Custom Field of plugin does not update the value when assigned in Joomla Article

Question

Joomla 3.4 Stable Version, Content Plugin

Simply explain the problem > click here

Picture of custom field which assigned '5555' : http://i.stack.imgur.com/5qlsS.png

Expected Output: 5555

Real Output : defaultvalue

Print Output Code

$plugin = JPluginHelper::getPlugin('content', 'signal');

$params = new JRegistry($plugin->params);

echo $params->get('custom_1','default_value');

XML Code

<field name="custom_1"
       type="text"
       label="Custom Field 1"
       /> 

Answer 1

From the image it seems that the parameter you try to acess is not in the plugin ,but it is in the article (new field created by plugin) so try to use this code

$params= json_decode($this->item->attribs);
echo $params->custom_1;