Developing an app(ANDROID) I got from a tutorial. Having issues with setListArray & getListArray statements

This is a tutorial I got online. Everything works fine apart from those statements and I can't manage to resolve the problem. Here's the TestDatabase activity with the errors:

package com.lysandros.de.vogella.android.sqlite.first;

import java.util.List;
import java.util.Random;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;

public class TestDatabaseActivity extends ActionBarActivity {
    private CommentsDataSource datasource;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    datasource = new CommentsDataSource(this);
    datasource.open();

    List<Comment> values = datasource.getAllComments();

    //use the SimpleCursorAdapter to show the 
    //elements in a ListView
    ArrayAdapter<Comment> adapter = new ArrayAdapter<Comment>(this,
            android.R.layout.simple_list_item_1, values);
        setListAdapter(adapter);
}

//Will be called via the onCLick attribute
//of the buttons in main.xml
public void onClick(View view) {
    @SuppressWarnings("unchecked")
    ArrayAdapter<Comment> adapter = (ArrayAdapter<Comment>)
    getListAdapter();
    Comment comment = null;
    switch (view.getId()) {
    case R.id.add:
        String[] comments = new String [] { "Cool", "Very nice", "Hate it" };
        int nextInt = new Random().nextInt(3);
        //save the new comment
        comment = datasource.createComment(comments[nextInt]);

        adapter.add(comment);
        break;
    case R.id.delete:
        if (getListAdapter().getCount() > 0) {
            comment = (Comment) getListAdapter().getItem(0);
            datasource.deleteComment(comment);
            adapter.remove(comment);
        }
        break;
    }
    adapter.notifyDataSetChanged();
}

    @Override
      protected void onResume() {
        datasource.open();
        super.onResume();
      }

      @Override
      protected void onPause() {
        datasource.close();
        super.onPause();
      }
}

Here's my Comment activity:

package com.lysandros.de.vogella.android.sqlite.first;

    public class Comment {
    private long id;
    private String comment;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
         this.comment = comment;
    }

    //Will be used by the ArrayAdapter in the ListView
    @Override
    public String toString() {
        return comment;
    }

  }

Here's my CommentsDataSource activity:

package com.lysandros.de.vogella.android.sqlite.first;

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

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;

public class CommentsDataSource {

//Database fields
private SQLiteDatabase database;
private MySQLiteHelper dbHelper;
private String[] allColumns = { MySQLiteHelper.COLUMN_ID,
        MySQLiteHelper.COLUMN_COMMENT };

public CommentsDataSource(Context context) {
    dbHelper = new MySQLiteHelper(context);
}

public void open() throws SQLException {
    database = dbHelper.getWritableDatabase();
}

public void close() {
    dbHelper.close();
}

public Comment createComment(String comment) {
    ContentValues values = new ContentValues();
    values.put(MySQLiteHelper.COLUMN_COMMENT, comment);
    long insertId = database.insert(MySQLiteHelper.TABLE_COMMENTS, null, values);

    Cursor cursor = database.query(MySQLiteHelper.TABLE_COMMENTS,
            allColumns, MySQLiteHelper.COLUMN_ID + " = " + insertId,
            null, null, null, null);
    cursor.moveToFirst();
    Comment newComment = cursorToComment(cursor);
    cursor.close();
    return newComment;
}


public void deleteComment(Comment comment) {
    long id = comment.getId();
    System.out.println("Comment deleted with id: " + id);
    database.delete(MySQLiteHelper.TABLE_COMMENTS, MySQLiteHelper.COLUMN_ID
            + " = " + id, null);
}

public List<Comment> getAllComments() {
    List<Comment> comments = new ArrayList<Comment>();

    Cursor cursor = database.query(MySQLiteHelper.TABLE_COMMENTS,
            allColumns, null, null, null, null, null);

    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        Comment comment = cursorToComment(cursor);
        comments.add(comment);
        cursor.moveToNext();
    }

    //make sure to close the cursor
    cursor.close();
    return comments;
}

private Comment cursorToComment(Cursor cursor) {
    Comment comment = new Comment();
    comment.setId(cursor.getLong(0));
    comment.setComment(cursor.getString(1));
    return comment;

}

Here's my MySQLiteHelper activity:

package com.lysandros.de.vogella.android.sqlite.first;

import android.content.Context;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

public class MySQLiteHelper extends SQLiteOpenHelper {

public static final String TABLE_COMMENTS = "comments";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_COMMENT = "comment";

private static final String DATABASE_NAME = "comments.db";
private static final int DATABASE_VERSION = 1;

//Database creation sql statement
private static final String DATABASE_CREATE = "create table "
        + TABLE_COMMENTS + "(" + COLUMN_ID
        + "integer primary key autoincrement, " + COLUMN_COMMENT
        + "text not null);";

public MySQLiteHelper(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
  }

public void onCreate(SQLiteDatabase database) {
    database.execSQL(DATABASE_CREATE);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    Log.w(MySQLiteHelper.class.getName(),
            "Upgrading database from version " + oldVersion + " to "
            + newVersion + ", which will destroy all old data");
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_COMMENTS);
    onCreate(db);
}


}

Here's my main.xml file:

<LinearLayout xmlns:android="http://ift.tt/nIICcg"
xmlns:tools="http://ift.tt/LrGmb4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:orientation="vertical"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.lysandros.de.vogella.android.sqlite.first.TestDatabaseActivity" >

<LinearLayout
    android:id="@+id/group"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <Button
        android:id="@+id/add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/add_new"
        android:onClick="onClick"/>

    <Button 
        android:id="@+id/delete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/delete_first"
        android:onClick="onClick"/>
</LinearLayout>

<ListView
    android:id="@android:id/list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"/>
</LinearLayout>

Here's the link with the tutorial: http://ift.tt/1opMyPh

I'm new to this site, please let me know if I missed something out.