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androidarchitecturemvp
Mangooxx
Mangooxx

Reputation: 1433

Android MVP-Architecture How to make Database Calls in the Model with SQLiteHelper

I'm currently working on an Android App and i choosed the MVP-Arhitecture. My Problem is right now, that i need to read and write something from the Database in the Model, but therefor you need a reference to the Context and that is in the View. I want to know, how to get the Context from the View to the Model without breaking the MVP-Architecture (if it is possible).

Thx!!!

Upvotes: 2

Views: 3521

Answers (1)

Blundell
Blundell

Reputation: 76536

Something has to create the model and the presenter i.e.:

 new MyModel();
 new Presenter();

Usually this is the Activity

 @Override
 public void onCreate(Bundle savedState) {
      Model model = new MyModel();
      Presenter presenter = new Presenter(model, this); // this being the View
 }

If you are using a database inside of your model you want to use a dependency to do this, maybe called DatabaseReader

 @Override
 public void onCreate(Bundle savedState) {
      DatabaseReader db = new DatabaseReader(this); // this being context
      Model model = new MyModel(db);
      Presenter presenter = new Presenter(model, this); // this being the View
 }

Now you have a class called DatabaseReader that has a Context passed to it through the constructor so you can do "database things", and this class itself is used by the model.

 public class DatabaseReader {

     private final Context context;


     public DatabaseReader(Context context) {
         this.context = context;
     }
 }

and

 public class MyModel implements Model {

     private final DatabaseReader db;

     public MyModel(DatabaseReader db) {
         this.db = db;
     }


 }

Upvotes: 8

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