigned to it.
    if ( is_single() && has_post_thumbnail() ) { 
      $content = get_the_post_thumbnail(null,'full').$content;
    } 
    return $content;
}
add_filter('the_content','add_thumb_wpse_100914');

Answer 2

There should be a file in your theme called content-single.php (if it's not there, look instead for content.php). Inside that file there will be a line like the_title(). If you put your the_post_thumbnail( 'full' ); after that line, it should appear after the title in the single page view.

Rationale

the_post() sets up the data for the next post in The Loop (in the case of a single page, it sets up the post/page). The next line in your single.php -- get_template_part() -- is where the post/page view is actually assembled; it should contain the_title(), the_content(), etc.

References

Codex:
the_post()
get_template_part()
the_title()