add fitur login

app/src/main/java/com/example/yourcashiertest/activities/LoginActivity.java

 package com.example.yourcashiertest.activities;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProvider;
 
 import android.content.Context;
 import android.content.Intent;
@@ -10,9 +12,13 @@ import android.view.View;
 import android.widget.Toast;
 
 import com.example.yourcashiertest.R;
+import com.example.yourcashiertest.models.User;
+import com.example.yourcashiertest.viewmodels.UserViewModel;
 import com.google.android.material.button.MaterialButton;
 import com.google.android.material.textfield.TextInputEditText;
 
+import java.util.List;
+
 public class LoginActivity extends AppCompatActivity {
     TextInputEditText etUsername, etPassword;
     MaterialButton btnLogin;
@@ -23,6 +29,8 @@ public class LoginActivity extends AppCompatActivity {
 //    public static final String my_shared = "session_status";
     private PrefManager prefManager;
 
+    UserViewModel viewModel;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -38,6 +46,8 @@ public class LoginActivity extends AppCompatActivity {
         etUsername = findViewById(R.id.etUsername);
         btnLogin = findViewById(R.id.btnLogin);
 
+        viewModel = new ViewModelProvider(this, new ViewModelProvider.NewInstanceFactory()).get(UserViewModel.class);
+
         btnLogin.setOnClickListener(view -> {
 
             if(etUsername.getText().toString().length() == 0 || etPassword.getText().toString().length() == 0){
@@ -47,10 +57,23 @@ public class LoginActivity extends AppCompatActivity {
             }else if(etPassword.getText().toString().length() < 8) {
                 etPassword.setError("Password length cannot be less than 8 characters");
             }else{
-                startActivity(new Intent(LoginActivity.this, MainActivity.class)
-                        .putExtra(DATA_LOGIN, etUsername.getText().toString()));
-                finish();
+                viewModel.setListUser();
+                checkLogin();
+            }
+        });
+
+    }
+
+    private void checkLogin() {
+        viewModel.getListUser().observe(this, users -> {
+            for (int i = 0; i < users.size(); i++){
+                if (users.get(i).getEmail().equals(etUsername.getText().toString())
+                        && users.get(i).getPassword().equals(etPassword.getText().toString())){
+                    startActivity(new Intent(LoginActivity.this, MainActivity.class)
+                            .putExtra(DATA_LOGIN, users.get(i).getFullName()));
+                }
             }
+//            Toast.makeText(getApplication(), "Username or password wrong", Toast.LENGTH_LONG).show();
         });
     }
 

app/src/main/java/com/example/yourcashiertest/models/ResponseUser.java

+package com.example.yourcashiertest.models;
+
+import java.util.List;
+import com.google.gson.annotations.SerializedName;
+
+public class ResponseUser{
+
+	@SerializedName("data")
+	private List<User> user;
+
+	@SerializedName("message")
+	private String message;
+
+	@SerializedName("status")
+	private boolean status;
+
+	public void setData(List<User> data){
+		this.user = data;
+	}
+
+	public List<User> getData(){
+		return user;
+	}
+
+	public void setMessage(String message){
+		this.message = message;
+	}
+
+	public String getMessage(){
+		return message;
+	}
+
+	public void setStatus(boolean status){
+		this.status = status;
+	}
+
+	public boolean isStatus(){
+		return status;
+	}
+}
\ No newline at end of file

app/src/main/java/com/example/yourcashiertest/models/User.java

 package com.example.yourcashiertest.models;
 
+import android.os.Parcel;
+import android.os.Parcelable;
+
 import com.google.gson.annotations.SerializedName;
 
-public class User{
+public class User implements Parcelable {
 
 	@SerializedName("password")
 	private String password;
@@ -16,6 +19,29 @@ public class User{
 	@SerializedName("email")
 	private String email;
 
+	public User(Parcel in) {
+		password = in.readString();
+		fullName = in.readString();
+		phoneNumber = in.readString();
+		email = in.readString();
+	}
+
+	public static final Creator<User> CREATOR = new Creator<User>() {
+		@Override
+		public User createFromParcel(Parcel in) {
+			return new User(in);
+		}
+
+		@Override
+		public User[] newArray(int size) {
+			return new User[size];
+		}
+	};
+
+	public User() {
+
+	}
+
 	public void setPassword(String password) {
 		this.password = password;
 	}
@@ -47,4 +73,17 @@ public class User{
 	public String getEmail(){
 		return email;
 	}
+
+	@Override
+	public int describeContents() {
+		return 0;
+	}
+
+	@Override
+	public void writeToParcel(Parcel dest, int flags) {
+		dest.writeString(password);
+		dest.writeString(fullName);
+		dest.writeString(phoneNumber);
+		dest.writeString(email);
+	}
 }
\ No newline at end of file

app/src/main/java/com/example/yourcashiertest/services/UserService.java

 package com.example.yourcashiertest.services;
 
+import com.example.yourcashiertest.models.ResponseUser;
 import com.example.yourcashiertest.models.User;
 
+import java.util.List;
+
 import retrofit2.Call;
 import retrofit2.http.Body;
+import retrofit2.http.GET;
 import retrofit2.http.Headers;
 import retrofit2.http.POST;
 
 public interface UserService {
 
+    @GET("v1/customer")
+    Call<ResponseUser> getAllUser();
+
     @Headers("Content-Type: application/json")
     @POST("v1/customer")
     Call<User> registerUser(@Body User user);

app/src/main/java/com/example/yourcashiertest/viewmodels/UserViewModel.java

 package com.example.yourcashiertest.viewmodels;
 
+import android.util.Log;
+
 import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.ViewModel;
 
 import com.example.yourcashiertest.clients.ApiClient;
+import com.example.yourcashiertest.models.ResponseUser;
 import com.example.yourcashiertest.models.User;
 import com.example.yourcashiertest.services.UserService;
 
@@ -18,6 +21,11 @@ public class UserViewModel extends ViewModel {
 
     public final String BASE_URL = "https://your-cashier.herokuapp.com/api/";
 
+
+    public MutableLiveData<List<User>> getListUser(){
+        return this.listUser;
+    }
+
     public void registrasi(User user){
         ApiClient.client(UserService.class, BASE_URL).registerUser(user)
                 .enqueue(new Callback<User>() {
@@ -32,4 +40,20 @@ public class UserViewModel extends ViewModel {
             }
         });
     }
+
+    public void setListUser(){
+        ApiClient.client(UserService.class, BASE_URL).getAllUser().enqueue(new Callback<ResponseUser>() {
+            @Override
+            public void onResponse(Call<ResponseUser> call, Response<ResponseUser> response) {
+                listUser.setValue(response.body().getData());
+                Log.d("user", String.valueOf(response.body().getData()));
+            }
+
+            @Override
+            public void onFailure(Call<ResponseUser> call, Throwable t) {
+
+            }
+        });
+    }
+
 }