How to display notice in admin panel on Plugin Activation?

For plugin activations, the 'admin_notices' hook cannot be used directly, because there is a redirect. A workaround is to store your notice in the options table and check for it next time. Also, if you also want to cover plugin upgrades as well as activations, you will need to use another hook, such as 'admin_init' (since WP 3.1, see http://make.wordpress.org/core/2010/10/27/plugin-activation-hooks/).

Here is a complete sample plugin handling both activation and upgrade. I made the deferred notice an array so you can stack them up.

<?php/*Plugin Name: My Plugin*/register_activation_hook(__FILE__, 'my_plugin_activation');function my_plugin_activation() {  $notices= get_option('my_plugin_deferred_admin_notices', array());  $notices[]= "My Plugin: Custom Activation Message";  update_option('my_plugin_deferred_admin_notices', $notices);}add_action('admin_init', 'my_plugin_admin_init');function my_plugin_admin_init() {  $current_version = 1;  $version= get_option('my_plugin_version');  if ($version != $current_version) {    // Do whatever upgrades needed here.    update_option('my_plugin_version', $current_version);    $notices= get_option('my_plugin_deferred_admin_notices', array());    $notices[]= "My Plugin: Upgraded version $version to $current_version.";    update_option('my_plugin_deferred_admin_notices', $notices);  }}add_action('admin_notices', 'my_plugin_admin_notices');function my_plugin_admin_notices() {  if ($notices= get_option('my_plugin_deferred_admin_notices')) {    foreach ($notices as $notice) {      echo "<div class='updated'><p>$notice</p></div>";    }    delete_option('my_plugin_deferred_admin_notices');  }}register_deactivation_hook(__FILE__, 'my_plugin_deactivation');function my_plugin_deactivation() {  delete_option('my_plugin_version');   delete_option('my_plugin_deferred_admin_notices'); }

UPDATE: There's also a common way to use set_transient() instead of update_option(), and to direct messages to the correct admin user. This post concerns metaboxes, not plugin activation, but the techniques work the same just about everywhere in Dashboard, as far as I know: https://wordpress.stackexchange.com/questions/15354/passing-error-warning-messages-from-a-meta-box-to-admin-notices

This is so simple to show a notice

function your_admin_notice(){echo '<div class="updated">   <p>I am a little yellow notice.</p>    </div>';    }add_action('admin_notices', 'your_admin_notice');

But if you want to show a Dismissible Notice then try below

    add_action('admin_notices', 'example_admin_notice');function example_admin_notice() {    global $current_user ;        $user_id = $current_user->ID;        /* Check that the user hasn't already clicked to ignore the message */    if ( ! get_user_meta($user_id, 'example_ignore_notice') ) {        echo '<div class="updated"><p>';         printf(__('This is an annoying nag message.  Why do people make these? | <a href="%1$s">Hide Notice</a>'), '?example_nag_ignore=0');        echo "</p></div>";    }}add_action('admin_init', 'example_nag_ignore');function example_nag_ignore() {    global $current_user;        $user_id = $current_user->ID;        /* If user clicks to ignore the notice, add that to their user meta */        if ( isset($_GET['example_nag_ignore']) && '0' == $_GET['example_nag_ignore'] ) {             add_user_meta($user_id, 'example_ignore_notice', 'true', true);    }}

And if you want to show that notice on certain page try below condition.

    function my_admin_notice(){    global $pagenow;    if ( $pagenow == 'plugins.php' ) {         echo '<div class="updated">             <p>This notice only appears on the plugins page.</p>         </div>';    }}add_action('admin_notices', 'my_admin_notice');

You can see here

Just use a <div class='updated'>. For example -

echo "<div class='updated'>Test Plugin Notice</div>";