Dairy Farm Management System Project (Android App) with Milk Collection Records and Payment Calculation

Village milk collection centers still run on paper registers: each farmer's morning and evening milk is weighed, a fat test and SNF/CLR reading is taken, and the numbers are written down by hand. At the end of every 10-day cycle, the operator manually totals liters per farmer, looks up the rate from the cooperative's fat/SNF chart, multiplies, subtracts advances, and writes payment slips — hundreds of arithmetic steps where a single misplaced decimal underpays a farmer or loses the center money. Disputes are common because there is no entry-wise history to check. This project replaces the register with an Android app: every collection is entered once with its fat, SNF and CLR readings, the rate is computed from a configurable two-axis fat/SNF chart, and the 10-day billing, ledgers and payment slips are generated from the same data — so the numbers always reconcile and every payment can be traced back to its entries.

1. The operator registers each farmer once (name, village, phone, animal count); records are stored in the on-device Room/SQLite database with a unique farmer ID.
2. Every shift, the operator opens the collection screen, picks the farmer, selects morning or evening, and enters quantity (0.1 L resolution), fat %, SNF % and the CLR reading from the analyzer.
3. The app computes the rate per liter from the configured fat/SNF chart — for example, fat 4.5% and SNF 8.6% at the default chart gives ₹33.70/L — and shows the payable amount before saving.
4. The entry is saved with a timestamp into the farmer's ledger; the dashboard updates today's totals, shift split and weighted average fat/SNF immediately.
5. At the end of the 10-day cycle, the app aggregates each farmer's entries: total liters, quantity-weighted average fat/SNF, gross amount, minus recorded deductions (feed advances), giving the net payable.
6. The operator generates the payment slip per farmer — printed on paper or sent by SMS — with the full entry-wise breakdown so the farmer can verify every line.

Tech stack:

• Kotlin (Android)
• Android Studio
• Room · SQLite (on-device database)
• Material Design 3 UI components
• Android Print Framework (payment slips)
• SMSManager API (SMS slips)
• MPAndroidChart (collection trend charts)
• Git

• [Shift-wise milk collection entry] The operator selects a farmer and records each collection with quantity (1-decimal liters), fat %, SNF % and CLR reading, tagged to the morning or evening shift with an automatic timestamp. Invalid readings are rejected at entry so bad data never enters the ledger.
• [Fat/SNF two-axis rate chart (configurable)] The rate per liter is computed as base rate + (fat − reference fat) × fat premium + (SNF − reference SNF) × SNF premium — the same two-axis method dairy cooperatives use. The base rate, premiums and reference values are all editable, so the app matches any union's chart.
• [Automatic payment computation (implemented)] Every saved entry immediately shows its amount (liters × chart rate); cycle totals use quantity-weighted average fat and SNF, so a farmer's big and small pours are weighted correctly.
• [10-day payment-cycle billing (configurable)] At cycle close the app totals each farmer's liters, computes gross amount, subtracts recorded deductions such as feed advances, and produces the net payable. The cycle length (default 10 days) is configurable.
• [Per-farmer ledger (implemented)] Every entry is stored against the farmer with date, shift, readings, rate and amount; tapping a farmer opens the full cycle history — the audit trail that settles payment disputes.
• [Payment slips: print and SMS (implemented)] A payment slip with the entry-wise breakdown, totals, deductions and net payable is generated on-device — printable through the Android Print Framework or sent as an SMS to the farmer's registered number (needs a SIM with balance).
• [Offline-first local database] All records live in an on-device Room/SQLite database, so the app works through full network outages at rural centers. Cloud sync and multi-device backup are NOT implemented in the base build — they are documented future scope.

• Complete Android app source code (Kotlin) with the collection, ledger, rate-chart and billing modules
• Room/SQLite database schema and migration-ready data layer
• Configurable fat/SNF rate-chart module with default chart values
• Demo dataset (sample farmers, 10-day cycle entries) for testing and demonstration
• Build and setup guide for Android Studio
• Project report PDF (background, requirements, design, implementation, testing)
• PPT presentation for final review
• Viva Q&A preparation document (Android components, Room, rate-chart logic, offline design)