Use the bp_get_template_part filter when you want to filter the template returned by BuddyPress’s bp_get_template_part() function. Your filter should accept three arguments ( $templates, $slug, $name ).

The example below illustrates how you can use the bp_get_template_part filter to change the template that’s used to display the activity tab of a member’s profile.

function my_template_part_filter( $templates, $slug, $name ) {

// check whether the current template being fetched is the activity template. If not, just return the current template
if ( ‘members/single/activity’ != $slug )
return $templates;

// current template being fetched is the activity template. Replace it with the generic plugins.php template
return bp_get_template_part( ‘members/single/plugins’ );
}

add_filter( ‘bp_get_template_part’, ‘my_template_part_filter’, 10, 3 );

Note: For an actual example of overloading an existing template part from a plugin, see Template Overload from a Plugin

If you want to programmatically supply the content without using a template file  load plugins.php and utilize its display functions. The example below will override the activity template part.

function my_template_filter_init() {

add_action( ‘bp_template_title’, ‘my_filter_template_title’ );
add_action( ‘bp_template_content’, ‘my_filter_template_content’ );
add_filter( ‘bp_get_template_part’, ‘my_template_part_filter’, 10, 3 );

}
add_action(‘bp_init’, ‘my_template_filter_init’);

function my_template_part_filter( $templates, $slug, $name ) {

if ( ‘members/single/activity’ != $slug )
return $templates;

return bp_get_template_part( ‘members/single/plugins’ );
}

function my_filter_template_title() {
echo ‘Title’;
}

function my_filter_template_content() {
echo ‘Content’;
}