Daily Hydration Tracker Android App with Glass-Size Presets and Intake Goals

A daily hydration tracker Android app is an app that records each glass of water a person drinks, adds the amounts together for the day, and shows progress against a daily intake goal. This app does that with one-tap glass-size presets, a daily progress ring, and a simple history, so logging a drink takes seconds rather than a typed entry. Many people intend to drink steadily through the day but lose count after the first few glasses, and paper notes or mental tallies are easy to abandon. Existing reminder apps often bury logging behind menus or ask for exact millilitres every time, which adds friction at exactly the moment a drink is finished. This project removes that friction: pick a glass size once, tap once per drink, and the day's total, remaining amount, and weekly pattern stay visible without extra effort.

Using the app follows one continuous loop from opening it in the morning to reviewing the week at night. The user sees the day's goal and progress first, logs each drink with a preset size in a single tap, and watches the ring and remaining amount update immediately. Reminders arrive only inside the active-hours window the user chose, so nudges do not continue late at night. At any point the user can open history, check a past day, or fix a wrong entry, and the totals recalculate from the stored entries rather than from a typed running total. Each day starts fresh at midnight with the previous day moved into the weekly history, and reaching the goal shows a quiet confirmation instead of a further prompt. The steps below describe that loop exactly as the demo implements it, from first launch to weekly review.

1. On first launch, the user confirms or changes the daily goal, starting from the 2,000 ml design-target default, and sets a reminder interval and active-hours window.
2. The home screen shows the progress ring for today: total logged so far, amount remaining, and percentage of the goal reached.
3. To log a drink, the user taps a glass-size preset (150 ml, 200 ml, 250 ml or 500 ml) and then the Log button; the entry is stored with the current time.
4. The ring, remaining amount, glass count and today's log update immediately from the stored entries, with no manual total to maintain.
5. At the chosen interval inside active hours, a local reminder fires; outside active hours, or with reminders off, no nudge appears.
6. At midnight the day resets: the finished day moves into the 7-day history and a new day starts at 0 ml against the same goal.
7. From history, the user opens any past day to see its entries, edits or deletes a wrong entry, and the totals for that day recalculate.
8. From the weekly chart, the user compares the last 7 daily totals against the goal and spots patterns before adjusting the goal or reminder interval.

Tech stack:

• Kotlin · Android SDK
• Jetpack Compose (UI)
• Room database (local storage)
• WorkManager · AlarmManager (local reminders)
• Material 3 design components
• Android Studio
• Git

The app is built around four capabilities that carry the whole experience: one-tap logging with glass-size presets, a daily goal ring that shows progress at a glance, a dated history that can correct mistakes, and reminders that respect active hours. Together they keep the interaction under a few seconds per drink while still giving the user a record they can trust and review. The remaining features support those four: a weekly chart for spotting patterns, an editable daily goal, local storage that works without an account, and clear separation between what is implemented, what is optional, and what is left as future scope. Nothing in the list below requires a server, a wearable, or a paid service. The demo built for this listing proves the core loop directly: tapping a preset updates the ring, the remaining amount, and the glass count in the same interaction, with no page reload and no placeholder numbers.

• [One-tap glass-size presets] Four preset sizes — 150 ml, 200 ml, 250 ml and 500 ml — so logging a drink is one tap after selecting a size, with 250 ml selected by default in the demo build.
• [Daily goal ring] A progress ring shows the day's total against the user-set goal, with the amount remaining and the percentage reached visible beside it.
• [Dated intake history] Every entry keeps its date, time and glass size, and past days can be opened to review exactly what was logged.
• [Edit and delete entries] A mistaken entry can be edited or removed, and the day's total recalculates from the stored entries rather than from a typed running total.
• [Configurable reminders] Local reminders fire at a chosen interval inside a user-set active-hours window, and switching reminders off stops all nudges while logging keeps working.
• [7-day weekly chart] Daily totals for the last 7 days are charted against the goal, so patterns such as low-intake afternoons are visible at a glance.
• [Editable daily goal] The goal is a single user-set number, with 2,000 ml as the design-target default, and changing it recalculates the remaining amount immediately.
• [Local storage, no account] Entries live in the app's on-device database, so the core app works without sign-in, a server, or an internet connection. (Optional: cloud backup and sync, not part of the core build. Future scope: wearable integration and intake suggestions.)

• Working Android app (tracker, presets, goal ring, history, reminders)
• Single-file working demo of the app's UI for review before delivery
• Project report PDF (background, design, methodology, limitations)
• PPT presentation for final review
• Viva Q&A preparation document (local storage, notifications, UI state)
• Abstract PDF matching the page