Backendless Homework

//-------- JAVA Files -------------------
//-------------- MainActivity.java -------------

package com.sgl.mybackendless;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

import com.backendless.Backendless;
import com.backendless.async.callback.AsyncCallback;
import com.backendless.exceptions.BackendlessFault;

public class MainActivity extends AppCompatActivity {

    Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setPointer();
    }

    private void setPointer() {
        this.context = this;
        Backendless.initApp(context, Defaults.APPLICATION_ID, Defaults.API_KEY);
        loadClasses();
        findViewById(R.id.btn_login).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(context, LoginActivity.class));
            }
        });

        findViewById(R.id.btn_register).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(context, RegisterActivity.class));
            }
        });
    }

    private void loadClasses() {
        Class classObj = new Class();
        Courses course = new Courses();
        for(int i = 0; i < 3; i++) {
            classObj.setClassName(Defaults.CLASSES[i]);
            classObj.setClassDean(Defaults.DEANS[i]);
            classObj.setClassID((i + 1) * 10);
            Backendless.Data.of(Class.class).save(classObj, new AsyncCallback<Class>() {
                @Override
                public void handleResponse(Class response) {
                    Log.i("Success", "handleResponse: Success saving " + response.getClassName());
                }

                @Override
                public void handleFault(BackendlessFault fault) {
                    Log.e("Error", "Class save failed: " + fault.getMessage());
                }
            });
            for(int j = 0; j < 3; j++) {
                course.setClassID((i + 1) * 10);
                course.setCourseID(100 * (i + 1) + j);
                course.setCourseName(Defaults.COURSES[3 * i + j]);
                String semester = Math.random()*2 > 1 ? "A" : "B";
                course.setSemester(semester);
                Backendless.Data.of(Courses.class).save(course, new AsyncCallback<Courses>() {
                    @Override
                    public void handleResponse(Courses response) {
                        Log.i("Success", "handleResponse: Success saving " + response.getCourseName());
                    }

                    @Override
                    public void handleFault(BackendlessFault fault) {
                        Log.e("Error course", "Course save failed: " + fault.getMessage());
                    }
                });
            }
        }
    }
}

//----------------- RegisterActivity.java -----------------------------

package com.sgl.mybackendless;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.backendless.Backendless;
import com.backendless.BackendlessUser;
import com.backendless.async.callback.AsyncCallback;
import com.backendless.exceptions.BackendlessFault;

import java.util.HashMap;
import java.util.List;

public class RegisterActivity extends AppCompatActivity {

    EditText firstName, lastName, email, password, className;
    Context context;
    BackendlessUser newUser;
    int classId;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        setPointer();
    }

    private void setPointer() {
        this.context = this;

        findViewById(R.id.btn_register).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                registerUser();
            }
        });
    }

    private void buildUserData() {
        newUser = new BackendlessUser();
        final HashMap<String, Object> props = new HashMap<>();
        props.put("firstName", firstName.getText().toString());
        props.put("lastName", lastName.getText().toString());
        props.put("password", password.getText().toString());
        props.put("email", email.getText().toString());
        props.put("classID", classId);
        props.put("className", className.getText().toString());
        newUser.setProperties(props);
    }

    private void registerUser() {
        firstName = findViewById(R.id.input_first_name);
        lastName = findViewById(R.id.input_last_name);
        email = findViewById(R.id.input_email);
        password = findViewById(R.id.input_password);
        className = findViewById(R.id.input_class);
        classId = 9;
        new retrieveClassIdtask().execute(className.getText().toString());

    }

    private class retrieveClassIdtask extends AsyncTask<String, Void, Void> {

        @Override
        protected Void doInBackground(String... strings) {
            try {
                List<Class> classes = Backendless.Data.of(Class.class).find();
                for (Class c : classes) {
                    if(c.getClassName().equals(strings[0])) {
                        classId = Integer.parseInt(c.getClassID().toString());
                    }
                }
            } catch (Exception e) {
                Log.e("Error", "doInBackground: " + e.getMessage());
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            if(classId == 9) {
                Toast.makeText(context, "Bad input - Class Name", Toast.LENGTH_LONG).show();
            } else {
                Log.i("Register Error", "onPostExecute: Class ID and name: " + classId + "; " + className.getText().toString());
                buildUserData();
                Backendless.UserService.register(newUser, new AsyncCallback<BackendlessUser>() {
                    @Override
                    public void handleResponse(BackendlessUser response) {
                        String fullName = firstName.getText().toString() + " " + lastName.getText().toString();
                        Toast.makeText(context, "Hi " + fullName + ", you are now registered!", Toast.LENGTH_SHORT).show();
                        Intent intent = new Intent(context, StudentActivity.class);
                        intent.putExtra("username", firstName.getText().toString());
                        intent.putExtra("cId", classId);
                        intent.putExtra("cName", className.getText().toString());
                        Log.i("CLASS ID", "handleResponse: " + classId);
                        startActivity(intent);
                    }

