Google地圖根據經緯度確定地點—JSON解析

JSON解析分為以下幾個步驟

1.下載url上的所有的json資料

package mars.com;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;public class HttpDownloader {// 根據URL下載檔案,前提是這個檔案當中的內容是文本,函數的傳回值就是文本當中的內容// 1.建立一個URL對象// 2.通過URL對象,建立一個HttpURLConnection對象// 3.得到InputStream// 4.從InputStream當中讀取資料private URL url;public String download(String urlStr) {StringBuffer sb = new StringBuffer();String line = null;BufferedReader buffer = null;try {url = new URL(urlStr);HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();buffer = new BufferedReader(new InputStreamReader(urlConn.getInputStream()));while ((line = buffer.readLine()) != null) {sb.append(line);}} catch (Exception e) {e.printStackTrace();} finally {try {buffer.close();} catch (IOException e) {e.printStackTrace();}}return sb.toString();}}

2.

package mars.com;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import org.json.JSONArray;import org.json.JSONObject;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class DemoMapJSONActivity extends Activity {private Button button;private TextView show;private EditText longitude;private EditText latitude;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);button = (Button) findViewById(R.id.location);show = (TextView) findViewById(R.id.show);longitude = (EditText) findViewById(R.id.longitude);latitude = (EditText) findViewById(R.id.latitude);button.setOnClickListener(new MyLocationListener());}class MyLocationListener implements OnClickListener {public void onClick(View v) {HttpDownloader HTT = new HttpDownloader();String strUrl = "http://maps.googleapis.com/maps/api/geocode/json?latlng="+ latitude.getText().toString()+ ","+ longitude.getText().toString()+ "&sensor=false&language=zh-CN";String jsonData = HTT.download(strUrl);StringBuffer buf = new StringBuffer();try {Map<String, Object> result = parseJson(jsonData);List<Map<String, Object>> all = (List<Map<String, Object>>) result.get("results");Iterator<Map<String, Object>> iterator = all.iterator();int i = 0;while (iterator.hasNext()) {Map<String, Object> map = iterator.next();buf.append("\n地址:" + map.get("formatted_address")+ "*********" + i++);break;}Map<String, Object> address_components = parseJson(jsonData);List<Map<String, Object>> all2 = (List<Map<String, Object>>) address_components.get("address_components");Iterator<Map<String, Object>> iterator2 = all2.iterator();int j = 0;while (iterator2.hasNext()) {Map<String, Object> map = iterator2.next();buf.append("\n地址:" + map.get("long_name") + "*********"+ j++);}} catch (Exception e) {e.printStackTrace();}show.setText(buf);}}private Map<String, Object> parseJson(String data) throws Exception {Map<String, Object> allMap = new HashMap<String, Object>();JSONObject allData = new JSONObject(data);// 全部的內容變為一個項JSONArray jsonArray = allData.getJSONArray("results");// 取出數組List<Map<String, Object>> all = new ArrayList<Map<String, Object>>();List<Map<String, Object>> all2 = new ArrayList<Map<String, Object>>();for (int i = 0; i < jsonArray.length(); i++) {Map<String, Object> map = new HashMap<String, Object>();JSONObject jsonObject = jsonArray.getJSONObject(i);map.put("formatted_address",jsonObject.getString("formatted_address"));all.add(map);if (i != 0) {continue;}// 只取出第一組完整資料,其他的都沒這組詳細JSONArray jsonArray2 = jsonObject.getJSONArray("address_components");for (int j = 0; j < jsonArray2.length(); j++) {Map<String, Object> map2 = new HashMap<String, Object>();JSONObject jsonObject3 = jsonArray2.getJSONObject(j);map2.put("long_name", jsonObject3.get("long_name"));all2.add(map2);System.out.println("****");}}allMap.put("results", all);// 所有的取出的簡直對的list，放到results底下了allMap.put("address_components", all2);return allMap;}}

3.main.xml檔案

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <EditText        android:id="@+id/longitude"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="114.3579530" />    <EditText        android:id="@+id/latitude"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="30.6096780" />    <Button        android:id="@+id/location"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="定位" />    <TextView        android:id="@+id/show"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="顯示" /></LinearLayout>

4.配置許可權

<uses-permission android:name="android.permission.INTERNET" />

怕有些人看不懂代碼，在此說明以下，我這裡只是解析的我需要的最詳細地址，其實這個json已經足夠複雜了，但是我實際上是經過偷工減料的，我只取了最詳細的一組資料

以及最詳細的分組資料。所以沒有用到工具類。

本來應該用工具類來著，比如說裡面的results應該單獨是一個類才行，但是我沒有用他的其他的屬性，所以沒有詳細的解析。

如果想使用它的其他的屬性，比如說address_components，formatted_address
，geometry，types。那你得詳細的把這個類的結構寫出來，然後以索引值對的形式放到List中，然後你想取哪個資料都可以了，就看你了。

