如何通过使用Android代码从JSON响应中获取特定值? [英] How to get particular values from JSON response by using Android code?

问题描述

我需要获取特定对象值(A，B，C，D)和相关的键值(@"name" ).获取(A, B, C, D )对象值后，我需要列出到Android的列表视图中.在下面，我已经发布了示例代码和响应.请帮助我.

I need to get Particular Object values ( A, B, C, D) and related key values (@"name" ). After getting (A, B, C, D ) object values I need to list out into list view Android. Here below I have posted my sample code and response. Please help me.

@Override
        protected Void doInBackground(Void... arg0) {
            // Creating service handler class instance
            ServiceHandler sh = new ServiceHandler();

            // Making a request to url and getting response
            String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
            Log.d("Response: ", "> " + jsonStr);

            if (jsonStr != null) {
                try {
                    JSONObject jsonObj = new JSONObject(jsonStr);

                    contacts = jsonObj.getJSONArray("response");
                    Log.d("Response: ", "> " + contacts);

                    // looping through All Contacts
                    for (int i = 0; i < contacts.length(); i++) {
                        JSONObject c = contacts.getJSONObject(i);

                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            } else {
                Log.e("ServiceHandler", "Couldn't get any data from the url");
            }

            return null;
        }

我的JSON响应:

{"response" : [  {

                "A"   :  [   {  
                         "name" : "tango" 
                           },
                       {
                        "name" : "ping"
                       }
                     ],

                "B"  :  [   {  
                         "name" : "tango" 
                           },
                       {
                        "name" : "ping"
                       }
                    ]
             } ]}

推荐答案

使用 JSONObject keys()来获取密钥，然后迭代每个密钥以获取动态值.

Use JSONObject keys() to get the key and then iterate each key to get to the dynamic value.

您可以获得像这样的动态键

You can get dynamic keys like this

JSONObject responseDataObj = new JSONObject(responseData);
JSONArray responseArray = responseDataObj.getJSONArray("response");
for (int i = 0; i < responseArray.length(); i++) {
    nodes = new ArrayList<ArrayList<String>>();//nodes ArrayList<ArrayList<String>> declared globally
    nodeSize = new ArrayList<Integer>();//nodeSize ArrayList<Integer> declared globally
    JSONObject obj = responseArray.getJSONObject(i);
    Iterator keys = obj.keys();
    while(keys.hasNext()) {
       // loop to get the dynamic key
       String currentDynamicKey = (String)keys.next();
       //store key in an arraylist which is A,B,...
       // get the value of the dynamic key
       JSONArray currentDynamicValue = obj.getJSONArray(currentDynamicKey);
       int jsonrraySize = currentDynamicValue.length();
       int sizeInArrayList = jsonrraySize + 1;
       nodeSize.add(sizeInArrayList);
       if(jsonrraySize > 0) {
           for (int ii = 0; ii < jsonrraySize; ii++) {
                nameList = new ArrayList<String>();//nameList ArrayList<String> declared globally
               if(ii == 0) {
                JSONObject nameObj = currentDynamicValue.getJSONObject(ii);
                String name = nameObj.getString("name");
                System.out.print("Name = " + name);
                //store name in an arraylist
                nameList.add(name);
              }
           }                    
       }
     nodes.add(nameList);
    }
}

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