                    @Override
                    public void handleFault(BackendlessFault fault) {
                        Log.e("Register Error", "handleFault2: " + fault.getMessage());
                    }
                });
            }
        }
    }
}

// ---------------- LoginActivity.com ---------------------------

package com.sgl.mybackendless;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.backendless.Backendless;
import com.backendless.BackendlessUser;
import com.backendless.async.callback.AsyncCallback;
import com.backendless.exceptions.BackendlessFault;
import com.backendless.persistence.DataQueryBuilder;

import java.util.List;
import java.util.Map;

public class LoginActivity extends AppCompatActivity {

    Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        setPointer();
    }

    private void setPointer() {
        this.context = this;
        findViewById(R.id.btn_login).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                loginUser();
            }
        });
        findViewById(R.id.txtToRegisterPage).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(context, RegisterActivity.class));
            }
        });
    }

    private void loginUser() {
        String uEmail = ((EditText)findViewById(R.id.input_email)).getText().toString();
        String uPass = ((EditText)findViewById(R.id.input_password)).getText().toString();

        Backendless.UserService.login(uEmail, uPass, new AsyncCallback<BackendlessUser>() {
            @Override
            public void handleResponse(BackendlessUser response) {
                Intent intent = new Intent(context, StudentActivity.class);
                startActivity(intent);
            }

            @Override
            public void handleFault(BackendlessFault fault) {
                Toast.makeText(context, "Incorrect email or password!", Toast.LENGTH_LONG).show();
            }
        });
    }
}

//---------------------- StudentActivity.java ------------------------------

package com.sgl.mybackendless;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.TextView;

import com.backendless.Backendless;
import com.backendless.async.callback.AsyncCallback;
import com.backendless.exceptions.BackendlessFault;

import java.util.ArrayList;
import java.util.List;

public class StudentActivity extends AppCompatActivity {

    Context context;
    TextView titles;
    ArrayList<String> cList;
    String firstName, clName;
    ListView coursesList;
    int cId;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_student);
        setPointer();
    }

    private void setPointer() {
        // Initializing global variables
        this.context = this;
        titles = findViewById(R.id.txtTable);
        titles.setVisibility(View.INVISIBLE);
        cList = new ArrayList<>();
        Bundle extras = getIntent().getExtras();
        if(extras == null) {
            // Coming from the LoginActivity
            firstName = Backendless.UserService.CurrentUser().getProperty("firstName").toString();
            clName = Backendless.UserService.CurrentUser().getProperty("className").toString();
            cId = Integer.parseInt(Backendless.UserService.CurrentUser().getProperty("classID").toString());
        } else {
            // Coming from the RegisterActivity
            firstName = extras.getString("username");
            clName = extras.getString("cName");
            cId = extras.getInt("cId");
        }
        // Set the welcome title
        ((TextView)findViewById(R.id.txtWelcome)).setText("hey " + firstName + "\nWelcom to the " + clName + " class");
        loadData();
    }

    private void loadData() {
        /* Retrieving data from the courses table in Backendless using a non-blocking method */
        Backendless.Data.of(Courses.class).find(new AsyncCallback<List<Courses>>() {
            @Override
            public void handleResponse(List<Courses> response) {
                // Turning all data from the table to a string (done for each line of data)
                String cName, semester, finalStr;
                int courseId;
                cList.add("Course;ID;Semester");
                for (Courses course : response) {
                    if(course.getClassID() == cId) {
                        cName = course.getCourseName();
                        courseId = course.getCourseID();
                        semester = course.getSemester();
                        finalStr = cName + ";" + courseId + ";" + semester;
                        cList.add(finalStr);
                    }
                }
                String s = cList.isEmpty() ? "You have No Courses" : "Here are your courses:";

                titles.setText(s);
                titles.setVisibility(View.VISIBLE);

                updateListView();
            }

            @Override
            public void handleFault(BackendlessFault fault) {
                Log.e("Error", "handleFault: " + fault.getMessage());
            }
        });
    }

    private void updateListView() {
        CourseAdapter courseAdapter = new CourseAdapter(context, cList);
        coursesList = findViewById(R.id.courseList);
        coursesList.setAdapter(courseAdapter);
    }
}

