Question

JSON数据格式： 我试图获取这个数组json数据，但没有得到它。

[{"Items":"Chicken Burger","Price":"250","Quantity":"2"}, 
{"Items":"Hamburger","Price":"230","Quantity":"3"}]

MyCartActivity类： 我尝试使用Volley，我现在得到JSONArray无法转换为JSONObject错误。你能提一下改变的地方，以便我可以得到我的数据吗？

 final JsonObjectRequest request = new JsonObjectRequest (Request.Method.POST, fetchurl, null, new  Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {

            try {

                JSONArray jsonArray = response.getJSONArray("");

                for (int i=0; i < jsonArray.length(); i++){

                    JSONObject object = jsonArray.getJSONObject(i);

                    String Price = object.getString("Price");
                    String Name = object.getString("Items");
                    String Quantity = object.getString("Quantity");

                    adapter = new CartAdapter(MyCartActivity.this, list);
                    list.add(new CartPojo(Price, Name, Quantity));
                    adapter.notifyDataSetChanged();

                    progressbar.setVisibility(View.GONE);
                }

            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            error.printStackTrace();
        }
    });

     requestQueue.add(request);
  }

适配器类：

    public CartAdapter(Activity activity, List datalist) {

    this.activity = activity;
    this.datalist = datalist;
   }

   @Override
   public int getCount() {
   return datalist.size();
  }

  @Override
  public Object getItem(int position) {
    return datalist.get(position);
 }

  @Override
  public long getItemId(int position) {
    return position;
 }

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {

    if (inflater == null)
        inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    if (convertView == null)
        convertView = inflater.inflate(R.layout.cart_item_layout, null);

    TextView ItemName = convertView.findViewById(R.id.item_name);
    TextView Price = convertView.findViewById(R.id.item_price);
    TextView Quantity = convertView.findViewById(R.id.items_quantity);

    CartPojo pojo = datalist.get(position);

    ItemName.setText(String.valueOf(pojo.getName()));
    Price.setText(String.valueOf(pojo.getPrice()));
    Quantity.setText(String.valueOf(pojo.getQuantity()));

    return convertView;
  }

请给我一些解决方案......

Answer 1

无法将响应解析为JSONObject，因为它不是，而是JSONArray。您可以发送一个简单的StringRequest，然后使用JSONArray构造函数将响应字符串解析为JSONArray(response)。

StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
            new Response.Listener<String>() {
    @Override
    public void onResponse(String response) {
        JSONArray arr = new JSONArray(response);
    }
}, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {

    }
});

或使用JsonArrayRequest。 Here's一个例子。

使用Volley解析android中的JSON数组数据

1 个答案: