Simple Android Todo List App

Purpose

This Android project demonstrates fundamental Android app development concepts, focusing on task management functionality. It's great for beginners interested in learning:

• UI Design: Basic layout creation and views (Floating Action Button).
• Fragments: Using fragments for modular components within an activity.
• Fragment Communication: Implementing communication between fragments using interfaces.
• Dialogs: Creating custom dialogs for user input and interactions.
• Data Persistence: Using SharedPreferences for simple data storage.

Features

• Add Tasks: Create new todo list items.
• Add Subtasks: Add subtasks to a main task.
• Edit Tasks: Modify existing task descriptions.
• Delete Tasks: Remove tasks using a swipe gesture.
• Tablet Optimization: Adapt the UI for tablet displays.
• Welcome Tips: Provide initial guidance for new users.

How To Use

1. Import the project: Import the project into Android Studio.
2. Build and run: Build and run the app on an Android device or emulator.

Understanding the Code

• MainActivity.java:

  • Handles the main activity lifecycle.
  • Checks for tablet layout and adjusts UI accordingly.
  • Manages the Floating Action Button for adding tasks/subtasks.
  • Implements the GetIdListener interface for receiving task information from fragments.
  • Handles welcome tips using SharedPreferences.

• SubTaskActivity.java:

  • Handles the display of subtasks related to a selected main task.
  • Uses a Floating Action Button to trigger the AddTaskDialog for adding new subtasks.

• AddTaskDialog.java:

  • A custom dialog used for:
    • Adding new tasks
    • Adding new subtasks
    • Updating existing tasks
    • Updating existing subtasks
  • Interacts with a DialogTaskViewModel (for data insertion, updates, and potentially retrieval).
  • Handles its own state restoration using onSaveInstanceState.

• SubTaskListFragment.java:

  • Displays a list of subtasks using a RecyclerView.
  • Observes LiveData from the SubTaskViewModel to update the list.
  • Implements the swipe-to-delete functionality using ItemTouchHelper.
  • Provides a callback (onUpdateSubTaskLongPressListener) for handling the update of subtasks.

• TaskListFragment.java:

  • Displays the list of main tasks using a RecyclerView.
  • Observes LiveData from the TaskViewModel to update the list.
  • Implements swipe-to-delete for tasks, including a confirmation dialog.
  • Triggers the SubTaskActivity when an item is selected, and sends the task information using the GetIdListener interface.
  • Provides a callback (onUpdateTaskLongPressListener) for handling the update of tasks.

Notes

• This app offers a good foundation for further development. Consider adding:
  • More robust data storage (using a API Call).
  • Reminders and due dates.
  • Task sorting and filtering.