Parse JSON returned from Flickr Services

Further work on the last exercise "Access Flickr API using HttpClient", a method ParseJSON() is implemented to parse the JSON returned from Flickr Services.

package com.exercise.AndroidFlickr;



import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.Reader;



import org.apache.http.HttpEntity;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;



import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;



public class AndroidFlickrActivity extends Activity {



/*

 * FlickrQuery = FlickrQuery_url

 * + FlickrQuery_per_page

 * + FlickrQuery_nojsoncallback

 * + FlickrQuery_format

 * + FlickrQuery_tag + q

 * + FlickrQuery_key + FlickrApiKey

 */

   

String FlickrQuery_url = "http://api.flickr.com/services/rest/?method=flickr.photos.search";

String FlickrQuery_per_page = "&per_page=1";

String FlickrQuery_nojsoncallback = "&nojsoncallback=1";

String FlickrQuery_format = "&format=json";

String FlickrQuery_tag = "&tags=";

String FlickrQuery_key = "&api_key=";



// Apply your Flickr API:

// www.flickr.com/services/apps/create/apply/?

String FlickrApiKey = "2155e9406043b7494453105eec99ae37";



EditText searchText;

   Button searchButton;

   TextView textQueryResult, textJsonResult;



   /** Called when the activity is first created. */

   @Override

   public void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.main);

      

       searchText = (EditText)findViewById(R.id.searchtext);

       searchButton = (Button)findViewById(R.id.searchbutton);

       textQueryResult = (TextView)findViewById(R.id.queryresult);

       textJsonResult = (TextView)findViewById(R.id.jsonresult);

      

       searchButton.setOnClickListener(searchButtonOnClickListener);

   }

  

   private Button.OnClickListener searchButtonOnClickListener

   = new Button.OnClickListener(){



 public void onClick(View arg0) {

  // TODO Auto-generated method stub

  String searchQ = searchText.getText().toString();

  String searchResult = QueryFlickr(searchQ);

  textQueryResult.setText(searchResult);

  String jsonResult = ParseJSON(searchResult);

  textJsonResult.setText(jsonResult);

 }};

  

   private String QueryFlickr(String q){

   

    String qResult = null;

   

    String qString =

      FlickrQuery_url

      + FlickrQuery_per_page

      + FlickrQuery_nojsoncallback

      + FlickrQuery_format

      + FlickrQuery_tag + q 

      + FlickrQuery_key + FlickrApiKey;

   

    HttpClient httpClient = new DefaultHttpClient();

       HttpGet httpGet = new HttpGet(qString);

      

       try {

  HttpEntity httpEntity = httpClient.execute(httpGet).getEntity();

 

  if (httpEntity != null){

   InputStream inputStream = httpEntity.getContent();

   Reader in = new InputStreamReader(inputStream);

   BufferedReader bufferedreader = new BufferedReader(in);

   StringBuilder stringBuilder = new StringBuilder();

  

   String stringReadLine = null;

  

   while ((stringReadLine = bufferedreader.readLine()) != null) {

    stringBuilder.append(stringReadLine + "\n");

    }

  

   qResult = stringBuilder.toString();



  }

 

 } catch (ClientProtocolException e) {

  // TODO Auto-generated catch block

  e.printStackTrace();

 } catch (IOException e) {

  // TODO Auto-generated catch block

  e.printStackTrace();

 }

      

       return qResult;

   }

  

   private String ParseJSON(String json){

   

    String jResult = null;

   

    try {

  JSONObject JsonObject = new JSONObject(json);

  JSONObject Json_photos = JsonObject.getJSONObject("photos");

  JSONArray JsonArray_photo = Json_photos.getJSONArray("photo");

 

  //We have only one photo in this exercise

  JSONObject FlickrPhoto = JsonArray_photo.getJSONObject(0);

 

  jResult = "\nid: " + FlickrPhoto.getString("id") + "\n"

    + "owner: " + FlickrPhoto.getString("owner") + "\n"

    + "secret: " + FlickrPhoto.getString("secret") + "\n"

    + "server: " + FlickrPhoto.getString("server") + "\n"

    + "farm: " + FlickrPhoto.getString("farm") + "\n"

    + "title: " + FlickrPhoto.getString("title") + "\n";

 

 } catch (JSONException e) {

  // TODO Auto-generated catch block

  e.printStackTrace();

 }

   

    return jResult;

   

   }

}

Modify main.xml to add a TextView, jsonresult, to display the parsed JSON data.

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

   android:orientation="vertical"

   android:layout_width="fill_parent"

   android:layout_height="fill_parent"

   >

<TextView 

   android:layout_width="fill_parent"

   android:layout_height="wrap_content"

   android:text="@string/hello"

   />

<EditText

   android:id="@+id/searchtext"

   android:layout_width="fill_parent"

   android:layout_height="wrap_content"

   />

<Button

   android:id="@+id/searchbutton"

   android:layout_width="fill_parent"

   android:layout_height="wrap_content"

   android:text="Search"

   />

<TextView 

   android:id="@+id/queryresult"

   android:layout_width="fill_parent"

   android:layout_height="wrap_content"

   />

<TextView 

   android:id="@+id/jsonresult"

   android:layout_width="fill_parent"

   android:layout_height="wrap_content"

   />

</LinearLayout>

next:

- Load photo from Flickr



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