// ---------------- Defaults.java ------------------------

package com.sgl.mybackendless;

class Defaults {

    static final String APPLICATION_ID = "E0699EFD-6032-8AE7-FF1C-260DE5868F00";
    static final String API_KEY = "D5022513-3665-43A7-9E2B-1D9AD2FAF31A";

    static final String[] CLASSES = {"Applications", "Mathematics", "ComputerGraphics"};
    static final String[] COURSES = {"Java", "Android", "Swift", "Linear Algebra", "Combinatorics", "Statistics", "Projection", "Camera", "Shadowing"};
    static final String[] DEANS = {"Zeev Mindali", "Daniel Braudo", "Eran Segal"};
}

//------------------- CourseAdapter.java ------------------------

package com.sgl.mybackendless;

import android.content.Context;
import android.graphics.Color;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.HashMap;
import java.util.List;

public class CourseAdapter extends BaseAdapter {

    private List courses;
    private Context context;
    TextView courseId;
    TextView courseName;
    TextView semester;

    public CourseAdapter(Context context, List coursesList) {
        this.context = context;
        this.courses = coursesList;
    }

    @Override
    public int getCount() {
        return courses.size();
    }

    @Override
    public Object getItem(int position) {
        return (getCount() > 0) ? courses.get(position) : null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        final View singleView = LayoutInflater.from(context).inflate(R.layout.course_layout, null);
        courseId = singleView.findViewById(R.id.courseID);
        courseName = singleView.findViewById(R.id.courseName);
        semester = singleView.findViewById(R.id.semester);
        String[] values = ((String)courses.get(position)).split(";");
        if(values.length != 3) {
            Log.e("Error", "getView: " + " failed to parse course details!" );
        } else {
            courseId.setText(values[0]);
            courseName.setText(values[1]);
            semester.setText(values[2]);
        }
        if(position == 0) {
            courseName.setTextColor(Color.YELLOW);
            courseId.setTextColor(Color.YELLOW);
            semester.setTextColor(Color.YELLOW);
            courseName.setBackgroundColor(0xFFFF0000);
            courseId.setBackgroundColor(0xFFFF0000);
            semester.setBackgroundColor(0xFFFF0000);
        }
        return singleView;
    }
}


// ----------------------- Class.java (generated from Backendless) ----------------------------


package com.sgl.mybackendless;

import com.backendless.Backendless;
import com.backendless.BackendlessUser;
import com.backendless.async.callback.AsyncCallback;
import com.backendless.persistence.*;
import com.backendless.geo.GeoPoint;

import java.util.List;
import java.util.Date;

public class Class
{
  private String objectId;
  private Date created;
  private Date updated;
  private Integer classID;
  private String ClassDean;
  private String ownerId;
  private String ClassName;
  public String getObjectId()
  {
    return objectId;
  }

  public Date getCreated()
  {
    return created;
  }

  public Date getUpdated()
  {
    return updated;
  }

  public Integer getClassID()
  {
    return classID;
  }

  public void setClassID( Integer classID )
  {
    this.classID = classID;
  }

  public String getClassDean()
  {
    return ClassDean;
  }

  public void setClassDean( String ClassDean )
  {
    this.ClassDean = ClassDean;
  }

  public String getOwnerId()
  {
    return ownerId;
  }

  public String getClassName()
  {
    return ClassName;
  }

  public void setClassName( String ClassName )
  {
    this.ClassName = ClassName;
  }


  public Class save()
  {
    return Backendless.Data.of( Class.class ).save( this );
  }

  public void saveAsync( AsyncCallback<Class> callback )
  {
    Backendless.Data.of( Class.class ).save( this, callback );
  }

  public Long remove()
  {
    return Backendless.Data.of( Class.class ).remove( this );
  }

  public void removeAsync( AsyncCallback<Long> callback )
  {
    Backendless.Data.of( Class.class ).remove( this, callback );
  }

  public static Class findById( String id )
  {
    return Backendless.Data.of( Class.class ).findById( id );
  }

