Android 如果JSON中没有任何项目，如何向我们敬酒？

当JSON为空时，显示以下错误：org.JSON.JSONException: 回答列表没有值

下面是使用截击的StringRequest。我正在获取ListView中的所有详细信息

 try {
                        //getting the whole json object from the response
                        JSONObject obj = new JSONObject(response);
                        Log.e("ResponSe",response);



                        //we have the array named hero inside the object
                        //so here we are getting that json array
                        JSONArray heroArray = obj.getJSONArray("answerList");


                        //now looping through all the elements of the json array
                        for (int i = 0; i < heroArray.length(); i++) {

                            //getting the json object of the particular index inside the array
                            JSONObject heroObject = heroArray.getJSONObject(i);



                            //creating a hero object and giving them the values from json object
                            ViewAnswersModel hero = new ViewAnswersModel(heroObject.getString("answer"),
                                    heroObject.getString("answerdate"),
                                    heroObject.getString("school_name"),
                                    heroObject.getString("school_logo"),
                                    heroObject.getString("attachment"));






                            //adding the hero to herolist
                            heroList.add(hero);
                        }

**

如何显示未找到条目的祝酒词

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**

使用try catch处理异常，并在catch块中预成型Toast

请这样做：

            JSONObject parentObject = new JSONObject(response);

            JSONArray jsonArray = parentObject.getJSONArray("answerList");
            if (jsonArray.length() == 0) {
                // No Data
            }else{
               //have data
               }

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ifanswerlist.size==0.show；这对我不管用！长度还是大小？大小代表arrayList，长度代表jsonArrayYou’不客气，您可以标记答案正确并向上投票谢谢。@JakeB请不要；Don’不要要求别人对你的答案投赞成票。如果它是好的，社区将投票支持它。

try {
  // attempt to parse json
} catch(JSONException exception) {
  Toast.makeText(this, "No response from server", Toast.LENGTH_LONG).show();
}  

            JSONObject parentObject = new JSONObject(response);

            JSONArray jsonArray = parentObject.getJSONArray("answerList");
            if (jsonArray.length() == 0) {
                // No Data
            }else{
               //have data
               }