CODEWITHSUNDEEP
androidjsonlistviewandroid-studio
Rujuta
Rujuta

Reputation: 1

Get JSON response in listview and how to show it in listview?

I am a beginner in Android. I want to get a JSON response in a list and show it in a ListView . How to do this?
Here is my code for JSON post.

public class NewTest extends AppCompatActivity {    TextView
txtJson;
       Button btnOkay;
        @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_new_test);
            txtJson= (TextView) findViewById(R.id.txtJson);

           assert (findViewById(R.id.btnOkay)) != null;
           (findViewById(R.id.btnOkay)).setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {   new TaskPostWebService("written url here").execute(((TextView)   
findViewById(R.id.txtJson)).getText().toString());

               }
           });  }
       private class TaskPostWebService extends AsyncTask<String,Void,String> {
           private String url;
           private ProgressDialog progressDialog;
           private JSONParser jsonParser;

           public TaskPostWebService(String url ){

               this.url = url;
           }
           @Override
           protected void onPreExecute() {
               super.onPreExecute();
               progressDialog = ProgressDialog.show(NewTest.this,"","");
           }

           @Override
           protected String doInBackground(String... params) {

            String fact = "";
               try {

                   final MediaType JSON = MediaType.parse("application/json");

                   android.util.Log.e("charset", "charset - " + JSON.charset());
                   OkHttpClient client = new OkHttpClient();
       //Create a JSONObject with the data to be sent to the server
                   final JSONObject dataToSend = new JSONObject()
                           .put("nonce", "G9Ivek")
                           .put("iUserId", "477");

                   android.util.Log.e("data - ", "data - " + dataToSend.toString());
       //Create request object
                   Request request = new Request.Builder()
                           .url("written url here")
                           .post(RequestBody.create(JSON, dataToSend.toString().getBytes(Charset.forName("UTF-8"))))
                           .addHeader("Content-Type", "application/json")
                           .build();

                   android.util.Log.e("request - ", "request - " + request.toString());
                   android.util.Log.e("headers - ", "headers - " + request.headers().toString());
                   android.util.Log.e("body - ", "body - " + request.body().toString());
       //Make the request
                   Response response = client.newCall(request).execute();
                   android.util.Log.e("response", " " + response.body().string()); //Convert the response to String
                   String responseData = response.body().string();
       //Construct JSONObject of the response string
                   JSONObject dataReceived = new JSONObject(responseData);
       //See the response from the server
                   Log.i("response data", dataReceived.toString());
               }
               catch (Exception e){
                   e.printStackTrace();
               }
               return fact;
           }

           @Override
           protected void onPostExecute(String s) {
               super.onPostExecute(s);
               TextView text = (TextView) findViewById(R.id.txtJson);
               text.setText(s); 
               progressDialog.dismiss();
           }
       }

So, how can I get a response in a list and show it in a ListView?

Upvotes: 0

Views: 1618

Answers (2)

Dilip
Dilip

Reputation: 2311

Welcome to stackOverflow, as you are beginner so before going to complete solutions, you can think and follow following steps.

1.Network request: For network request, we have lib volley(by Google) and retrofit(by Square). You can use this for network request and response.

2.JSON Parsing: You can used eigther GSON lib or using JSONObject/ jsonArray to parse json data. I'll recommend you to write your own parsing code for better understanding of JSON parsing.

3.ListView data binding: At this step, you should have parsed data in list(other data structure can be used to store data also). Create Adapter and bind listview with adapters.

I have not provided solutions for this, you should implement yourself and let me know for any doubts. Hope this should work.

Upvotes: 2

Geet Choubey
Geet Choubey

Reputation: 1077

ArrayList<JSONObject> arrayListJson;
ArrayList<String> arrayList;
ArrayAdapter<String> adapter;
ListView listView = (ListView) fragmentView.findViewById(R.id.listView);
adapter = new ArrayAdapter<> (getActivity(), android.R.layout.simple_list_item_1, arrayList);
listView.setAdapter(adapter);

now in a separate thread:

JSONObject jResponse = new JSONObject(responseStr);
JSONArray jArray= jResponse.getJSONArray("OUTER_KEY");
for (int i = 0; i < jArray.length(); i++) {
    JSONObject jsonObject = jArray.getJSONObject(i);
    arrayList.add(jsonObject.optString("INNER_KEY"));
    arrayListJson.add(jsonObject);
}
adapter.notifyDataSetChanged();

Upvotes: 0

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