Developing a simple mobile application
Let's create a simple mobile messenger application. The idea of the application is to check the logged-in user's contacts list and then if anyone from those contacts is using the application, it will show them in a list from where the user can start messaging them in the application. The application will allow you to send one-to-one messages to one of the user's contacts and, on the other end, the user can view it and reply. This would be a good start as we will learn many important things to build applications.
Let's break down the problem statement, which will be easy for us to build the application:
We need to provide a login interface and while logging in, we must save the necessary details, such as the phone number, to the server database.
After logging in, the user should see the contacts using this application, which means we need access to the user's contacts. Once contacts are fetched, we will check whether any of them are using the application...
