Fragment dynamisch hinzufügen zu existierendem Fragmentlayout

1<?xml version="1.0" encoding="utf-8"?>
2<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:layout_width="fill_parent"
4 android:layout_height="fill_parent"
5 android:id="@+id/vg"
6 >
7 <fragment
8 android:id="@+id/listFragment"
9 android:layout_width="@dimen/width"
10 android:layout_height="wrap_content"
11 class="com.example.android.rssfeed.MyListFragment" >
12 </fragment>
13 <fragment
14 android:id="@+id/listFragment2"
15 android:layout_width="@dimen/width"
16 android:layout_height="wrap_content"
17 android:layout_toRightOf="@id/listFragment"
18 class="com.example.android.rssfeed.MyListFragment2" >
19 </fragment>
20 <fragment
21 android:id="@+id/detailFragment"
22 android:layout_width="match_parent"
23 android:layout_height="wrap_content"
24 android:layout_below="@id/listFragment"
25 class="com.example.android.rssfeed.DetailFragment" >
26 </fragment>
27</RelativeLayout>

1@Override
2 protected void onCreate(Bundle savedInstanceState) {
3 super.onCreate(savedInstanceState);
4 setContentView(R.layout.activity_rssfeed_hori);
5 }
6 //Methode, die zu einem Options-Menu gehört
7 @Override
8 public boolean onOptionsItemSelected(MenuItem item) {
9 FragmentManager fragmentManager = getFragmentManager();
10 FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
11 ExampleFragment fragment = new ExampleFragment();
12 fragmentTransaction.add(R.id.vg, fragment);
13 fragmentTransaction.commit();
14 return true;
15 }