Java tutorial
/* * Copyright (C) 2011 The Android Open Source Project * Copyright (C) 2014 Zhenghong Wang * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.apis.ifashion; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.net.SocketTimeoutException; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; 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.conn.ConnectTimeoutException; import org.w3c.dom.Document; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; import android.content.Context; import android.widget.Toast; class WOEIDUtils { public static final String WOEID_NOT_FOUND = "WOEID_NOT_FOUND"; private static final String WOEID_QUERY_PREFIX_FIND_BY_PLACE = "http://query.yahooapis.com/v1/public/yql?q=select*from%20geo.places%20where%20text="; private static final String WOEID_QUERY_SUFFIX_FORMAT = "&format=xml"; private static final String WOEID_QUERY_PREFIX_FIND_BY_GPS = "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20geo.placefinder%20where%20text%3D%22"; private static final String WOEID_QUERY_CONSECTION_FIND_BY_GPS = "%2C"; private static final String WOEID_QUERY_SUFFIX_FIND_BY_GPS = "%22%20and%20gflags%3D%22R%22"; private String yahooAPIsQuery; private Map<String, String> mParsedResult; private static WOEIDUtils mInstance = new WOEIDUtils(); public static WOEIDUtils getInstance() { return mInstance; } public String getWOEIDlocation() { String res = ""; Iterator<String> it = mParsedResult.keySet().iterator(); while (it.hasNext()) { Object o = it.next(); res += (o + " = " + mParsedResult.get(o)) + "\n"; } return res; } public String getWOEID(Context context, String cityName) { return queryWOEIDfromYahooAPIs(context, cityName); } public String getWOEID(Context context, String lat, String lon) { return queryWOEIDfromYahooAPIs(context, lat, lon); } private String queryWOEIDfromYahooAPIs(Context context, String uriPlace) { YahooWeatherLog.d("Query WOEID by name of place"); yahooAPIsQuery = WOEID_QUERY_PREFIX_FIND_BY_PLACE + "%22" + uriPlace + "%22" + WOEID_QUERY_SUFFIX_FORMAT; yahooAPIsQuery = yahooAPIsQuery.replace(" ", "%20"); YahooWeatherLog.d("Query WOEID: " + yahooAPIsQuery); String woeidString = fetchWOEIDxmlString(context, yahooAPIsQuery); Document woeidDoc = convertStringToDocument(context, woeidString); return getFirstMatchingWOEID(woeidDoc); } private String queryWOEIDfromYahooAPIs(Context context, String lat, String lon) { YahooWeatherLog.d("Query WOEID by latlon"); yahooAPIsQuery = WOEID_QUERY_PREFIX_FIND_BY_GPS + lat + WOEID_QUERY_CONSECTION_FIND_BY_GPS + lon + WOEID_QUERY_SUFFIX_FIND_BY_GPS; yahooAPIsQuery = yahooAPIsQuery.replace(" ", "%20"); YahooWeatherLog.d("Query WOEID: " + yahooAPIsQuery); String woeidString = fetchWOEIDxmlString(context, yahooAPIsQuery); Document woeidDoc = convertStringToDocument(context, woeidString); return getFirstMatchingWOEID(woeidDoc); } private String fetchWOEIDxmlString(Context context, String queryString) { YahooWeatherLog.d("fetch WOEID xml string"); String qResult = ""; HttpClient httpClient = NetworkUtils.createHttpClient(); HttpGet httpGet = new HttpGet(queryString); 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 readLine = null; while ((readLine = bufferedreader.readLine()) != null) { YahooWeatherLog.d(readLine); stringBuilder.append(readLine + "\n"); } qResult = stringBuilder.toString(); } } catch (ClientProtocolException e) { e.printStackTrace(); Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show(); } catch (ConnectTimeoutException e) { e.printStackTrace(); Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show(); } catch (SocketTimeoutException e) { e.printStackTrace(); Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show(); } catch (IOException e) { e.printStackTrace(); Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show(); } finally { httpClient.getConnectionManager().shutdown(); } return qResult; } private Document convertStringToDocument(Context context, String src) { YahooWeatherLog.d("convert string to document"); Document dest = null; DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder parser; try { parser = dbFactory.newDocumentBuilder(); dest = parser.parse(new ByteArrayInputStream(src.getBytes())); } catch (ParserConfigurationException e1) { e1.printStackTrace(); Toast.makeText(context, e1.toString(), Toast.LENGTH_LONG).show(); } catch (SAXException e) { e.printStackTrace(); Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show(); } catch (IOException e) { e.printStackTrace(); Toast.makeText(context, e.toString(), Toast.LENGTH_LONG).show(); } return dest; } private String getFirstMatchingWOEID(Document srcDoc) { YahooWeatherLog.d("get first matching WOEID"); try { mParsedResult = new HashMap<String, String>(); for (int i = 1; i <= 4; i++) { String name = "line" + i; parseLocationLines(srcDoc, name); } NodeList nodeListDescription = srcDoc.getElementsByTagName("woeid"); if (nodeListDescription.getLength() > 0) { Node node = nodeListDescription.item(0); return node.getTextContent(); } else { return WOEID_NOT_FOUND; } } catch (Exception e) { e.printStackTrace(); return WOEID_NOT_FOUND; } } private void parseLocationLines(Document srcDoc, String name) { NodeList nodeList = srcDoc.getElementsByTagName(name); if (nodeList.getLength() > 0) { Node node = nodeList.item(0); mParsedResult.put(name, node.getTextContent()); } } }