Fragment überlagerung einer Aktivität layout

Ich Probleme mit dem arbeiten mit Fragmenten. Das problem ist: ich habe ein layout in meine Tätigkeit mit ein ListView. Wenn ich wählen Sie einen Eintrag in dieser ListView-Steuerelement instanziiert ein fragment einbauen der activity-layout. Mein Ergebnis ist sowohl fragments und der Aktivität Inhalt zeigen sich auf Bildschirm, überlagern sich gegenseitig. Was kann ich den Fehler beheben (fragment, nur anstelle der Aktivitäten, Inhalte)? Hier die codes:

activityLayout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" 
android:layout_height="match_parent"
android:id="@+id/activity" 
android:orientation="vertical">

   <FrameLayout android:id="@+id/fragment_to_replace"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:visibility="visible"
        android:orientation="vertical"
        android:layout_gravity="center" >

       <TextView android:id="@+id/textView"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:visibility="visible"
            android:text="@string/textView_select_table"
            android:textSize="30dp"/>

       <ListView android:layout_marginTop="20dp"
         android:layout_width="fill_parent"
         android:layout_height="200dp"
         android:id="@+id/listView"
         android:visibility="visible" 
         android:paddingTop="40dp" />

   </FrameLayout>

</LinearLayout>

Activity.java

 public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity);

    View view = findViewById(R.id.activity);    

    //Getting the ListView
    ListView listView = (ListView) view.findViewById(R.id.listView);
    listView.setTextFilterEnabled(true);

    //Setting the adapter
    listView.setAdapter(new Adapter(this));

    listView.setOnItemClickListener(new OnItemClickListener() {

            @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {

              //Creates a fragment 
              addFragment();
        }

    });

}

 public void addFragment(){

     MyFragment newFragment;

     FragmentTransaction newFragmentTransaction = getSupportFragmentManager().beginTransaction();

     newFragment = (MyFragment) getSupportFragmentManager()
            .findFragmentById(R.id.fragment);

      if (newFragment == null){
               newFragment = new MyFragment(this, getSupportFragmentManager());
           newFragmentTransaction.replace(R.id.fragment_to_replace, 
                new SelectDrinkFragment(this,   getSupportFragmentManager()));
           newFragmentTransaction.addToBackStack(null);
           newFragmentTransaction.commit();

      }
 }

fragmentLayout.xml

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/fragment"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical" >

   <TextView  
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:visibility="visible"
     android:text="@string/textView_two"
     android:textSize="20dp"/>

     <LinearLayout android:layout_marginTop="10dp"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="horizontal">

        <TextView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:visibility="visible"
        android:text="@string/textView" />

        <TextView android:id="@+id/textView_two"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:visibility="visible"/>

    </LinearLayout>

    <TextView 
      android:id="@+id/textView_three"
      android:layout_marginTop="10dp"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:visibility="visible"
      android:text="@string/textView_three"/>

     <ListView 
   android:layout_width="fill_parent"
   android:layout_height="0dp"
   android:layout_weight="1" 
   android:id="@+id/listView_two"
   android:visibility="visible" 
   android:paddingTop="40dp" />

 </LinearLayout>

Fragment.java

 public View onCreateView(final LayoutInflater inflater, final ViewGroup container,      Bundle saveInstanceState){


    View view = inflater.inflate(R.layout.fragment, container, false);  

    final ListView listView = (ListView) view.findViewById(R.id.listView_two); 

    CharSequence [] list = getResources().getStringArray(R.array.array);

    listView.setAdapter(new ListAdapter(getContext(), list));

    return view;

 }

ListAdapter.java

 public class ListAdapter extends BaseAdapter{

      private Context context;
      private CharSequence[] drinkArraySize;

      public ListAdapter(Context context, CharSequence[] array){
          super();
          this.context = context;
          this.array= array;
      }

      @Override
      public int getCount() {
        return array.length;
      }

      @Override
      public Object getItem(int position) {
        return null;
      }

     @Override
     public long getItemId(int position) {
       return 0;
     }

     public Context getContext(){
          return context;
     }

     @Override
     public View getView(int position, View convertView, ViewGroup parent) {

        LinearLayout linearLayout = new LinearLayout(getContext());

        RadioButton radioButton = new RadioButton(getContext());
        radioButton.setText(array[position]);

        linearLayout.addView(radioButton);

        return linearLayout;
     }

}