How to Build a Notes App in Android Studio

In this tutorial, you will learn how to build a simple Notes App in Android Studio. This app allows users to create, update, delete, and view notes using a local database.

Features of Notes App

Add new notes
Edit existing notes
Delete notes
View all notes
Store data locally using SQLite or Room

Tools Required

Android Studio
Java or Kotlin
SQLite or Room Database
Basic UI Design (XML)

Project Setup

Create a new project in Android Studio and choose Empty Activity. Select your preferred language (Java/Kotlin).

Design Layout (XML)

              
            
XML

            
            <EditText
    android:id="@+id/editTextNote"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="Enter note" />

<Button
    android:id="@+id/btnSave"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Save" />
          

Create Database Helper (SQLite - Java)

              
            
Java

            
            public class DBHelper extends SQLiteOpenHelper {
    public DBHelper(Context context) {
        super(context, "NotesDB", null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("CREATE TABLE notes(id INTEGER PRIMARY KEY AUTOINCREMENT, content TEXT)");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS notes");
        onCreate(db);
    }
}
          

Insert Note

              
Java

            public void insertNote(String note) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put("content", note);
    db.insert("notes", null, values);
}

Display Notes

              
Java

            public Cursor getNotes() {
    SQLiteDatabase db = this.getReadableDatabase();
    return db.rawQuery("SELECT * FROM notes", null);
}

Update Note

              
Java

            public void updateNote(int id, String note) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put("content", note);
    db.update("notes", values, "id=?", new String[]{String.valueOf(id)});
}

Delete Note

              
Java

            public void deleteNote(int id) {
    SQLiteDatabase db = this.getWritableDatabase();
    db.delete("notes", "id=?", new String[]{String.valueOf(id)});
}

Main Activity Logic

              
Java

            btnSave.setOnClickListener(v -> {
    String note = editTextNote.getText().toString();
    dbHelper.insertNote(note);
    Toast.makeText(this, "Saved", Toast.LENGTH_SHORT).show();
});

Enhancements

Use RecyclerView to display notes
Add search functionality
Use Room Database for better architecture
Add dark mode support
Sync with cloud (Firebase)

Common Mistakes

Not closing database connections
Missing permissions
Improper UI handling
Not validating input
Ignoring lifecycle methods

Practice Exercises

Add title and description fields
Implement RecyclerView list
Add edit screen
Add search bar
Convert SQLite to Room

Conclusion

Building a Notes App helps you understand CRUD operations, local databases, and Android UI development. It is a great beginner project to strengthen your Android development skills.

Note: Note: Always test database operations to ensure data is saved and retrieved correctly.