Android : Convert ListActivity to FragmentActivity

I am a beginner in android mobile app development. I have a problem in converting a ListActivity to FragmantActivity. This is my code for ListActivity:

    public class MainActivity extends ListActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ArrayList<HighLightItem> items = HighLightItem.populateItems();       
        MyAdapter adapter = new MyAdapter(this, items);
        setListAdapter(adapter);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

and this is my HighLightItem class containing the arraylist:

public class HighLightItem {

    String itemName;
    int imageResourceRef;
    String shortDescription;

    public static ArrayList<HighLightItem> populateItems() {
        ArrayList<HighLightItem> items = new ArrayList<HighLightItem>();

        for (int x = 0; x < 10; x++) {

            HighLightItem item = new HighLightItem();

            switch (x) {
            case 0: {
                item.itemName = "Samsung Galaxy S5";
                item.imageResourceRef = R.drawable.galaxy_s;
                item.shortDescription = "Latest flagship device from Samsung.";
            }
                break;

            case 1: {
                item.itemName = "HTC One (M8)";
                item.imageResourceRef = R.drawable.htc_one_m8;
                item.shortDescription = "Latest flagship device from HTC.";
            }
                break;

            case 2: {
                item.itemName = "LG G3";
                item.imageResourceRef = R.drawable.lg_g3;
                item.shortDescription = "Latest flagship device from LG.";
            }
                break;

            case 3: {
                item.itemName = "LG G Watch";
                item.imageResourceRef = R.drawable.lg_wear;
                item.shortDescription = "Latest smartwatch from LG.";
            }
                break;

            case 4: {
                item.itemName = "Moto X";
                item.imageResourceRef = R.drawable.moto_x;
                item.shortDescription = "Latest smartphone from Motorola.";
            }
                break;

            case 5: {
                item.itemName = "Motorola 360";
                item.imageResourceRef = R.drawable.motorola_360;
                item.shortDescription = "Latest smartwatch from Motorola.";
            }
                break;

            case 6: {
                item.itemName = "Nexus 4 (Phone)";
                item.imageResourceRef = R.drawable.nexus_4;
                item.shortDescription = "Latest Nexus smartphone from LG and Google.";
            }
                break;

            case 7: {
                item.itemName = "Nexus 7 (Tablet)";
                item.imageResourceRef = R.drawable.nexus_7;
                item.shortDescription = "Latest Nexus tablet from Asus and Google.";
            }
                break;

            case 8: {
                item.itemName = "Nexus One";
                item.imageResourceRef = R.drawable.nexus_one;
                item.shortDescription = "One of the famous Nexus smartphone from HTC and Google.";
            }
                break;

            case 9: {
                item.itemName = "Xiaomi mi3";
                item.imageResourceRef = R.drawable.xiaomi_mi3;
                item.shortDescription = "Known for its Bang-for-the-buck trait!";
            }
                break;

            }

            items.add(item);
        }

        return items;
    }

}

I tried to copy the contents of my ListActivity to a new class which now extends FragmentActivity. But I've got an error in this part:

setListAdapter(adapter);

I tried to change it to FragmentList.setListAdapter(adapter) but it was still an error. What is wrong with my code? I want to make this ListActivity to FragmentActivity without creating another xml layout (just via code). Do I need to override onCreateView(String name, Context context, AttributeSet attrs) ? If yes, what will I implement inside the onCreateView?