  public static void findByIdAsync( String id, AsyncCallback<Class> callback )
  {
    Backendless.Data.of( Class.class ).findById( id, callback );
  }

  public static Class findFirst()
  {
    return Backendless.Data.of( Class.class ).findFirst();
  }

  public static void findFirstAsync( AsyncCallback<Class> callback )
  {
    Backendless.Data.of( Class.class ).findFirst( callback );
  }

  public static Class findLast()
  {
    return Backendless.Data.of( Class.class ).findLast();
  }

  public static void findLastAsync( AsyncCallback<Class> callback )
  {
    Backendless.Data.of( Class.class ).findLast( callback );
  }

  public static List<Class> find( DataQueryBuilder queryBuilder )
  {
    return Backendless.Data.of( Class.class ).find( queryBuilder );
  }

  public static void findAsync( DataQueryBuilder queryBuilder, AsyncCallback<List<Class>> callback )
  {
    Backendless.Data.of( Class.class ).find( queryBuilder, callback );
  }
}

//--------------- Courses.java (generated from Backendless) -------------


package com.sgl.mybackendless;

import com.backendless.Backendless;
import com.backendless.BackendlessUser;
import com.backendless.async.callback.AsyncCallback;
import com.backendless.persistence.*;
import com.backendless.geo.GeoPoint;

import java.util.List;
import java.util.Date;

public class Courses
{
  private String courseName;
  private String semester;
  private Date created;
  private Integer classID;
  private String ownerId;
  private Date updated;
  private Integer courseID;
  private String objectId;
  public String getCourseName()
  {
    return courseName;
  }

  public void setCourseName( String courseName )
  {
    this.courseName = courseName;
  }

  public String getSemester()
  {
    return semester;
  }

  public void setSemester( String semester )
  {
    this.semester = semester;
  }

  public Date getCreated()
  {
    return created;
  }

  public Integer getClassID()
  {
    return classID;
  }

  public void setClassID( Integer classID )
  {
    this.classID = classID;
  }

  public String getOwnerId()
  {
    return ownerId;
  }

  public Date getUpdated()
  {
    return updated;
  }

  public Integer getCourseID()
  {
    return courseID;
  }

  public void setCourseID( Integer courseID )
  {
    this.courseID = courseID;
  }

  public String getObjectId()
  {
    return objectId;
  }


  public Courses save()
  {
    return Backendless.Data.of( Courses.class ).save( this );
  }

  public void saveAsync( AsyncCallback<Courses> callback )
  {
    Backendless.Data.of( Courses.class ).save( this, callback );
  }

  public Long remove()
  {
    return Backendless.Data.of( Courses.class ).remove( this );
  }

  public void removeAsync( AsyncCallback<Long> callback )
  {
    Backendless.Data.of( Courses.class ).remove( this, callback );
  }

  public static Courses findById( String id )
  {
    return Backendless.Data.of( Courses.class ).findById( id );
  }

  public static void findByIdAsync( String id, AsyncCallback<Courses> callback )
  {
    Backendless.Data.of( Courses.class ).findById( id, callback );
  }

  public static Courses findFirst()
  {
    return Backendless.Data.of( Courses.class ).findFirst();
  }

  public static void findFirstAsync( AsyncCallback<Courses> callback )
  {
    Backendless.Data.of( Courses.class ).findFirst( callback );
  }

  public static Courses findLast()
  {
    return Backendless.Data.of( Courses.class ).findLast();
  }

  public static void findLastAsync( AsyncCallback<Courses> callback )
  {
    Backendless.Data.of( Courses.class ).findLast( callback );
  }

  public static List<Courses> find( DataQueryBuilder queryBuilder )
  {
    return Backendless.Data.of( Courses.class ).find( queryBuilder );
  }

  public static void findAsync( DataQueryBuilder queryBuilder, AsyncCallback<List<Courses>> callback )
  {
    Backendless.Data.of( Courses.class ).find( queryBuilder, callback );
  }
}

//////////////////// Layout files ------------------------------
//----------------- activity_main.xml -------------------------

<?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=".MainActivity">

    <ScrollView
        android:id="@+id/scrollView2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#DD3131"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingStart="18dp"
            android:paddingTop="24dp"
            android:paddingEnd="24dp">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:gravity="center"
                android:text="@string/mindali_university_of_apps"
                android:textColor="#FFFFFF"
                android:textSize="44sp" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">

