Blood Pressure Log Android App with Readings Chart and Doctor Report Export

Blood Pressure Log is an Android app for people who already own a blood pressure cuff and want a record of their readings. The user types in each measurement — systolic pressure, diastolic pressure and pulse — exactly as shown on their own cuff device, together with the date and time and an optional note such as "after morning walk", and the app stores the entry on the phone. Over days and weeks, the readings appear as a list and as a chart of systolic and diastolic values against time, with each entry flagged against common reference bands so unusual values stand out at a glance. Averages are shown separately for morning and evening readings, and the user can export a printable summary — overall averages, the highest and lowest readings, and the full list — to take to a doctor's appointment. The app never measures blood pressure itself: it only records, organises and presents numbers the user enters.

The app works end to end as a manual log: the user reads the numbers off their own cuff device, types them into the app, and the app takes over from there. Each entry is validated, stored in a local database on the phone, and immediately reflected in three places — the reading list, the trend chart and the report view. Flags are computed from the stored values at display time, so correcting a reading automatically corrects its flag, its position on the chart and every average it feeds into. Averages are grouped by the morning/evening slot recorded with each entry, which keeps the two halves of the day distinct. When the user opens the doctor report, the app aggregates the stored readings into a summary and hands it to the Android print framework, which produces the printable document. No account, server or internet connection is involved at any step.

1. The user measures their blood pressure with their own cuff device and opens the app.
2. The user taps Add reading and enters systolic pressure, diastolic pressure, pulse, date and time, the morning/evening slot and an optional note.
3. The app validates the entry — rejecting empty fields and values outside the accepted ranges — before saving anything.
4. The validated entry is stored in the local Room database on the phone, with no account or server involved.
5. The reading list refreshes newest-first, and the entry's category flag is computed from its systolic and diastolic values.
6. The chart re-plots with the new point in chronological order, keeping morning and evening readings as separate points.
7. Morning, evening and overall averages are recomputed from the stored readings.
8. The user opens the Doctor Report view, reviews the summary, and prints it or saves it as a PDF through the Android print framework.

Tech stack:

• Kotlin
• Android Studio
• Jetpack Compose
• Room database
• Material Design 3
• MPAndroidChart · charting library
• Android Print framework
• Git

Blood Pressure Log gives the user four core capabilities: fast, validated entry of readings from their own cuff device; a searchable, editable history of every reading; a chart that shows systolic and diastolic trends over time; and a printable doctor report that summarises the whole record. Category flags sit on top of every entry so unusual values are visible without opening each record, and morning and evening averages are kept separate because a single daily average hides the difference between the two halves of the day. Everything is stored locally on the phone, so the log works without an account and without an internet connection. Optional additions and future improvements are labelled as such below, and are never described as part of the base build. Builder note from the demo build: plotting every reading on one daily average hid the gap between morning and evening values in the sample week, so the chart keeps the two slots as separate points.

• [Reading entry with validation] (Implemented) The user enters systolic pressure, diastolic pressure, pulse, date and time, a morning/evening slot and an optional note; the app rejects empty or out-of-range values before anything is saved.
• [Editable reading history] (Implemented) Every reading appears in a newest-first list with its flag and note, and any entry can be corrected or deleted when a value was typed in wrong.
• [Readings chart over time] (Implemented) Systolic and diastolic values are plotted as two lines against the date of each reading, with a 120 mmHg reference line, so trends across weeks are visible at a glance.
• [Category flagging] (Implemented) Each reading is flagged against common reference bands — Normal, Elevated, High Stage 1, High Stage 2 and Low — purely as a visual guide, never as a diagnosis.
• [Morning and evening averages] (Implemented) Averages are computed separately for morning and evening readings, so a morning rise is not averaged away by lower evening values.
• [Doctor report export] (Implemented) A summary view collects the overall average, morning and evening averages, highest and lowest readings and the full list, and exports it through the Android print framework for printing or saving as a PDF.
• [Measurement reminders] (Optional customization) Daily reminders to take a reading can be added on request; reminders are not part of the base build.
• [Cloud backup and sync] (Future scope) Backing up the log to the cloud and syncing it across devices is a possible later improvement, not included in the base build.

• Complete Android app source code (Kotlin, Jetpack Compose, Room)
• Working demo build with sample readings for testing
• Setup and build instructions for Android Studio
• Project report PDF (background, design, implementation, testing, limitations)
• PPT presentation for final review
• Viva Q&A preparation document (Android components, Room, charting, print framework)