PSER D2D Mobile App

A mobile application built for Pakistan Social & Economic Registry (PSER) door-to-door surveys. The app allows field employees to collect household information, save incomplete surveys as drafts, continue working offline, and synchronize data with Supabase when an internet connection is available.

📱 Android APK

Download the latest Android APK:

Features

• 🔐 Employee authentication
• 👤 Employee profile
• 📝 Multi-step survey form
• 💾 Save surveys as drafts
• 📱 Offline draft support
• 🔄 Automatic draft synchronization
• ☁️ Supabase backend integration
• 🖼️ Person image support
• 📋 View completed surveys
• ✏️ Resume incomplete surveys
• 🗑️ Delete drafts when online
• 🌐 Network connectivity detection
• 🎨 Clean and responsive UI
• 📊 Survey progress indicator
• 🔒 Employee-based data access

Survey Steps

The survey is divided into three steps:

1. Personal Information

   • Name
   • Phone number
   • CNIC
   • Address
   • Age
   • Person image

2. Education & Occupation

   • Education
   • Occupation

3. Household Information

   • House ownership
   • Illness information
   • Marital status
   • Illness details

Offline Draft System

The app supports working without an internet connection.

Drafts are temporarily stored in AsyncStorage and synchronized with Supabase when the device comes back online.

Draft Flow

Create Draft
     ↓
AsyncStorage
     ↓
Internet Available?
     ↓
   Yes
     ↓
Supabase Sync
     ↓
synced: true

Each local draft contains:

{
    id: "local-123",
    remote_id: "supabase-id",
    synced: true
}

• id → Local AsyncStorage ID
• remote_id → Supabase draft ID
• synced → Indicates whether local and remote data are synchronized

Tech Stack

Mobile

• React Native
• Expo
• Expo Router
• JavaScript
• React Native Paper

Backend

• Supabase
• Supabase Authentication
• PostgreSQL
• Supabase Storage

Local Storage

• AsyncStorage
• Zustand

Other Tools

• Expo EAS
• React Native NetInfo

Data Synchronization

The application uses a local-cache approach for drafts.

Online

When the employee is online:

1. Fetch drafts from Supabase.
2. Read cached drafts from AsyncStorage.
3. Match local drafts with their Supabase records.
4. Keep local-only drafts.
5. Update the local cache.
6. Display the combined draft list.

Offline

When the employee is offline:

1. Read drafts from AsyncStorage.
2. Filter drafts belonging to the logged-in employee.
3. Display them without making Supabase requests.

Authentication

Employees log in using their credentials and employee information is loaded from Supabase.

Only authorized employees can access their assigned survey data.

.env

Create a .env file and add your Supabase project details:

EXPO_PUBLIC_SUPABASE_URL=your_supabase_url
EXPO_PUBLIC_SUPABASE_PUBLISHABLE_KEY=your_supabase_key

Purpose

The purpose of this application is to make door-to-door survey data collection easier for field employees by providing a structured survey workflow with offline draft support and reliable synchronization when connectivity is restored.