📝 Voice-Enabled To-Do List App

This project is a React Native To-Do List Application enhanced with Voice-to-Task and Voice Command Delete features.
It allows users to add tasks and delete tasks using voice commands for a seamless and hands-free experience.

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🚀 Features

• ✅ Add, search, toggle, and delete tasks with voice command
• 🗣️ Voice-to-Task functionality via Floating Action Button (FAB)
• ✂️ Automatic splitting of multiple dictated tasks (e.g. “Buy groceries and call mom”) into separate tasks
• 🌗 Dark and light mode toggle
• 🔔 Toast notifications when tasks are added
• 📅 Real-time task search by title, description, or date

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🧠 Voice-to-Task Implementation

When the Floating Action Button (FAB) is pressed, the app:

1. Activates the microphone using react-native-voice.
2. Transcribes spoken input into text.
3. Parses and splits the text using common connectors like and, then, also.
4. Adds each parsed segment as a new task to the task list.
5. Displays a toast notification for each new task.

📝 Example

Voice Input: Buy groceries and call mom and water the plants

Parsed Tasks:

• Buy groceries
• Call mom
• Water the plants

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🧹 Voice Command Delete Implementation

The app listens for delete commands like:

• “Delete task name”
• “Remove task name”
• “Clear task name”

When detected, the corresponding task is removed from the list, and a toast message is displayed.

🗣️ Example

Voice Input: Delete buy groceries

Action:
✅ Task “Buy groceries” is deleted.

🧠 API Choice: Speech-to-Text

For speech recognition, I used:

• react-native-voice — a lightweight and reliable speech-to-text library for React Native (iOS and Android).
• This API provides real-time transcription of the user’s speech and exposes event listeners for starting, stopping, and receiving recognized text.

Why this API:

• It works offline (depending on device support).
• It’s simple to integrate and requires no external cloud API key.
• It provides continuous listening mode which is ideal for short to-do voice inputs.

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🧠 Natural Language Parsing Approach

The app uses a rule-based natural language parsing logic to interpret spoken commands intelligently.

1. Preprocessing

• Convert the entire transcribed text to lowercase.
• Trim leading and trailing whitespaces.
• Normalize punctuation (e.g., remove trailing periods or commas).

2. Intent Detection

• If the text starts with a delete keyword such as:

  • delete
  • remove
  • clear

  → The parser extracts the text after the keyword as the task to delete.

  Example:

  • Input: delete call mom
  • Detected Intent: delete
  • Extracted Task: call mom
  • Action: remove task "Call mom" from the list.

3. Task Splitting (for Additions)

• If no delete keyword is found, the parser assumes the intent is to add tasks.

• The text is split into multiple tasks using common natural connectors:

  • and
  • then
  • commas ,
  • also

• The resulting array is cleaned:

  • Remove empty strings
  • Trim whitespaces for each segment
  • Capitalize the first letter for readability

  Example:

  • Input: buy groceries and call mom, then clean the kitchen
  • Split → ["buy groceries", "call mom", "clean the kitchen"]
  • Final → ["Buy groceries", "Call mom", "Clean the kitchen"]

4. Task Creation

• Each parsed segment is added to the task list context individually.
• A toast notification confirms each addition: ✅ Task added: "Buy groceries"

5. Future Parsing Enhancements

• Support for fuzzy matching on delete (e.g., “Delete groceries” deletes “Buy groceries”).
• Handling more complex phrases (e.g., “Remind me to...” or “Set a task for...”).
• Multi-language support for task commands.

🛠️ Tech Stack

• React Native (Expo)
• TypeScript
• React Navigation (Stack)
• AsyncStorage for local persistence
• Context API + Hooks for state management
• React Native Voice for Speech-To-Text

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Requirements

• Node.js (>=16)
• Expo CLI (optional) or use npx expo commands

Install & Run

1. Clone this repo
2. cd To-Do-List-App
3. npm install or yarn
4. npx expo start (or expo start)
5. Run on emulator or physical device using Expo Go