Architecture of Mobile Applications

1.7. Model-View-Intent (MVI): The Automated Factory Analogy

Imagine a highly automated factory.

• Model (The Machinery): This is where the actual work (data processing) happens. It follows precise instructions.
• View (The Control Panel): This is how the operator (user) interacts with the machinery. They can send instructions (Intents) through the panel.
• Intent (The Instructions): These are the specific instructions sent by the operator (user) to the machinery (Model).
• State (The Current Status): The machinery (Model) constantly updates its status (State), which is then displayed on the control panel (View).

How it works:

1. The operator (user) interacts with the control panel (View), sending an instruction (Intent) like "Start Production."
2. The instruction (Intent) is sent to the machinery (Model).
3. The machinery (Model) processes the instruction and updates its status (State).
4. The control panel (View) automatically updates to reflect the new status (State).

Benefits of MVI: Very strict and predictable flow of information. It's like a well-oiled machine, making it easier to understand what's happening and debug problems.

Key Differences Summarized:

• MVC: Focuses on separating data (Model), presentation (View), and user interaction (Controller).
• MVVM: Similar to MVC, but uses a ViewModel to make the View more passive and easier to manage.
• MVI: Emphasizes a unidirectional data flow, where the View expresses Intents, the Model updates State, and the View renders the State.