使用ArrayAdapter在片段中填充微调器

Question

我使用ActionBarSherlock Library在我的应用程序中实现导航抽屉，然后我有一个名为MainActivity的主类，其中显示了导航抽屉，在其中我已经实例化了我的所有片段。我无法填充“novopedido”（NovoPedido.java）框架的微调器，因为getActivity（）方法正在返回我的主类（MainActivity）。

在MainActivity.java中：Fragment novopedido = new NovoPedido();

    private void selectItem(int position) {

    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    // Locate Position
    switch (position) {
    case 0:
        ft.replace(R.id.content_frame, home);
        break;
    case 1:
        ft.replace(R.id.content_frame, novopedido);
        break;
    case 8:
        ft.replace(R.id.content_frame, configs);
        break;   
    case 10:
        ft.replace(R.id.content_frame, capture);
        break;
    }
    ft.commit();
    mDrawerList.setItemChecked(position, true);

    // Get the title followed by the position
    setTitle(title[position]);
    // Close drawer
    mDrawerLayout.closeDrawer(mDrawerList);
}

在NovoPedido.java

btnBuscarProduto.setOnClickListener(new View.OnClickListener() {  
        public void onClick(View v) {
            new Thread(new Runnable() {
                public void run() {
                    Looper.prepare();
                    buscarProduto();                          
                }

              }).start();
        }
    });

void buscarProduto(){
    try{
        httpclient = new DefaultHttpClient();
        httppost = new HttpPost("http://192.168.1.101/android/busca.php");
        nameValuePairs = new ArrayList<NameValuePair>(2);
        nameValuePairs.add(new BasicNameValuePair("busca", edtBuscaProduto.getText().toString().trim())); 
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));            
        response=httpclient.execute(httppost);           
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        String response = httpclient.execute(httppost, responseHandler);

        if(response.equalsIgnoreCase("Vazio")){
            Toast toast = Toast.makeText(getActivity(), "Nada foi encontrado", Toast.LENGTH_SHORT);
            toast.show();             
        }
        else{
            List<String> list = new ArrayList<String>();
            String[] responseArray = response.split("\\|");
            System.out.println("Itens do response: "+response);
            for (int i =0; i<responseArray.length; i++){
                list.add(responseArray[i]);
                System.out.println("Item Adicionado: "+responseArray[i]);
            }
            System.out.println("responseArray.length: "+responseArray.length);
            System.out.println("responseArray: "+responseArray);
            ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_dropdown_item, list);
            ArrayAdapter<String> spinnerArrayAdapter = arrayAdapter;
            spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
            spnProdutos.setAdapter(spinnerArrayAdapter);
            System.out.println("Activity: "+getActivity());
        }
    } catch(NetworkOnMainThreadException e) {
    //  System.out.println("Erro de network: "+e.getMessage());
    }catch(Exception e){
        Toast toast = Toast.makeText(getActivity(), "Erro: "+e.getMessage(), Toast.LENGTH_SHORT);
        toast.show(); 
    }
}