Rozwiązanie krok po kroku: Aplikacja notatek konsolowa i mobilna (Java + Android)

public class Main {
    public static void main(String[] args) {
    }
}

import java.time.LocalDateTime;

public class Notatka {
    public String tytul;
    public String tresc;
    public boolean wazna;
    public LocalDateTime dataDodania;
}

import java.time.LocalDateTime;

public class Notatka {
    public String tytul;
    public String tresc;
    public boolean wazna;
    public LocalDateTime dataDodania;

    public Notatka(String tytul, String tresc, boolean wazna) {
        this.tytul = tytul;
        this.tresc = tresc;
        this.wazna = wazna;
        this.dataDodania = LocalDateTime.now();
    }

    public Notatka(String tytul) {
        this.tytul = tytul;
        this.tresc = "";
        this.wazna = false;
        this.dataDodania = LocalDateTime.now();
    }
}

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Notatka {
    public String tytul;
    public String tresc;
    public boolean wazna;
    public LocalDateTime dataDodania;

    public Notatka(String tytul, String tresc, boolean wazna) {
        this.tytul = tytul;
        this.tresc = tresc;
        this.wazna = wazna;
        this.dataDodania = LocalDateTime.now();
    }

    public Notatka(String tytul) {
        this.tytul = tytul;
        this.tresc = "";
        this.wazna = false;
        this.dataDodania = LocalDateTime.now();
    }

    public void wyswietl() {
        System.out.println("____________________");
        if (wazna) {
            System.out.println("Notatka WAŻNA! " + tytul);
        } else {
            System.out.println("Notatka " + tytul);
        }
        System.out.println(tresc);
        System.out.println(dataDodania.format(DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss")));
        System.out.println("____________________");
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Notatka waznaNotatka = new Notatka("tenis", "Gra z Ewą w poniedziałek", true);

        Scanner scanner = new Scanner(System.in);
        System.out.println("Podaj tytuł notatki:");
        String tytul = scanner.nextLine();
        Notatka zwyklaNotatka = new Notatka(tytul);

        waznaNotatka.wyswietl();
        zwyklaNotatka.wyswietl();
    }
}

package com.example.notatnik;

import android.os.Bundle;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });
    }
}

<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#F0F8FF"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Notatki"
        android:textColor="#0000CD"
        android:textSize="26sp" />

    <ListView
        android:id="@+id/notesList"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#F0F8FF"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Notatki"
        android:textColor="#0000CD"
        android:textSize="26sp" />

    <ListView
        android:id="@+id/notesList"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Dodanie notatki"
        android:textColor="#0000CD"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Tytuł notatki: " />

    <EditText
        android:id="@+id/titleInput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Treść notatki: " />

    <EditText
        android:id="@+id/contentInput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="DODAJ"
        android:textColor="#0000CD" />

</LinearLayout>

package com.example.notatnik;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Notatka {
    public String tytul;
    public String tresc;
    public boolean wazna;
    public LocalDateTime dataDodania;

    public Notatka(String tytul, String tresc, boolean wazna) {
        this.tytul = tytul;
        this.tresc = tresc;
        this.wazna = wazna;
        this.dataDodania = LocalDateTime.now();
    }

    public Notatka(String tytul) {
        this.tytul = tytul;
        this.tresc = "";
        this.wazna = false;
        this.dataDodania = LocalDateTime.now();
    }

    public void wyswietl() {
        System.out.println("____________________");
        if (wazna) {
            System.out.println("Notatka WAŻNA! " + tytul);
        } else {
            System.out.println("Notatka " + tytul);
        }
        System.out.println(tresc);
        System.out.println(dataDodania.format(DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss")));
        System.out.println("____________________");
    }

    @Override
    public String toString() {
        return tytul + "\n" + tresc;
    }
}

package com.example.notatnik;

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private final ArrayList<Notatka> notes = new ArrayList<>();
    private ArrayAdapter<Notatka> adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        notes.add(new Notatka("tenis", "Gra z Ewą w poniedziałek", true));
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, notes);
        ListView notesList = findViewById(R.id.notesList);
        notesList.setAdapter(adapter);
    }
}

package com.example.notatnik;

import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private final ArrayList<Notatka> notes = new ArrayList<>();
    private ArrayAdapter<Notatka> adapter;
    private EditText titleInput;
    private EditText contentInput;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        notes.add(new Notatka("tenis", "Gra z Ewą w poniedziałek", true));
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, notes);
        ListView notesList = findViewById(R.id.notesList);
        notesList.setAdapter(adapter);
        titleInput = findViewById(R.id.titleInput);
        contentInput = findViewById(R.id.contentInput);
    }

    public void addNote(View view) {
        notes.add(new Notatka(titleInput.getText().toString(), contentInput.getText().toString(), false));
        adapter.notifyDataSetChanged();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#F0F8FF"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Notatki"
        android:textColor="#0000CD"
        android:textSize="26sp" />

    <ListView
        android:id="@+id/notesList"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Dodanie notatki"
        android:textColor="#0000CD"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Tytuł notatki: " />

    <EditText
        android:id="@+id/titleInput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Treść notatki: " />

    <EditText
        android:id="@+id/contentInput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="addNote"
        android:text="DODAJ"
        android:textColor="#0000CD" />

</LinearLayout>

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Notatka {
    public String tytul;
    public String tresc;
    public boolean wazna;
    public LocalDateTime dataDodania;

    public Notatka(String tytul, String tresc, boolean wazna) {
        this.tytul = tytul;
        this.tresc = tresc;
        this.wazna = wazna;
        this.dataDodania = LocalDateTime.now();
    }

    public Notatka(String tytul) {
        this.tytul = tytul;
        this.tresc = "";
        this.wazna = false;
        this.dataDodania = LocalDateTime.now();
    }

    /*
      nazwa:        wyswietl
      opis:         wypisuje notatkę w osobnych liniach: linia podkreślników, tytuł (ze słowem WAŻNA!
                    dla ważnej notatki), treść, data dodania, linia podkreślników
      parametry:    brak
      zwracany typ: brak (void)
      autor:        Bartosz Bryniarski
    */
    public void wyswietl() {
        System.out.println("____________________");
        if (wazna) {
            System.out.println("Notatka WAŻNA! " + tytul);
        } else {
            System.out.println("Notatka " + tytul);
        }
        System.out.println(tresc);
        System.out.println(dataDodania.format(DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss")));
        System.out.println("____________________");
    }
}

System operacyjny: Windows 11
Środowiska programistyczne: IntelliJ IDEA (aplikacja konsolowa), Android Studio (aplikacja mobilna)
Emulator: Pixel 8 (Android 16, API 36) z Android Studio
Języki programowania: Java (aplikacja konsolowa i mobilna), XML (układ aplikacji mobilnej)

package com.example.notatnik;

import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private final ArrayList<Notatka> notes = new ArrayList<>();
    private ArrayAdapter<Notatka> adapter;
    private EditText titleInput;
    private EditText contentInput;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        notes.add(new Notatka("tenis", "Gra z Ewą w poniedziałek", true));
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, notes);
        ListView notesList = findViewById(R.id.notesList);
        notesList.setAdapter(adapter);
        titleInput = findViewById(R.id.titleInput);
        contentInput = findViewById(R.id.contentInput);
    }

    public void addNote(View view) {
        String title = titleInput.getText().toString().trim();
        if (title.isEmpty()) {
            titleInput.setError("Podaj tytuł notatki");
            return;
        }
        notes.add(new Notatka(title, contentInput.getText().toString().trim(), false));
        adapter.notifyDataSetChanged();
        titleInput.setText("");
        contentInput.setText("");
    }
}