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@JDPekham, why do you say 'You cannot instantiate an activity without talking to your layout/view'? Instantiating an activity does not require talking to views, in fact talking to views is by no means a part of the Activity instantiation. You CAN (but do not have to) call various Activity methods that interact with your views when and if you see fit. Second question: Assuming Activity is intended to take the 'controller' role (I believe many Android devs see it that way) why not talk to your views from the Activity? – user1545072 Oct 1 '13 at 7:19. There is no universally unique MVC pattern.
Jan 6, 2018 - Modelo Vista Controlador Java Netbeans Tutorial Pdf. If you've programmed with graphical user interface (GUI) libraries in the past 10 years. I have basic knowledge of Java Programming and I have to make a Java. That helps with this This Library Helps to create projects that follow mvc standards. JavaFX is intended to replace Swing as the standard GUI library for Java SE, but.
MVC is a concept rather than a solid programming framework. You can implement your own MVC on any platform. As long as you stick to the following basic idea, you are implementing MVC:.
Model: What to render. View: How to render. Controller: Events, user input Also think about it this way: When you program your model, the model should not need to worry about the rendering (or platform specific code). The model would say to the view, I don't care if your rendering is Android or iOS or Windows Phone, this is what I need you to render.
The view would only handle the platform-specific rendering code. This is particularly useful when you use to share the model in order to develop cross-platform applications. After some searching, the most reasonable answer is the following: MVC is already implemented in Android as:.
View = layout, resources and built-in classes like Button derived from android.view.View. Controller = Activity. Model = the classes that implement the application logic (This by the way implies no application domain logic in the activity.) The most reasonable thing for a small developer is to follow this pattern and not to try to do what Google decided not to do. PS Note that Activity is sometimes restarted, so it's no place for model data (the easiest way to cause a restart is to omit android:configChanges='keyboardHidden orientation' from the XML and turn your device). EDIT We may be talking about MVC, but it will be so to say FMVC, Framework-Model-View-Controller.
The Framework (the Android OS) imposes its idea of component life cycle and related events, and in practice the Controller ( Activity/ Service/ BroadcastReceiver) is first of all responsible for coping with these Framework-imposed events (such as onCreate). Should user input be processed separately? Even if it should, you cannot separate it, user input events also come from Android. Anyway, the less code that is not Android-specific you put into your Activity/ Service/ BroadcastReceiver, the better. Ever heard of observers?
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The best separation Iv found so far is when 1. Controller has only model instance, 2. Model has no knowladge of controller or view but view can register as model observer (so model kinda know about view but he doesnt know who it is and he doesnt care) - when model is done with loading data, he notifies all observers (usually 1) and 3. View has only model instance to pull data out of it. This way there are only 2 dependecies for all MVC framework.
I think 2 is minimum so it should be the best layout. – Apr 22 '15 at 12:35. There is no single MVC pattern you could obey to. MVC just states more or less that you should not mingle data and view, so that e.g.
Views are responsible for holding data or classes which are processing data are directly affecting the view. But nevertheless, the way Android deals with classes and resources, you're sometimes even forced to follow the MVC pattern. More complicated in my opinion are the activities which are responsible sometimes for the view, but nevertheless act as an controller in the same time. If you define your views and layouts in the XML files, load your resources from the res folder, and if you avoid more or less to mingle these things in your code, then you're anyway following an MVC pattern. MVC- Architecture on Android Its Better to Follow Any MVP instead MVC in android. But still according to the answer to the question this can be solution Description and Guidelines Controller - Activity can play the role. Use an application class to write the global methods and define, and avoid static variables in the controller label Model - Entity like - user, Product, and Customer class.
View - XML layout files. ViewModel - Class with like CartItem and owner models with multiple class properties Service - DataService- All the tables which have logic to get the data to bind the models - UserTable, CustomerTable NetworkService - Service logic binds the logic with network call - Login Service Helpers - StringHelper, ValidationHelper static methods for helping format and validation code. SharedView - fragmets or shared views from the code can be separated here AppConstant - Use the Values folder XML files for constant app level NOTE 1: Now here is the piece of magic you can do.
Once you have classified the piece of code, write a base interface class like, IEntity and IService. Declare common methods. Now create the abstract class BaseService and declare your own set of methods and have separation of code. NOTE 2: If your activity is presenting multiple models then rather than writing the code/logic in activity, it is better to divide the views in fragments. Then it's better.
So in the future if any more model is needed to show up in the view, add one more fragment. NOTE 3: Separation of code is very important. Every component in the architecture should be independent not having dependent logic. If by chance if you have something dependent logic, then write a mapping logic class in between. This will help you in the future. Android's MVC pattern is (kind-of) implemented with their classes. They replace a controller with an 'adapter.'
The description for the adapter states: An Adapter object acts as a bridge between an AdapterView and the underlying data for that view. I'm just looking into this for an Android application that reads from a database, so I don't know how well it works yet. However, it seems a little like Qt's Model-View-Delegate architecture, which they claim is a step up from a traditional MVC pattern. At least on the PC, Qt's pattern works fairly well.