本文将带你了解Android应用开发之Android学习-搜索Flickr网站实现方法，希望本文对大家学Android有所帮助。

今天的任务为搜索Flickr网站，代码如下：
FlickrFetchr.java:
package   com.bignerdranch.android.photogallery; import android.net.Uri;import   android.util.Log; import org.json.JSONArray;import   org.json.JSONException;import org.json.JSONObject; import   java.io.ByteArrayOutputStream;import java.io.IOException;import   java.io.InputStream;import java.net.HttpURLConnection;import   java.net.URL;import java.util.ArrayList;import java.util.List; public   class FlickrFetchr {    private static final String TAG =   "FlickrFetchr";     private static final   String API_KEY =   "REPLACE_ME_WITH_A_REAL_KEY";    private static   final String FETCH_RECENTS_METHOD =   "flickr.photos.getRecent";    private static   final String SEARCH_METHOD =   "flickr.photos.search";    private static final   Uri ENDPOINT =   Uri            .parse("https://api.flickr.com/services/rest/")            .buildUpon()            .appendQueryParameter("api_key",   API_KEY)            .appendQueryParameter("format",   "json")            .appendQueryParameter("nojsoncallback",   "1")            .appendQueryParameter("extras",   "url_s")            .build();     public   byte[] getUrlBytes(String urlSpec) throws IOException   {        URL url = new   URL(urlSpec);        HttpURLConnection   connection = (HttpURLConnection)url.openConnection();        try   {            ByteArrayOutputStream   out = new   ByteArrayOutputStream();            InputStream   in = connection.getInputStream();            if   (connection.getResponseCode() != HttpURLConnection.HTTP_OK)   {                throw   new IOException(connection.getResponseMessage()   +                        ":   with " +                        urlSpec);            }            int   bytesRead =   0;            byte[]   buffer = new   byte[1024];            while   ((bytesRead = in.read(buffer)) > 0) {                out.write(buffer,   0,   bytesRead);            }            out.close();            return   out.toByteArray();        } finally   {            connection.disconnect();        }    }     public   String getUrlString(String urlSpec) throws IOException   {        return new   String(getUrlBytes(urlSpec));    }     public   List<galleryitem> fetchRecentPhotos()   {        String url =   buildUrl(FETCH_RECENTS_METHOD, null);        return   downloadGalleryItems(url);    }     public   List<galleryitem> searchPhotos(String query)   {        String url = buildUrl(SEARCH_METHOD,   query);        return   downloadGalleryItems(url);    }     private   List<galleryitem> downloadGalleryItems(String url)   {        List<galleryitem>   items = new   ArrayList<>();         try   {            String   jsonString = getUrlString(url);            Log.i(TAG,   "Received JSON: " +   jsonString);            JSONObject   jsonBody = new JSONObject(jsonString);            parseItems(items,   jsonBody);        } catch   (IOException ioe)   {            Log.e(TAG,   "Failed to fetch items",   ioe);        } catch (JSONException   je)   {            Log.e(TAG,   "Failed to parse JSON", je);        }         return   items;    }     private String   buildUrl(String method, String query)   {        Uri.Builder uriBuilder =   ENDPOINT.buildUpon()                .appendQueryParameter("method",   method);         if (method.equals(SEARCH_METHOD))   {            uriBuilder.appendQueryParameter("text",   query);        }         return   uriBuilder.build().toString();    }     private   void parseItems(List<galleryitem> items, JSONObject   jsonBody)            throws   IOException, JSONException   {         JSONObject   photosJsonObject =   jsonBody.getJSONObject("photos");        JSONArray   photoJsonArray = photosJsonObject.getJSONArray("photo");         for   (int i = 0; i < photoJsonArray.length(); i++)   {            JSONObject   photoJsonObject = photoJsonArray.getJSONObject(i);             GalleryItem   item = new   GalleryItem();            item.setId(photoJsonObject.getString("id"));            item.setCaption(photoJsonObject.getString("title"));             if   (!photoJsonObject.has("url_s")) {                continue;            }             item.setUrl(photoJsonObject.getString("url_s"));            items.add(item);        }    } }</galleryitem></galleryitem></galleryitem></galleryitem></galleryitem>    

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