Android Open Source - EarthquakeAPIViewer Call Api

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License

The source code is released under:

Apache License

Java Source Code

package com.example.earthquakeapiviewer;
// ww w .j  ava  2 s.c  o m
import org.json.*;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;

import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.AsyncTask;
import android.util.Log;

public class CallApi extends AsyncTask<Void, Void, ArrayList<Earthquake>> {
  MainActivity _activity;
  ArrayList<Earthquake> _arrayList;
  ProgressDialog _progressDialog;
  boolean _hasInternetConnection;
  
  public CallApi(MainActivity activity){
    super();
    _activity = activity;
    _arrayList = new ArrayList<Earthquake>();

     _hasInternetConnection = true;
  }
  
  @Override
  protected ArrayList<Earthquake> doInBackground(Void...params) {
    String apiUrl = "http://api.geonames.org/earthquakesJSON?formatted=true&north=44.1&south=-9.9&east=-22.4&west=55.2&username=mkoppelman";
    InputStream inputStream;
    String jsonString = "";
    
    try {
       
      URL url = new URL(apiUrl);
      HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
      
      inputStream = new BufferedInputStream(urlConnection.getInputStream());
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
        StringBuilder sb = new StringBuilder();

        String line = null;
        while ((line = reader.readLine()) != null)
        {
            sb.append(line + "\n");
        }
        
        jsonString = sb.toString();
        inputStream.close();
        

      parseJson(jsonString);
    } catch (IOException e) {
      
      Log.e("HTTP Request", e.getMessage());
      _hasInternetConnection = false;
       
    } catch (JSONException je) {
      Log.e("JSON Parser", je.getMessage());
    }
    
        return _arrayList;
 
    }
  
   @Override
    protected void onPreExecute() {
     super.onPreExecute();

     _progressDialog = ProgressDialog.show(_activity, "Loading", "Fetching earthquake data!");
    }
  
  @Override
  protected void onPostExecute(ArrayList<Earthquake> result) {
    super.onPostExecute(result);
    if(_hasInternetConnection) {
      
        for(Earthquake eq : result) {
          eq.getAddresses(_activity.getBaseContext());
        }
        
      _activity.updateData(result);
      _progressDialog.dismiss();
    } else {
      _progressDialog.dismiss();
      
      AlertDialog.Builder adBuilder = new AlertDialog.Builder(_activity);
       
      adBuilder.setMessage("Check your connection and try again.")
        .setTitle("No Internet Access")
        .setPositiveButton("OK", new OnClickListener() {
      
          @Override
          public void onClick(DialogInterface dialog, int which) {
            return;
          }
        }).create();
      
      adBuilder.show();
    }
  }
  
  private void parseJson(String json) throws JSONException {
    
    JSONObject jObject = new JSONObject(json);
    JSONArray jArray = jObject.getJSONArray("earthquakes");
    
    for(int i = 0; i<jArray.length(); i++)
    {  
      _arrayList.add(new Earthquake(jArray.getJSONObject(i)));
    } 
  }
}

Java Source Code List

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