我的应用程序从服务器获取数据并将其显示在列表视图中。我正在对数据进行排序并希望显示它们，所以我想使用单选按钮来更改视图。对于每个按钮，都应将另一个内容加载到适配器显示的列表中。问题是没有视图出现，不幸的是我的屏幕保持空白。如何正确加载它们并更改 onClick 输入？（在这种情况下，我想用单选按钮显示 contactList 和 contactListTwo）

到目前为止，这是我的代码。我所说的部分在底部：

public class CallsFragment extends Fragment{

private String TAG = MainActivity.class.getSimpleName();
private ListView lv;
private static String url = "xx";
int a = 1;
String title;
private BaseAdapter mContactsAdapter;
private RadioGroup rg;
RadioButton rb1;
RadioButton rb2;
RadioButton rb3;
private final List<HashMap<String, String>> mContactsListItems = new ArrayList<>();

ArrayList<HashMap<String, String>> contactList;
ArrayList<HashMap<String, String>> contactListTwo;

private static final int rb1id = 2;
private static final int rb2id = 1;
private static final int rb3id = 0;

public CallsFragment() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view =  inflater.inflate(R.layout.fragment_calls, container, false);

    contactList = new ArrayList<>();
    contactListTwo = new ArrayList<>();

    rg = (RadioGroup) view.findViewById(R.id.RGroup);
    rb1 = (RadioButton) view.findViewById(R.id.radioButton5);
    rb2 = (RadioButton) view.findViewById(R.id.radioButton4);
    rb3 = (RadioButton) view.findViewById(R.id.radioButton6);

    rb1.setId(rb1id);
    rb2.setId(rb2id);
    rb3.setId(rb3id);

    ((ListView) view.findViewById(R.id.list))
            .setAdapter(mContactsAdapter);

    return view;
}


private class GetContacts extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPreExecute () {
        super.onPreExecute();
    }

    @Override
    protected Void doInBackground (Void...arg0){
        HttpHandler sh = new HttpHandler();

        //request to url and getting response
        String jsonStr = sh.makeServiceCall("https://creativecommons.tankerkoenig.de/json/list.php?lat=" + lat + "&lng=" + lon + "&rad=" + umkreis + "&sort=price&type="+ type +"&apikey=21f2ed18-88b1-5d26-34f3-28318713eaf4");

        Log.e(TAG, "Response from url: " + jsonStr);

        if (jsonStr != null) {
            try {
                JSONObject jsonObj = new JSONObject(jsonStr);

                // Getting JSON Array node
                JSONArray contacts = jsonObj.getJSONArray("stations");

                // looping through All Contacts
                for (int i = 0; i < contacts.length(); i++) {

                    JSONObject c = contacts.getJSONObject(i);

                    String id = c.getString("id");
                    String price = c.getString("price");

                    //tmp hash map for single contact
                    HashMap<String, String> contact = new HashMap<>();

                    // adding each child node to HashMap key => value
                    contact.put("id",id);
                    contact.put("price", price);

                    //adding contact to contact list
                    contactList.add(contact);
                    }

                }

            } catch (final JSONException e) {
                Log.e(TAG, "Json parsing error: " + e.getMessage());
                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                    }
                });
            }
        } else {
            Log.e(TAG, "Couldn't get json from server.");
            getActivity().runOnUiThread(new Runnable() {
                @Override
                public void run() {

                }
            });
        }

        return null;
    }

    @Override
    protected void onPostExecute (Void result){
        super.onPostExecute(result);     
        /**
         * Updating parsed JSON data into ListView
         * */
        mContactsAdapter = new SimpleAdapter(
                getActivity(), mContactListItems,
                R.layout.list_item, new String[]{"price", "brand",
                "dist", "street", "houseNumber", "postcode", "place"}, new int[]{R.id.stoff,
                R.id.brand, R.id.dist, R.id.street, R.id.houseNumber, R.id.postCode, R.id.place});

mContactListItems.addAll(contactListTwo);
mContactsAdapter.notifyDataSetChanged();

        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                mContactsListItems.clear();

                switch (checkedId) {
                    case R.id.radioButton4:
                        mContactsListItems.addAll(contactList);
                        break;
                    case R.id.radioButton5:
                        mContactsListItems.addAll(contactListTwo);
                        break;                       
                }
                //mark as changed, update list
                mContactsAdapter.notifyDataSetChanged();

            }
        });

 }
}