Question

在我的应用程序中，我有一个活动，负责通过以JSON格式从远程服务器获取数据来显示列表中的结果。但是当从服务器返回数据时，我的活动会冻结特定的响应。即status_code = -1，它存储在 jsonResult 变量中，但是当服务器返回其他状态代码时，它可以正常工作。

示例2来自服务器的响应消息

{"user_data":[],"status_message":"ERROR","status_code":-1}
{"user_data":[{"booked_slots":"1","slot_no":"2","place_name":"Centaurus","person_name":"faisal","slot_status":"Reserved","vehicle_no":"abc","startTime":"2","endTime":"3"}],"status_message":"OK","status_code":1}

每当返回status_code = -1时，活动会以圆形等待指针冻结，请等待，不再继续。

AsyncTask代码：

    private class AsyncDataClass extends AsyncTask<String, Void, String> {

        @Override

        protected String doInBackground(String... params) {

            String responseBody = "";

            HttpParams httpParameters = new BasicHttpParams();
            HttpConnectionParams.setConnectionTimeout(httpParameters, 5000);
            HttpConnectionParams.setSoTimeout(httpParameters, 5000);
            HttpClient httpClient = new DefaultHttpClient(httpParameters);
            HttpPost httpPost = new HttpPost(params[0]);
            String jsonResult = "";
            try {

                HttpResponse response = httpClient.execute(httpPost);
                jsonResult = inputStreamToString(response.getEntity().getContent()).toString();
                System.out.println("Returned Json object " + jsonResult.toString());
            } catch (ClientProtocolException e) {

                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return jsonResult;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(ShowSlots.this);
            pDialog.setMessage("Please wait...");
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override

        protected void onPostExecute(String result) {

            super.onPostExecute(result);
            System.out.println("Resulted Value: " + result);
            if(result.equals("") || result == null){
                Toast.makeText(ShowSlots.this, "Server connection failed", Toast.LENGTH_LONG).show();
                return;
            }
            int jsonResult = returnParsedJsonObject(result);
            if(jsonResult == -1){
                Toast.makeText(ShowSlots.this, "ALL Slots Are Available", Toast.LENGTH_LONG).show();
return;
            }
            if(jsonResult == 1){
                Toast.makeText(ShowSlots.this, "Got Parking Spots", Toast.LENGTH_LONG).show();
                try {
                    JSONObject jsonObj = new JSONObject(result);
                    // Getting JSON Array node
                    parkings = jsonObj.getJSONArray("user_data");
                    // looping through All Contacts
                    for (int i = 0; i < parkings.length(); i++) {
                        JSONObject c = parkings.getJSONObject(i);
                        String slot = c.getString(TAG_SLOT);
                        serverReturn.add(slot);
                    }

                    rts= new ArrayList<slots>();
                    String status="";
                    int counter = 1;
                       for(int i=0;i<availableParkings;i++){

                           for(int j = 0; j<serverReturn.size();j++){

                                if(counter==Integer.parseInt(serverReturn.get(j))){
                                    status="Reserved";
                                    break;
                                }
                               else{
                                    status="Available";
                                }

                           }
                           rts.add(new slots(parkingName, counter, status));
                           counter++;
                      }

                     refreshDisplay();

                } catch (JSONException e) {
                    e.printStackTrace();
                }


                if (pDialog.isShowing())
                    pDialog.dismiss();


            }

        }

        private StringBuilder inputStreamToString(InputStream is) {
            String rLine = "";
            StringBuilder answer = new StringBuilder();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            try {
                while ((rLine = br.readLine()) != null) {
                    answer.append(rLine);
                }
            } catch (IOException e) {
// TODO Auto-generated catch block
                e.printStackTrace();
            }
            return answer;
        }
    }

Answer 1

当jsonResult为-1时，您有一个return语句，导致onPostExecute()返回而调用pDialog.dismiss()：

if(jsonResult == -1){
    Toast.makeText(ShowSlots.this, "ALL Slots Are Available", Toast.LENGTH_LONG).show();
    return;
}

在不关闭对话框的情况下，它看起来好像应用程序仍在等待。您需要检查代码并确保在onPostExecute()返回之前始终关闭对话框;

活动在onPostExecute方法中冻结特定的JSON响应

1 个答案: