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Question

我是android studio的新手，而且我不知道如何解决此问题。我正在尝试根据我的数据创建在线列表视图。我使用okhttp在服务器和应用程序之间建立了连接，但是当我向服务器发送请求时，出现此错误：

类型java.lang.String的值br不能转换为JSONObject

这是我使用okhttp与服务器的连接：

public class JSONParser {


private static final String KEY_USER_ID = "user_id";
/**
 * Response
 */
private static Response response;
/**
 * Get Data From WEB
 *
 * @return JSON Object
 */
public static JSONObject getDataFromWeb() {
    try {
        OkHttpClient client = new OkHttpClient();

        MediaType mediaType = MediaType.parse("application/json");
        RequestBody body = RequestBody.create(mediaType, "{\"action\":\"appointmentlist\",\"tokenid\":\"j93F03JjfW0kdS\",\"user\":\"apptester\",\"pass\":\"123456\"}");
        Request request = new Request.Builder()
                .url("***")
                .post(body)
                .addHeader("Content-Type", "application/json")
                .addHeader("cache-control", "no-cache")
                .addHeader("Postman-Token", "ffcce4c8-7904-4a1d-a2dd-88b94ae8185f")
                .build();
        response = client.newCall(request).execute();
        return new JSONObject(response.body().string());
    } catch (@NonNull IOException | JSONException e) {
        Log.e(TAG, "" + e.getLocalizedMessage());
    }
    return null;
}

这是我的主要活动

public class MainActivity extends AppCompatActivity {

private ListView listView;
private ArrayList<MyDataModel> list;
private MyArrayAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    /**
     * Array List for Binding Data from JSON to this List
     */
    list = new ArrayList<>();
    /**
     * Binding that List to Adapter
     */
    adapter = new MyArrayAdapter(this, list);

    /**
     * Getting List and Setting List Adapter
     */

    /**
     * Just to know onClick and Printing Hello Toast in Center.
     */
    Toast toast = Toast.makeText(getApplicationContext(), "Click on FloatingActionButton to Load JSON", Toast.LENGTH_LONG);
    toast.setGravity(Gravity.CENTER, 0, 0);
    toast.show();

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(@NonNull View view) {

            /**
             * Checking Internet Connection
             */
            if (InternetConnection.checkConnection(getApplicationContext())) {
                new GetDataTask().execute();
            } else {
                Snackbar.make(view, "Internet Connection Not Available", Snackbar.LENGTH_LONG).show();
            }
        }
    });
}

/**
 * Creating Get Data Task for Getting Data From Web
 */
class GetDataTask extends AsyncTask<Void, Void, Void> {

    ProgressDialog dialog;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        /**
         * Progress Dialog for User Interaction
         */
        dialog = new ProgressDialog(MainActivity.this);
        dialog.setTitle("Hey Wait Please...");
        dialog.setMessage("I am getting your JSON");
        dialog.show();
    }

    @Nullable
    @Override
    protected Void doInBackground(Void... params) {

        /**
         * Getting JSON Object from Web Using okHttp
         */
        JSONObject jsonObject = JSONParser.getDataFromWeb();

        try {
            /**
             * Check Whether Its NULL???
             */
            if (jsonObject != null) {
                /**
                 * Check Length...
                 */
                if(jsonObject.length() > 0) {
                    /**
                     * Getting Array named "contacts" From MAIN Json Object
                     */
                    JSONArray array = jsonObject.getJSONArray(Keys.KEY_DATA);

                    /**
                     * Check Length of Array...
                     */
                    int lenArray = array.length();
                    if(lenArray > 0) {
                        for(int jIndex = 0; jIndex < lenArray; jIndex++) {

                            /**
                             * Creating Every time New Object
                             * and
                             * Adding into List
                             */
                            MyDataModel model = new MyDataModel();

                            /**
                             * Getting Inner Object from contacts array...
                             * and
                             * From that We will get Name of that Contact
                             *
                             */
                            JSONObject innerObject = array.getJSONObject(jIndex);
                            String name = innerObject.getString(Keys.KEY_NAME);
                            String pack = innerObject.getString(Keys.KEY_PACK);
                            String unit = innerObject.getString(Keys.KEY_UNIT);
                            String brorgn = innerObject.getString(Keys.KEY_BR_OR_GN);
                            String price = innerObject.getString(Keys.KEY_PRICE);
                            String message = innerObject.getString(Keys.KEY_MSG);


                            String phone = phoneObject.getString(Keys.KEY_MOBILE);

                            model.setName(name);
                            model.setPack(pack);
                            model.setUnit(unit);
                            model.setBrorgn(brorgn);
                            model.setPrice(price);
                            model.setMessage(message);

                            /**
                             * Adding name and phone concatenation in List...
                             */
                            list.add(model);
                        }
                    }
                }
            } else {

            }
        } catch (JSONException je) {
            Log.i(JSONParser.TAG, "bia inm bekhon dige" + je.getLocalizedMessage());
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        dialog.dismiss();
        /**
         * Checking if List size if more than zero then
         * Update ListView
         */
        if(list.size() > 0) {
            adapter.notifyDataSetChanged();
        } else {
            Snackbar.make(findViewById(R.id.parentLayout), "No Data Found", Snackbar.LENGTH_LONG).show();
        }
    }
}

和我的日志：

2019-11-30 19:33:53.797 3127-5808/com.twilio.adv E/TAG: Value <br of type java.lang.String cannot be converted to JSONObject

Answer 1

您的Web服务器正在响应您的请求而返回HTML，而不是JSON。在调试器中检查response，或将response登录到Logcat，以查看确切的信息。