Login menu added

Author: burgereza

app/src/main/java/edu/sharif/homework1/LoginFragment.java

@@ -0,0 +1,84 @@
+package edu.sharif.homework1;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.navigation.fragment.NavHostFragment;
+
+import edu.sharif.homework1.databinding.FragmentLoginBinding;
+
+public class LoginFragment extends Fragment {
+
+    private FragmentLoginBinding binding;
+
+    private String username;
+    private String enteredPassword;
+
+    @Override
+    public View onCreateView(
+            LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState
+    ) {
+
+        binding = FragmentLoginBinding.inflate(inflater, container, false);
+        return binding.getRoot();
+
+    }
+
+
+    public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+
+        Button signUpButton = view.findViewById(R.id.button);
+        signUpButton.setOnClickListener(view1 -> {
+            NavHostFragment.findNavController(LoginFragment.this)
+                    .navigate(LoginFragmentDirections.actionLoginFragmentToSignupFragment());
+        });
+
+        binding.submitButton.setOnClickListener(view1 -> {
+
+            username = binding.usernameText.getText().toString();
+            enteredPassword = binding.passwordText.getText().toString();
+
+            if (username.isEmpty()) {
+                Toast.makeText(getContext(), "Please fill username field.",
+                        Toast.LENGTH_LONG).show();
+            } else {
+                User user = User.getUserByUsername(username);
+
+                if (user == null) {
+                    Toast.makeText(getContext(), "there is no user with this username.",
+                            Toast.LENGTH_LONG).show();
+                } else if (!user.getPassword().equals(enteredPassword)) {
+                    Toast.makeText(getContext(), "wrong username or password",
+                            Toast.LENGTH_LONG).show();
+                } else {
+                    if(user.getClass().equals(Student.class))
+                        openStudentPanelFragment();
+                    else openProfessorPanelFragment();
+                }
+            }
+        });
+    }
+
+
+    private void openStudentPanelFragment() {
+        NavHostFragment.findNavController(LoginFragment.this)
+                .navigate(LoginFragmentDirections.
+                        actionLoginFragmentToStudentPanelFragment(username));
+    }
+
+    private void openProfessorPanelFragment() {
+        NavHostFragment.findNavController(LoginFragment.this)
+                .navigate(LoginFragmentDirections.
+                                actionLoginFragmentToProfessorPanelFragment(username));
+    }
+
+
+}

app/src/main/res/layout/fragment_login.xml

@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".LoginFragment">
+
+
+    <LinearLayout
+        android:id="@+id/linearLayout2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <EditText
+            android:id="@+id/username_text"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:ems="10"
+            android:hint="@string/UserName"
+            android:inputType="text" />
+
+        <EditText
+            android:id="@+id/password_text"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:ems="10"
+            android:hint="@string/password"
+            android:inputType="textPassword" />
+
+        <Button
+            android:id="@+id/submit_button"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/login" />
+    </LinearLayout>
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="don't have an account? sign up"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.496"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/linearLayout2"
+        app:layout_constraintVertical_bias="0.459" />
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>