How to integrate whatsapp with android application or a website

We can integrate whatsapp with the android app in two ways:

1, Using the Android Intent System which we discussed in my previous blog: "How to share the media and text with the social android apps"

2. Using the custom URL scheme provided by whatsapp itself.

We will discuss the second one in this blog. 

WhatsApp provides a custom URL scheme to interact with whatsapp. If you have a website and want to open a WhatsApp chat with a pre-defined message, you can use whatsapp’s custom URL scheme.

Opening whatsapp://send?text= followed by the text to send, will open WhatsApp, allow the user to choose a contact, and pre-defined the input field with the specified text.

Here is an example of how to write this on your website:

<a href="whatsapp://send?text=Hello%20World!">Hello, world!</a>

This opens a Whatsapp application to select the contact. Once you select the contact, the predefined text "Hello World" will be posted to the chat window.

That’s it. Happy Coding...

Reference:  whatsapp faq.