                <ImageView
                    android:id="@+id/pic1"
                    android:layout_width="0dp"
                    android:layout_height="120dp"
                    android:layout_gravity="center"
                    android:layout_marginTop="24dp"
                    android:layout_marginBottom="24dp"
                    android:layout_weight="1"
                    android:alpha="0.6"
                    android:contentDescription="@string/site_logo"
                    android:src="@drawable/diploma"
                    android:tint="#FEFFFFFF" />
            </LinearLayout>



            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="20dp"
                android:gravity="center"
                android:text="@string/welcome"
                android:textColor="#FFFFFF"
                android:textSize="24sp" />
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="12dp"
                android:layout_marginBottom="12dp"
                android:gravity="center"
                android:text="@string/join"
                android:textColor="#FFFFFF"
                android:textSize="20sp" />
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal">

                <Button
                    android:id="@+id/btn_login"
                    style="@style/Widget.AppCompat.Button.Borderless.Colored"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="24dp"
                    android:layout_marginEnd="12dp"
                    android:layout_marginBottom="24dp"
                    android:layout_weight="1"
                    android:background="#5E910707"
                    android:padding="12dp"
                    android:text="@string/login"
                    android:textColor="#FFFFFF"
                    android:textSize="18sp" />

                <Button
                    android:id="@+id/btn_register"
                    style="@style/Widget.AppCompat.Button.Borderless.Colored"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginStart="12dp"
                    android:layout_marginTop="24dp"
                    android:layout_marginBottom="24dp"
                    android:layout_weight="1"
                    android:background="#5E910707"
                    android:padding="12dp"
                    android:text="@string/register"
                    android:textColor="#FFFFFF"
                    android:textSize="18sp" />
            </LinearLayout>
        </LinearLayout>
    </ScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>

//------------------------ activity_login.xml ----------------------------

<?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=".MainActivity">

    <ScrollView
        android:id="@+id/scrollView2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#DD3131"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingStart="24dp"
            android:paddingTop="56dp"
            android:paddingEnd="24dp">

            <ImageView
                android:id="@+id/logo"
                android:layout_width="wrap_content"
                android:layout_height="96dp"
                android:layout_gravity="center"
                android:layout_marginBottom="24dp"
                android:layout_marginTop="24dp"
                android:alpha="0.6"
                android:contentDescription="@string/site_logo"
                android:src="@drawable/logo" />

            <!-- Email Label -->
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="24dp"
                android:gravity="left"
                android:text="Email"
                android:textColor="#FFFFFF"
                android:textSize="16sp" />

            <EditText
                android:id="@+id/input_email"
                style="@style/Base.Widget.MaterialComponents.TextInputEditText"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="textEmailAddress"
                android:textAppearance="@style/TextAppearance.AppCompat.Medium"
                android:textColor="#FFFFFF" />


            <!-- Password Label -->
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="24dp"
                android:gravity="left"
                android:text="Password"
                android:textColor="#FFFFFF"
                android:textSize="16sp" />
            <EditText
                android:id="@+id/input_password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textColor="#FFFFFF"
                android:inputType="textPassword" />

            <Button
                android:id="@+id/btn_login"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="24dp"
                android:layout_marginBottom="24dp"
                android:background="#5E910707"
                android:padding="12dp"
                android:text="@string/login"
                android:textColor="#FFFFFF"
                android:textSize="18sp" />


            <TextView
                android:id="@+id/txtToRegisterPage"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="24dp"
                android:gravity="center"
                android:text="@string/no_account_yet_create_one"
                android:textColor="#FFFFFF"
                android:textSize="16sp" />
        </LinearLayout>
    </ScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>

//--------------------- activity_register.xml ----------------------------

<?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=".MainActivity">

    <ScrollView
        android:id="@+id/scrollView2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#DD3131"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingStart="24dp"
            android:paddingTop="56dp"
            android:paddingEnd="24dp">

            <ImageView
                android:id="@+id/logo"
                android:layout_width="wrap_content"
                android:layout_height="96dp"
                android:layout_gravity="center"
                android:layout_marginTop="12dp"
                android:layout_marginBottom="12dp"
                android:alpha="0.6"
                android:contentDescription="@string/site_logo"
                android:src="@drawable/pic1" />

            <!-- First Name Label -->
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="6dp"
                android:gravity="start"
                android:text="@string/first_name"
                android:textColor="#FFFFFF"
                android:textSize="16sp" />

