Question

我正在尝试从Web服务获取服务列表并将其添加到autocompletetextview。因此，假设您输入"a"，您将在autocompletetextview中获得以下服务列表。我认为它是一个json数组，但我收到错误"Json error: Value Body Spa at 0 of type java.lang.String cannot be converted to JSONArray".如果我这样做的话，请纠正我。

// you get this json response on entering "a"

[
  "Body Spa",
  "Hair Cut",
  "Hair massage",
  "fghfghfgh",
  "rtyrt",
  "Gold Facial",
  "Foot's massage"
]

public class HomeOptionTwo extends Fragment implements TextWatcher{

    AutoCompleteTextView autoservice;
    String[] list;
    ArrayAdapter<String> adapter;

    private static final String SERVICE = "http://192.168.200.1/android/spaservice";

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.homeoptiontwo, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        autoservice = (AutoCompleteTextView)view.findViewById(R.id.service);


        autoservice.addTextChangedListener(this);





    }

    private void prepareMyList() {

        StringRequest stringRequest = new StringRequest(Request.Method.POST, SERVICE,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {

                        try {
                            //JSONObject jObj = new JSONObject(response);

                            JSONArray jsonarray = new JSONArray(response);
                            for (int i = 0; i < jsonarray.length(); i++) {
                                Toast.makeText(getActivity(), "services:" + jsonarray.getJSONArray(i), Toast.LENGTH_SHORT).show();

                                adapter = new ArrayAdapter<String>(
                                        getActivity(),
                                        android.R.layout.simple_dropdown_item_1line,
                                        list);

                                autoservice.setAdapter(adapter);
                            }





                        } catch (JSONException e) {
                            // JSON error
                            e.printStackTrace();
                            Toast.makeText(getActivity(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getActivity(), "VolleyError" + error.toString(), Toast.LENGTH_LONG).show();
            }
        }) {
            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<String, String>();
                params.put("'phrase", autoservice.getText().toString());
                return params;
            }

        };

        RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
        requestQueue.add(stringRequest);
    }


    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        prepareMyList();

    }

    @Override
    public void afterTextChanged(Editable s) {

    }
}

Answer 1

下面：

 Toast.makeText(getActivity(), 
     "services:" + jsonarray.getJSONArray(i), Toast.LENGTH_SHORT).show();

jsonarray包含String作为项而不是JSONArray。使用optString或getString使用索引从jsonarray JSONArray获取值。像：

ArrayList<String> arrList=new ArrayList<String>();
for (int i = 0; i < jsonarray.length(); i++) {
   String strValue=jsonarray.optString(i);                             
   arrList.add(strValue);
 }
  adapter = new ArrayAdapter<String>(
                getActivity(),
                android.R.layout.simple_dropdown_item_1line,
                arrList);

  autoservice.setAdapter(adapter);

Answer 2

如果您想将数据添加到String [] arr = new String [100];那么它是错误的。您可以执行与ArrayList形式相同的工作，但请记住，您永远不会在这里放置Getter / Setter类。只需声明一下即可。看到这个例子。

在主分区中声明：

   ArrayList<String>arr=new ArrayList<>();

，然后以这种方式将其初始化：

for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject jsonObject1 = (JSONObject) jsonArray.get(i);
                String imei = jsonObject1.getString("imei");
                String name = jsonObject1.getString("name");
                String my_pic = jsonObject1.getString("my_pic");
                String email = jsonObject1.getString("email");

                arr.add(name);
            }


            adapter= new ArrayAdapter<>
                    (this, android.R.layout.select_dialog_item, arr);
            autoCompleteText.setThreshold(1);//will start working from first character
            autoCompleteText.setAdapter(adapter);//setting the adapter data into the AutoCompleteTextView
            autoCompleteText.setTextColor(Color.RED);


        }

我希望这对您有用...

将jsonarray列表设置为autocompletetextview

2 个答案: