### Instruction:
Develop an Android app using Kotlin that allows users to create, edit, and delete notes. Notes should be stored locally on the device using SQLite database. The app should also include search functionality to find notes based on keywords.
PLAINFORMAT

### Response:

```kotlin
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.RecyclerView
import androidx.room.Room
import com.google.android.material.floatingactionbutton.FloatingActionButton

// MainActivity class for the NotesApp
class MainActivity : AppCompatActivity() {

    private lateinit var db: AppDatabase // Database instance
    private lateinit var notesList: RecyclerView // RecyclerView to display notes list
    private lateinit var addButton: FloatingActionButton // Button to add a new note

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Initialize database
        db = Room.databaseBuilder(
            applicationContext,
            AppDatabase::class.java, "notes_database"
        ).build()

        // Find views by ID
        notesList = findViewById(R.id.notes_list)
        addButton = findViewById(R.id.add_button)

        // Set up RecyclerView and adapter for notes list
        val notesAdapter = NotesAdapter(this, db.noteDao())
        notesList.adapter = notesAdapter

        // Add click listener for adding a new note
        addButton.setOnClickListener {
            showCreateEditNoteDialog(null) { title, content ->
                val note = Note(id = 0, title = title, content = content)
                notesAdapter.insert(note)
            }
        }

        // Load initial data from the database
        notesAdapter.loadNotes()
    }

    // Function to show dialog for creating or editing a note
    private fun showCreateEditNoteDialog(note: Note?, onSave: (String, String) -> Unit) {
        // TODO: Implement dialog UI and logic
    }
}
```

```xml
<!-- activity_main.xml -->
<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">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/notes_list"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toTopOf="@+id/add_button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/add_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@drawable/ic_add" />
</androidx.constraintlayout.widget.ConstraintLayout>
```

```xml
<!-- item_note.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        android:id="@+id/note_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        tools:text="Note Title" />

    <TextView
        android:id="@+id/note_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:textSize="14sp"
        tools:text="Note Content" />
</LinearLayout>
```

```xml
<!-- dialog_create_edit_note.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="16dp">

    <EditText
        android:id="@+id/note_title_input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Title" />

    <EditText
        android:id="@+id/note_content_input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:hint="Content" />
</LinearLayout>
```