Part 3: Flutter Video Call App: Register, Profile Setup, Splash Screen & Android Permissions

Описание: In this final installment, we complete our professional Video Call application. We move from infrastructure to user experience - implementing a secure authentication flow, dynamic profile management, and the critical Android configurations needed for reliable background call alerts.

*What we are covering today:*
✅ **Secure Registration & Login**: Implementing a robust Firebase Auth flow with proper validation, state management (GetX), and real-time connectivity checking (ConnectivityService).

✅ *Profile Setup & Image Upload**: How to use the **ImgBB API* for zero-cost image hosting (Skip the Firebase Storage fees!) using automated REST API calls.

✅ **Firestore User Database**: Saving user metadata (UIDs, FCM Tokens) to enable seamless 1-on-1 signaling.

✅ **Splash Screen & Smart Routing**: Building a logic-driven entry point with custom animations that auto-navigates users based on their Auth & Profile state.

✅ **Android Production Setup**: Deep-dive into `AndroidManifest.xml` for `FULL_SCREEN_INTENT`, `WAKE_LOCK`, and "Show when Locked" capabilities to ensure calls ring on a locked device.

✅ **Complete Firebase Loop**: Finishing the FCM v1 integration with `dotenv` security to ensure your calls ring even when the app is closed.

This is where the app comes to life. By the end of this video, you will have a fully functional, market-ready video calling app for 2026.

*Resources & Links:*
Full Playlist:   • Build a WhatsApp Clone with Flutter | Vide...  
ImgBB API: https://api.imgbb.com/
Source Code: https://github.com/prof22/agora-video...