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[NewFeature] Add locationg util.
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‎src/com/worthed/utils/LocationUtils.java

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/**
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* Copyright 2014 Zhenguo Jin (jingle1267@163.com)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.worthed.utils;
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import java.io.InputStream;
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import org.apache.http.HttpEntity;
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import org.apache.http.HttpResponse;
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import org.apache.http.client.HttpClient;
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import org.apache.http.client.methods.HttpGet;
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import org.apache.http.impl.client.DefaultHttpClient;
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import org.apache.http.params.BasicHttpParams;
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import org.apache.http.params.HttpConnectionParams;
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import org.apache.http.params.HttpParams;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.json.JSONObject;
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import android.text.TextUtils;
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import android.util.Log;
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/**
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* 根据经纬度查询地址信息和根据地址信息查询经纬度
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*
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* @author jingle1267@163.com
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*
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*/
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public class LocationUtils {
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private final static boolean DEBUG = true;
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private final static String TAG = "LocationUtils";
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/**
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* 根据地址获取对应的经纬度
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* @param address
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* @return
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*/
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public static double[] getLocationInfo(String address) {
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if (TextUtils.isEmpty(address)) {
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return null;
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}
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if (DEBUG) {
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LogUtils.d(TAG, "address : " + address);
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}
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// 定义一个HttpClient，用于向指定地址发送请求
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HttpClient client = new DefaultHttpClient();
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// 向指定地址发送GET请求
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HttpGet httpGet = new HttpGet("http://maps.google."
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+ "com/maps/api/geocode/json?address=" + address
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+ "ka&sensor=false");
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StringBuilder sb = new StringBuilder();
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try {
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// 获取服务器的响应
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HttpResponse response = client.execute(httpGet);
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HttpEntity entity = response.getEntity();
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// 获取服务器响应的输入流
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InputStream stream = entity.getContent();
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int b;
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// 循环读取服务器响应
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while ((b = stream.read()) != -1) {
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sb.append((char) b);
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}
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// 将服务器返回的字符串转换为JSONObject对象
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JSONObject jsonObject = new JSONObject(sb.toString());
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// 从JSONObject对象中取出代表位置的location属性
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JSONObject location = jsonObject.getJSONArray("results")
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.getJSONObject(0).getJSONObject("geometry")
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.getJSONObject("location");
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// 获取经度信息
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double longitude = location.getDouble("lng");
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// 获取纬度信息
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double latitude = location.getDouble("lat");
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if (DEBUG) {
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LogUtils.d(TAG, "location : (" + longitude + "," + latitude + ")");
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}
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// 将经度、纬度信息组成double[]数组
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return new double[] { longitude, latitude };
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 根据经纬度获取对应的地址
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* @param longitude
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* @param latitude
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* @param lang
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* @return
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* @throws Exception
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*/
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public static String getAddress(double longitude, double latitude,
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String lang) throws Exception {
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if (DEBUG) {
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LogUtils.d(TAG, "location : (" + longitude + "," + latitude + ")");
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}
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if (lang == null) {
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lang = "en";
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}
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// 设定请求的超时时间
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HttpParams params = new BasicHttpParams();
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HttpConnectionParams.setConnectionTimeout(params, 10 * 1000);
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HttpConnectionParams.setSoTimeout(params, 10 * 1000);
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// 定义一个HttpClient，用于向指定地址发送请求
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HttpClient client = new DefaultHttpClient(params);
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// 向指定地址发送GET请求
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HttpGet httpGet = new HttpGet("https://maps.googleapis.com/maps/api/"
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+ "geocode/json?latlng=" + latitude + "," + longitude
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+ "&sensor=false&language=" + lang);
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if (DEBUG) {
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LogUtils.d(TAG,
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"URL : " + httpGet.getURI());
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}
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StringBuilder sb = new StringBuilder();
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// 执行请求
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HttpResponse response = client.execute(httpGet);
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HttpEntity entity = response.getEntity();
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// 获取服务器响应的字符串
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InputStream stream = entity.getContent();
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int b;
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while ((b = stream.read()) != -1) {
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sb.append((char) b);
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}
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// 把服务器相应的字符串转换为JSONObject
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JSONObject jsonObj = new JSONObject(sb.toString());
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Log.d("ConvertUtil", "getAddress:" + sb.toString());
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// 解析出响应结果中的地址数据
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JSONObject addressObject = jsonObj.getJSONArray("results")
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.getJSONObject(0);
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String address = decodeLocationName(addressObject);
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if (DEBUG) {
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LogUtils.d(TAG, "address : " + address);
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}
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return address;
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}
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/**
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* 根据Google API 解析出国家和城市名称
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* https://developers.google.com/maps/documentation/geocoding
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*
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* @param jsonObject
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* @return
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*/
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public static String decodeLocationName(JSONObject jsonObject) {
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JSONArray jsonArray;
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String country = "", city = "";
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String TYPE_COUNTRY = "country";
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String TYPE_LOCALITY = "locality";
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String TYPE_POLITICAL = "political";
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boolean hasCountry = false;
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try {
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jsonArray = jsonObject.getJSONArray("address_components");
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for (int i = 0; i < jsonArray.length(); i++) {
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JSONObject jo = jsonArray.getJSONObject(i);
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JSONArray types = jo.getJSONArray("types");
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boolean hasLocality = false, hasPolicical = false;
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for (int j = 0; j < types.length(); j++) {
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String type = types.getString(j);
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if (type.equals(TYPE_COUNTRY) && !hasCountry) {
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country = jo.getString("long_name");
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} else {
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if (type.equals(TYPE_POLITICAL)) {
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hasPolicical = true;
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}
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if (type.equals(TYPE_LOCALITY)) {
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hasLocality = true;
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}
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if (hasPolicical && hasLocality) {
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city = jo.getString("long_name");
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}
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}
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}
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}
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return city + "," + country;
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} catch (JSONException e) {
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e.printStackTrace();
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}
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if (jsonObject.has("formatted_address")) {
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try {
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return jsonObject.getString("formatted_address");
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} catch (JSONException e) {
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e.printStackTrace();
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}
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}
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return null;
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}
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}

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