OffChat Android

OffChat Android is an offline-first Android prototype for peer-to-peer chat discovery and message transfer using Google Nearby Connections. It is the mobile counterpart to the OffChat simulator and explores real-device discovery, advertising, connection handshakes, and local persistence.

Highlights

• Android peer discovery and advertising through Nearby Connections.
• P2P cluster strategy for multi-device mesh-style connectivity.
• Runtime permission handling for Android 12+ Bluetooth and nearby-device APIs.
• Room database structure for offline-first message persistence.
• Kotlin Android project ready to open in Android Studio.

Tech Stack

• Kotlin
• Android SDK
• Google Play Services Nearby Connections
• Room Database
• Coroutines

Open Locally

1. Open Android Studio.
2. Select Open.
3. Choose this repository folder.
4. Let Gradle sync dependencies.
5. Run on two or more Android devices for peer discovery testing.

Core Files

app/src/main/java/com/research/offchat/MainActivity.kt
app/src/main/java/com/research/offchat/OffChatManager.kt
app/src/main/java/com/research/offchat/OffChatDatabase.kt
app/src/main/java/com/research/offchat/MessageDao.kt

Notes

The app requires Bluetooth, location, Wi-Fi state, and nearby-device permissions depending on Android version.