Login with MVVM in Android.

 grade-


    implementation "android.arch.lifecycle:extensions:1.1.1"

    implementation "android.arch.lifecycle:viewmodel:1.1.1"


   implementation 'com.squareup.retrofit2:retrofit:2.3.0'

    implementation 'com.squareup.retrofit2:converter-scalars:2.3.0'

    implementation 'com.squareup.retrofit2:converter-gson:2.2.0'



import com.google.gson.Gson;


import java.util.concurrent.TimeUnit;


import okhttp3.OkHttpClient;

import retrofit2.Retrofit;

import retrofit2.converter.gson.GsonConverterFactory;

import retrofit2.converter.scalars.ScalarsConverterFactory;


public class Api {



    public static final String BASE_URL = "";

    private static Retrofit retrofit = null;

    Gson gson = new Gson();


    public static Retrofit getClient() {


        if (retrofit==null) {

            OkHttpClient.Builder client = new OkHttpClient.Builder();

            client.connectTimeout(60, TimeUnit.SECONDS);

            client.readTimeout(60, TimeUnit.SECONDS);

            client.writeTimeout(60, TimeUnit.SECONDS);

            retrofit = new Retrofit.Builder()

                    .baseUrl(BASE_URL)

                    .client(client.build())

                    .addConverterFactory(ScalarsConverterFactory.create())

                    .addConverterFactory(GsonConverterFactory.create())

                    .build();

        }

        return retrofit;

    }

}



import okhttp3.ResponseBody;

import retrofit2.Call;

import retrofit2.Callback;

import retrofit2.http.Body;

import retrofit2.http.GET;

import retrofit2.http.HTTP;

import retrofit2.http.Headers;

import retrofit2.http.POST;

import retrofit2.http.Query;


public interface MyApi {


    @Headers("Content-Type: application/json")    // annotation that used with POST type request

    @POST("api/login") // specify the sub url for our base url

   // @HTTP(method = "POST", path = "/index.php/api/user/index_post", hasBody = true)

    public Call<String> login(@Body String body);

}






import android.view.View;

import androidx.lifecycle.MutableLiveData;

import androidx.lifecycle.ViewModel;


public class LoginViewModel extends ViewModel {

    public MutableLiveData<String> email = new MutableLiveData<>();

    public MutableLiveData<String> password = new MutableLiveData<>();

    private User user;

    private String successMessage = "Login successful";

    private String errorMessage = "Email or Password is not valid";

    private String toastMessage = null;


    private MutableLiveData<User> userMutableLiveData;


    public MutableLiveData<User> getUser() {


        if (userMutableLiveData == null) {

            userMutableLiveData = new MutableLiveData<>();

        }

        return userMutableLiveData;


    }


    public void onClick(View view) {


        User loginUser = new User(email.getValue(), password.getValue());


        userMutableLiveData.setValue(loginUser);


    }

}



import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;

import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Toast;


import org.json.JSONObject;

import java.util.Objects;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class Login extends AppCompatActivity {
    private LoginViewModel loginViewModel;
    ProgressDialog dialog;
    MyApi apiService= Api.getClient().create(MyApi.class);
    SharedPreferences pref ;
    SharedPreferences.Editor editor ;
    private ActivityLoginBinding binding;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_login);
   
        loginViewModel = ViewModelProviders.of(this).get(LoginViewModel.class);

        binding = DataBindingUtil.setContentView(Login.this, R.layout.activity_login);

        binding.setLifecycleOwner(this);

        binding.setViewModel(loginViewModel);
        loginViewModel.getUser().observe(this, new Observer<User>() {
            @Override
            public void onChanged(@Nullable User loginUser) {

                if (TextUtils.isEmpty(Objects.requireNonNull(loginUser).getEmail())) {
                    binding.email.setError("Enter an E-Mail Address");
                    binding.email.requestFocus();
                }
                else if (!loginUser.isEmailValid()) {
                    binding.email.setError("Enter a Valid E-mail Address");
                    binding.email.requestFocus();
                }
                else if (TextUtils.isEmpty(Objects.requireNonNull(loginUser).getPassword())) {
                    binding.password.setError("Enter a Password");
                    binding.password.requestFocus();
                }
                else if (!loginUser.isPasswordLengthGreaterThan5()) {
                    binding.password.setError("Enter at least 6 Digit password");
                    binding.password.requestFocus();
                }
                else {
                    makeLogin(loginUser.getEmail(),loginUser.password);
                }
            }
        });
    }


    private void makeLogin(String email,String password) {
        try {
            dialog=new ProgressDialog(this);
            dialog.setMessage("Loading...");
            dialog.setCancelable(false);
            dialog.show();
            //   System.out.println(user_email);
            // System.out.println(user_password);
            JSONObject paramObject = new JSONObject();
            paramObject.put("email", email);
            paramObject.put("password", password);
            paramObject.put("token", pref.getString("token",""));
            paramObject.put("deviceid", pref.getString("deviceid",""));
            System.out.println("data"+paramObject.toString());
            Call<String> call = apiService.login(String.valueOf(paramObject));
            call.enqueue(new Callback<String>() {
                @Override
                public void onResponse(@NonNull Call<String>call, @NonNull Response<String> response) {
                    dialog.dismiss();
                    System.out.println("data:::"+response.body());
                    try {
                      if(response.body()!=null){
                        JSONObject jsonResponse = new JSONObject(response.body());
                        String aJsonString = jsonResponse.getString("status");

                        if (aJsonString.equalsIgnoreCase("1")) {
                            String data = jsonResponse.getString("data");
                            JSONObject jsonResponse1 = new JSONObject(data);
                        
                            Toast.makeText(Login.this, "Login successfull!", Toast.LENGTH_LONG).show();
                                 Intent i = new Intent(Login.this, Dashboard.class);
                                 startActivity(i);
                                 finish();
                        } else {
                            Toast.makeText(Login.this, "Error!", Toast.LENGTH_LONG).show();
                        }
                    }
                      else
                      {
                          Toast.makeText(Login.this, "Error!", Toast.LENGTH_LONG).show();
                      }

                    }catch (Exception e){}
                }
                @Override
                public void onFailure(@NonNull Call<String>call, @NonNull Throwable t) {
                    // Log error here since request failed
                    System.out.println(t.toString());
                    dialog.dismiss();
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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