ChatApp

ChatApp is a Java-based realtime chatting Android application built with Firebase, FCM, and Glide. It offers seamless authentication via OTP verification, leveraging Firebase Firestore for efficient data storage including user profiles, chat histories, and media content. The app features real-time user status indicators, username search functionality, and instant notifications powered by FCM for new messages.

Features

• Authentication with OTP: Seamlessly verifies users' phone numbers using OTP verification for secure login.

• Real-time Chat: Enables users to communicate in real-time with other users, with chat histories stored efficiently in Firebase Firestore.

• Chat Request System: Enhances security by allowing users to initiate chats only after their request is accepted by the other user, preventing unwanted communication.

• Message Encryption: Ensures the security of messages by encrypting them using AES before storing them in the database, safeguarding user privacy and data integrity.

• Instant Notifications: Employs FCM to deliver instant notifications upon receiving new chat messages, ensuring timely responses.

• Media Content Handling: Supports the storage and sharing of media content within chats, ensuring a rich messaging experience.

• Offline Message Queue: Messages sent while offline are queued and sent automatically once the user goes online, ensuring seamless communication even in low-connectivity scenarios.

• User Presence Indicators: Displays users' online status, allowing for better communication timing and engagement.

• Dual Search Functionality: Facilitates easy discovery of other users through two search options: by username or by mobile number, providing flexibility and convenience.

Tech Stack

IDE: Android Studio

Languages: Java, XML

Database: Firebase Firestore for chats, profiles etc. and Firebase Storage for Media

Notification: Firebase Cloud Messaging

Libraries

// Country code picker
implementation 'com.hbb20:ccp:2.5.0'

// Handling media
implementation 'com.github.dhaval2404:imagepicker:2.1'
implementation 'com.github.bumptech.glide:glide:4.15.1'

//Firebase cloud messaging
implementation 'com.google.firebase:firebase-messaging:23.4.0'
implementation("com.squareup.okhttp3:okhttp:4.10.0")