CODEWITHSUNDEEP
javaandroidjson
POOJA GUPTA
POOJA GUPTA

Reputation: 2355

errors in extracting json object

I have to retrieve json object from json file from this url.

My code is throwing java.lang.RuntimeException in doInBackground() and string to jsonObject conversion exception. Can anyone help me at this? I am new to Android programming. 

package course.examples.networkingearthquake;


import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.os.AsyncTask;
import android.widget.Button;
import android.view.View;
import android.widget.TextView;
import android.widget.EditText;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;


import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import android.net.http.AndroidHttpClient;

public class HttpActivity extends ActionBarActivity {

TextView mTextView;
EditText etInput;
TextView input;
String number;//edited
int num;//edited
  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_socket);

        mTextView = (TextView)findViewById(R.id.text1);
        input = (TextView)findViewById(R.id.input);
        etInput = (EditText)findViewById(R.id.etInput);
        input.setText("Input");

        //number = etInput.getText().toS();

        final Button btDisplay = (Button)findViewById(R.id.btDisplay);
        btDisplay.setText("DISPLAY");

        btDisplay.setOnClickListener(new View.OnClickListener(){
             public void onClick(View v) {

                new HttpGetTask().execute();

               }
        });
  }


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

       private static final String TAG = "HttpGetTask";
       private static final String URL = "http://earthquake.usgs.gov/earthquakes/feed/geojsonp/2.5/week";

       AndroidHttpClient mClient = AndroidHttpClient.newInstance("");                                           

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

           HttpGet request = new HttpGet(URL);
           JSONResponseHandler responseHandler = new JSONResponseHandler();
          // ResponseHandler<String> responseHandler = new BasicResponseHandler();

           try{

               return mClient.execute(request,responseHandler);

           }catch(ClientProtocolException exception){
             exception.printStackTrace();
           }catch(IOException exception){
              exception.printStackTrace(); 
           }
            return null;
           }

      @Override
      protected void onPostExecute(String result){
          if(null != mClient)
              mClient.close();
          mTextView.setText(result);
      }

   }
private class JSONResponseHandler implements ResponseHandler<String>{


    @Override
    public String handleResponse(HttpResponse response)
    throws ClientProtocolException, IOException {
        String result = null;
        String JSONResponse = new BasicResponseHandler().handleResponse(response);
        JSONResponse = JSONResponse.substring(17, JSONResponse.length()-3);
        num = Integer.parseInt(number);// edited
        try {
            JSONObject responseObject = (JSONObject) new JSONTokener(
                    JSONResponse).nextValue();
            JSONArray features = responseObject.getJSONArray("features");
            JSONObject retObject = (JSONObject)features.get(num);//edited
        //  JSONObject geometry = (JSONObject)retObject.get("geometry");

            result  = retObject.toString();
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return result;
    }
  }

Upvotes: 0

Views: 180

Answers (1)

Boren
Boren

Reputation: 101

The JSON returned by the URL you specify containts eqfeed_callback() which needs to be stripped in order to make it valid JSON.

It seems like you have done this in your response handler, but you are cutting off one character too much at both the start and the end.

Try this:

JSONResponse = JSONResponse.substring(16, JSONResponse.length()-2);

Upvotes: 1

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