            <!-- First Name Input -->
            <EditText
                android:id="@+id/input_first_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:autofillHints="@string/email"
                android:contentDescription="@string/email"
                android:inputType="textEmailAddress"
                android:labelFor="@id/input_last_name"
                android:textColor="#FFFFFF" />

            <!-- Last Name Label -->
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="6dp"
                android:gravity="start"
                android:text="@string/last_name"
                android:textColor="#FFFFFF"
                android:textSize="16sp" />

            <!-- Last Name Input -->
            <EditText
                android:id="@+id/input_last_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:autofillHints="@string/email"
                android:contentDescription="@string/email"
                android:ems="10"
                android:inputType="textEmailAddress"
                android:labelFor="@id/input_first_name"
                android:textColor="#FFFFFF" />

            <!-- Email Label -->
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="6dp"
                android:gravity="start"
                android:text="@string/email"
                android:textColor="#FFFFFF"
                android:textSize="16sp" />

            <!-- Email Input -->
            <EditText
                android:id="@+id/input_email"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:autofillHints="@string/email"
                android:contentDescription="@string/email"
                android:ems="10"
                android:inputType="textEmailAddress"
                android:labelFor="@id/input_class"
                android:textColor="#FFFFFF" />

            <!-- Password Label -->
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="6dp"
                android:gravity="start"
                android:text="@string/password"
                android:textColor="#FFFFFF"
                android:textSize="16sp" />

            <!-- Password Input -->
            <EditText
                android:id="@+id/input_password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:autofillHints="@string/password"
                android:textColor="#FFFFFF"
                android:inputType="textPassword"
                android:labelFor="@id/input_email" />

            <!-- Class Label -->
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="6dp"
                android:gravity="start"
                android:text="@string/course"
                android:textColor="#FFFFFF"
                android:textSize="16sp" />

            <!-- Class Input -->
            <EditText
                android:id="@+id/input_class"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:autofillHints="@string/course"
                android:inputType="text"
                android:textColor="#FFFFFF"
                android:labelFor="@id/input_password" />

            <Button
                android:id="@+id/btn_register"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="12dp"
                android:layout_marginBottom="12dp"
                android:background="#5E910707"
                android:padding="12dp"
                android:text="@string/register"
                android:textColor="#FFFFFF"
                android:textSize="18sp" />


            <TextView
                android:id="@+id/txtToLogin"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="24dp"
                android:gravity="center"
                android:text="@string/already_registered"
                android:textColor="#FFFFFF"
                android:textSize="16sp" />
        </LinearLayout>
    </ScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>

//----------------------- activity_student.xml -------------------

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#DD3131"
            android:orientation="vertical"
            android:paddingStart="18dp"
            android:paddingTop="24dp"
            android:paddingEnd="24dp">

            <TextView
                android:id="@+id/txtWelcome"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:gravity="center"
                android:text="@string/student_welcome"
                android:textColor="#FFFFFF"
                android:textSize="32sp" />
            <TextView
                android:id="@+id/txtTable"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:gravity="start"
                android:text="@string/student_courses"
                android:textColor="#FFFFFF"
                android:textSize="24sp" />

            <ListView
                android:id="@+id/courseList"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginStart="20dp"
                android:layout_marginEnd="20dp"
                android:layout_marginTop="40dp"
                android:layout_marginBottom="60dp"/>

        </LinearLayout>


</androidx.constraintlayout.widget.ConstraintLayout>

//--------------------------------- course_layout.xml --------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="15dp">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/course"
        android:layout_margin="10dp"
        android:id="@+id/imgDevice"
        android:contentDescription="@string/course_pic" />

    <TextView
        android:id="@+id/courseName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginStart="30dp"
        android:layout_weight="1"
        android:text="@string/mock_data"
        android:textColor="#fff"
        android:textSize="18sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/courseID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginStart="30dp"
        android:layout_weight="1"
        android:text="@string/course_id"
        android:textColor="#fff"
        android:textSize="18sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/semester"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0.3"
        android:textStyle="bold"
        android:textColor="#fff"
        android:layout_gravity="center_vertical"
        android:textSize="18sp"
        android:paddingStart="20dp"
        android:paddingEnd="0dp"
        android:layout_marginStart="20dp"
        android:text="@string/semester"/>
</LinearLayout>