how to build whatsapp like chat application in android

 There are various methods to develop chat application.

1) Using HTTP connection (In this method each and everytime you want to send message, you have to call the webservice and for receive message, you continously need to call the webservice using Timer).

2) Using XMPP Server (XMPP server uses Socket programming, so once a connection will be establish, then it uses that connection each and everytime, you no need to create connection everytime, like HTTP).

3) Using GCM (Using Push Notification you can send and receive messages as well).

Select the App Module Which Suits Your Business.

Choose Trending and Must-Have WhatsApp Features.

Select App Design.

Hire Android App Developers to Develop an App Like WhatsApp.