How to Detect Mobile Device in Magento 2?

I created Index.php controller for that at app/code/Vendor/Modulename/Controller/Index/ and add this below code :

<?php

namespace Vendor\Modulename\Controller\Index;

class Index extends \Magento\Framework\App\Action\Action {

    /**
     * @var \Magento\Framework\View\Result\PageFactory
     */
    protected $resultPageFactory;

    /**
     * @var \Magento\Framework\HTTP\Header
     */
    protected $httpHeader;

    /**
     * @param \Magento\Framework\App\Action\Context      $context
     * @param \Magento\Framework\HTTP\Header             $httpHeader
     * @param \Magento\Framework\View\Result\PageFactory $resultPageFactory
     */
    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\HTTP\Header $httpHeader,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory
    ) {
        $this->httpHeader = $httpHeader;
        $this->resultPageFactory = $resultPageFactory;
        parent::__construct($context);
    }
    /**
     * Detect Mobile view or Desktop View
     *
     * @return void
     */
    public function execute() {
        $resultPage = $this->resultPageFactory->create();
        $userAgent = $this->httpHeader->getHttpUserAgent();
        $isMobile = \Zend_Http_UserAgent_Mobile::match($userAgent, $_SERVER);
        if ($isMobile) {
            $resultPage->getConfig()->getTitle()->prepend(__("Mobile View")); // Mobile view logic add here
        } else {
            $resultPage->getConfig()->getTitle()->prepend(__("Desktop View")); // Desktop view logic add here
        }
        return $resultPage;
    }

}

<?php

namespace Vendor\Modulename\Controller\Index;

class Index extends \Magento\Framework\App\Action\Action {

/**

* @var \Magento\Framework\View\Result\PageFactory

protected $resultPageFactory;

/**

* @var \Magento\Framework\HTTP\Header

protected $httpHeader;

/**

* @param \Magento\Framework\App\Action\Context $context

* @param \Magento\Framework\HTTP\Header $httpHeader

* @param \Magento\Framework\View\Result\PageFactory $resultPageFactory

public function __construct(

\Magento\Framework\App\Action\Context $context,

\Magento\Framework\HTTP\Header $httpHeader,

\Magento\Framework\View\Result\PageFactory $resultPageFactory

) {

$this->httpHeader = $httpHeader;

$this->resultPageFactory = $resultPageFactory;

parent::__construct($context);

}

/**

* Detect Mobile view or Desktop View

* @return void

public function execute() {

$resultPage = $this->resultPageFactory->create();

$userAgent = $this->httpHeader->getHttpUserAgent();

$isMobile = \Zend_Http_UserAgent_Mobile::match($userAgent, $_SERVER);

if ($isMobile) {

$resultPage->getConfig()->getTitle()->prepend(__("Mobile View")); // Mobile view logic add here

} else {

$resultPage->getConfig()->getTitle()->prepend(__("Desktop View")); // Desktop view logic add here

}

return $resultPage;

}

You can add this above code in your controller or any file. You need to inject \Magento\Framework\HTTP\Header class into your construct.

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