json資料如下

{   "results" : [      {         "address_components" : [            {               "long_name" : "1178號",               "short_name" : "1178號",               "types" : [ "street_number" ]            },            {               "long_name" : "和平大道",               "short_name" : "和平大道",               "types" : [ "route" ]            },            {               "long_name" : "武昌區",               "short_name" : "武昌區",               "types" : [ "sublocality", "political" ]            },            {               "long_name" : "武漢",               "short_name" : "武漢",               "types" : [ "locality", "political" ]            },            {               "long_name" : "湖北省",               "short_name" : "湖北省",               "types" : [ "administrative_area_level_1", "political" ]            },            {               "long_name" : "中國",               "short_name" : "CN",               "types" : [ "country", "political" ]            }         ],         "formatted_address" : "中國湖北省武漢市武昌區和平大道1178號",         "geometry" : {            "location" : {               "lat" : 30.61071999999999,               "lng" : 114.3566410            },            "location_type" : "ROOFTOP",            "viewport" : {               "northeast" : {                  "lat" : 30.61206898029149,                  "lng" : 114.3579899802915               },               "southwest" : {                  "lat" : 30.60937101970850,                  "lng" : 114.3552920197085               }            }         },         "types" : [ "street_address" ]      },      {         "address_components" : [            {               "long_name" : "武昌區",               "short_name" : "武昌區",               "types" : [ "sublocality", "political" ]            },            {               "long_name" : "武漢",               "short_name" : "武漢",               "types" : [ "locality", "political" ]            },            {               "long_name" : "湖北省",               "short_name" : "湖北省",               "types" : [ "administrative_area_level_1", "political" ]            },            {               "long_name" : "中國",               "short_name" : "CN",               "types" : [ "country", "political" ]            }         ],         "formatted_address" : "中國湖北省武漢市武昌區",         "geometry" : {            "bounds" : {               "northeast" : {                  "lat" : 30.62807880,                  "lng" : 114.42031060               },               "southwest" : {                  "lat" : 30.49578920,                  "lng" : 114.26042410               }            },            "location" : {               "lat" : 30.5538990,               "lng" : 114.3158970            },            "location_type" : "APPROXIMATE",            "viewport" : {               "northeast" : {                  "lat" : 30.62807880,                  "lng" : 114.42031060               },               "southwest" : {                  "lat" : 30.49578920,                  "lng" : 114.26042410               }            }         },         "types" : [ "sublocality", "political" ]      },      {         "address_components" : [            {               "long_name" : "武漢",               "short_name" : "武漢",               "types" : [ "locality", "political" ]            },            {               "long_name" : "湖北省",               "short_name" : "湖北省",               "types" : [ "administrative_area_level_1", "political" ]            },            {               "long_name" : "中國",               "short_name" : "CN",               "types" : [ "country", "political" ]            }         ],         "formatted_address" : "中國湖北省武漢市",         "geometry" : {            "bounds" : {               "northeast" : {                  "lat" : 31.36126030,                  "lng" : 115.08257280               },               "southwest" : {                  "lat" : 29.96907670,                  "lng" : 113.70228110               }            },            "location" : {               "lat" : 30.5930870,               "lng" : 114.3053570            },            "location_type" : "APPROXIMATE",            "viewport" : {               "northeast" : {                  "lat" : 30.78745989999999,                  "lng" : 114.6189880               },               "southwest" : {                  "lat" : 30.34877210,                  "lng" : 113.9817810               }            }         },         "types" : [ "locality", "political" ]      },      {         "address_components" : [            {               "long_name" : "湖北省",               "short_name" : "湖北省",               "types" : [ "administrative_area_level_1", "political" ]            },            {               "long_name" : "中國",               "short_name" : "CN",               "types" : [ "country", "political" ]            }         ],         "formatted_address" : "中國湖北省",         "geometry" : {            "bounds" : {               "northeast" : {                  "lat" : 33.27561610,                  "lng" : 116.13484340               },               "southwest" : {                  "lat" : 29.02948840,                  "lng" : 108.36696460               }            },            "location" : {               "lat" : 30.5458610,               "lng" : 114.3419210            },            "location_type" : "APPROXIMATE",            "viewport" : {               "northeast" : {                  "lat" : 33.27561610,                  "lng" : 116.13484340               },               "southwest" : {                  "lat" : 29.02948840,                  "lng" : 108.36696460               }            }         },         "types" : [ "administrative_area_level_1", "political" ]      },      {         "address_components" : [            {               "long_name" : "中國",               "short_name" : "CN",               "types" : [ "country", "political" ]            }         ],         "formatted_address" : "中國",         "geometry" : {            "bounds" : {               "northeast" : {                  "lat" : 53.56097399999999,                  "lng" : 134.772810               },               "southwest" : {                  "lat" : 18.15352160,                  "lng" : 73.49941369999999               }            },            "location" : {               "lat" : 35.861660,               "lng" : 104.1953970            },            "location_type" : "APPROXIMATE",            "viewport" : {               "northeast" : {                  "lat" : 53.56097399999999,                  "lng" : 134.772810               },               "southwest" : {                  "lat" : 18.15352160,                  "lng" : 73.49941369999999               }            }         },         "types" : [ "country", "political" ]      }   ],   "status" : "OK"}