Android MVP for Beginners | Android MVP tutorial | Model-View-Presenter: Android | Android Architecture with MVP

Hello Friends,
          Today I am  going to share a very simple example of Android MVP.
In this sample I am using MVP pattern for network call and and user
form(login form) data validation which is mainly used in most of the android
application.

Model View Presenter divides application into three layers i.e: Model, View and Presenter.

1. Model: This handles the data part of our application
2. Presenter: It acts as a bridge that connects a Model and a View.
3. View: This is responsible for laying out views with the relevant data as instructed by the Presenter     

Note: The View never communicates with Model directly

1. LoginActivity.java 

view plainprint?

1. package android.developer.solutions.androidmvp.activity.login.view;  
2.   
3. import android.content.Intent;  
4. import android.developer.solutions.androidmvp.R;  
5. import android.developer.solutions.androidmvp.activity.home.view.HomeActivity;  
6. import android.developer.solutions.androidmvp.activity.login.interactor.LoginInteractorImpl;  
7. import android.developer.solutions.androidmvp.activity.login.presenter.ILoginPresenter;  
8. import android.developer.solutions.androidmvp.activity.login.presenter.LoginPresenterImpl;  
9. import android.os.Bundle;  
10. import android.support.v7.app.AppCompatActivity;  
11. import android.view.View;  
12. import android.widget.Button;  
13. import android.widget.EditText;  
14. import android.widget.ProgressBar;  
15.   
16. public class LoginActivity extends AppCompatActivity implements ILoginView {  
17.     EditText username;  
18.     EditText password;  
19.     ProgressBar progress;  
20.     Button button;  
21.     private ILoginPresenter presenter;  
22.   
23.     @Override  
24.     protected void onCreate(Bundle savedInstanceState) {  
25.         super.onCreate(savedInstanceState);  
26.         setContentView(R.layout.activity_login);  
27.         progress = (ProgressBar) findViewById(R.id.progress);  
28.         button = (Button) findViewById(R.id.btnLogin);  
29.         password = (EditText) findViewById(R.id.password);  
30.         username = (EditText) findViewById(R.id.username);  
31.         presenter = new LoginPresenterImpl(this, new LoginInteractorImpl());  
32.         button.setOnClickListener(new View.OnClickListener() {  
33.             @Override  
34.             public void onClick(View view) {  
35.                 presenter.validateCredentials(username.getText().toString(), password.getText().toString());  
36.             }  
37.         });  
38.     }  
39.   
40.     @Override  
41.     protected void onDestroy() {  
42.         presenter.onDestroy();  
43.         super.onDestroy();  
44.     }  
45.   
46.     @Override  
47.     public void showProgress() {  
48.         progress.setVisibility(View.VISIBLE);  
49.     }  
50.   
51.     @Override  
52.     public void hideProgress() {  
53.         progress.setVisibility(View.GONE);  
54.     }  
55.   
56.     @Override  
57.     public void setUsernameError() {  
58.         username.setError("Invalid user name");  
59.     }  
60.   
61.     @Override  
62.     public void setPasswordError() {  
63.         password.setError("Invalid password");  
64.     }  
65.   
66.     @Override  
67.     public void navigateToHome() {  
68.         startActivity(new Intent(this, HomeActivity.class));  
69.         finish();  
70.     }  
71. }  

package android.developer.solutions.androidmvp.activity.login.view;

import android.content.Intent;
import android.developer.solutions.androidmvp.R;
import android.developer.solutions.androidmvp.activity.home.view.HomeActivity;
import android.developer.solutions.androidmvp.activity.login.interactor.LoginInteractorImpl;
import android.developer.solutions.androidmvp.activity.login.presenter.ILoginPresenter;
import android.developer.solutions.androidmvp.activity.login.presenter.LoginPresenterImpl;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;

public class LoginActivity extends AppCompatActivity implements ILoginView {
    EditText username;
    EditText password;
    ProgressBar progress;
    Button button;
    private ILoginPresenter presenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        progress = (ProgressBar) findViewById(R.id.progress);
        button = (Button) findViewById(R.id.btnLogin);
        password = (EditText) findViewById(R.id.password);
        username = (EditText) findViewById(R.id.username);
        presenter = new LoginPresenterImpl(this, new LoginInteractorImpl());
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                presenter.validateCredentials(username.getText().toString(), password.getText().toString());
            }
        });
    }

    @Override
    protected void onDestroy() {
        presenter.onDestroy();
        super.onDestroy();
    }

    @Override
    public void showProgress() {
        progress.setVisibility(View.VISIBLE);
    }

    @Override
    public void hideProgress() {
        progress.setVisibility(View.GONE);
    }

    @Override
    public void setUsernameError() {
        username.setError("Invalid user name");
    }

    @Override
    public void setPasswordError() {
        password.setError("Invalid password");
    }

    @Override
    public void navigateToHome() {
        startActivity(new Intent(this, HomeActivity.class));
        finish();
    }
}

2. ILoginView.java

view plainprint?

1. package android.developer.solutions.androidmvp.activity.login.view;  
2.   
3. /** 
4.  * Created by Mukesh on 12/16/2017. 
5.  * androiddevelopersolutions.com 
6.  */  
7. public interface ILoginView {  
8.     void showProgress();  
9.     void hideProgress();  
10.     void setUsernameError();  
11.     void setPasswordError();  
12.     void navigateToHome();  
13. }  

package android.developer.solutions.androidmvp.activity.login.view;

/**
 * Created by Mukesh on 12/16/2017.
 * androiddevelopersolutions.com
 */
public interface ILoginView {
    void showProgress();
    void hideProgress();
    void setUsernameError();
    void setPasswordError();
    void navigateToHome();
}

Download complete code from here

Hope this will helps some one.
Enjoy Coding............ :)