反向地理编码-显示位置信息

GeocodeingAPI的使用：

http://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&sensor=false

json 表示：返回的数据类型

接着是经纬值（北纬，西经）

表示是否来自某个设备的传感器。

下面的实例：用到异步操作，HttpURLConnection/HttpClient ，JSON的解析

package com.example.locationmanager;

import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Build;
import android.os.Handler;
import android.os.Message;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;

public class MainActivity extends AppCompatActivity {
private TextView posiotionTextView;
private LocationManager locationManager;
private String provider;
public static final int SHOW_LOCATION = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

posiotionTextView =(TextView) findViewById(R.id.position_text_view);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//获取所有可用的位置提供器
List<String> providerList = locationManager.getProviders(true);
//       if(providerList.contains(LocationManager.GPS_PROVIDER)){
//            provider = LocationManager.GPS_PROVIDER;
//          System.out.println(provider);
//       }else
//
if(providerList.contains(LocationManager.NETWORK_PROVIDER)){
provider = LocationManager.NETWORK_PROVIDER;
System.out.println(provider);

}else {
//当没有可用的位置提供器时，弹出Toast提示用户
Toast.makeText(this , " No Location provider to use",Toast.LENGTH_SHORT).show();
return;
}
if ( Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission( this, android.Manifest.permission.ACCESS_FINE_LOCATION ) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission( this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return  ;
}

Location locatio
4000
n = locationManager.getLastKnownLocation(provider);

if (location!=null){

showLocation(location);
}
locationManager.requestLocationUpdates(provider , 5000 , 1 ,locationListener);
}

@Override
protected void onDestroy() {
super.onDestroy();
if (locationManager!=null){
//关闭程序将监听器移除
locationManager.removeUpdates(locationListener);
}
}

LocationListener locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
//更新当前设备的位置信息
showLocation(location);

}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}
};

private  void showLocation(final Location location){//不加final无法在子线程中使用
new Thread(new Runnable() {
@Override
public void run() {
try {
//开始反向组装地理编码的接口地址。
StringBuilder url =new StringBuilder();
url.append("http://maps.googleapis.com/maps/api/geocode/json?latlng=");
url.append(location.getLatitude()).append(",");
url.append(location.getLongitude());
url.append("&sensor=false");//sensor传感器
System.out.println(url);

HttpURLConnection httpURLConnection = null;
URL url1 = new URL(url.toString());
httpURLConnection = (HttpURLConnection) url1.openConnection();
httpURLConnection.setRequestMethod("GET");
httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");
httpURLConnection.setRequestProperty("Accept-Language","zh-CN");
if(httpURLConnection.getResponseCode()==200){
InputStream in = httpURLConnection.getInputStream();
BufferedReader reader = new BufferedReader((new InputStreamReader(in)));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
response.append(line);
}

JSONObject jsonObject = new JSONObject(response.toString());
JSONArray resultArray = jsonObject.getJSONArray("results");
System.out.println("解析数据成功");
if (resultArray.length()>0) {
JSONObject subObject = resultArray.getJSONObject(0);//返回JSON的formatted_address在第0个JSON对象里

String address = subObject.getString("formatted_address");
Message message = new Message();
message.what = SHOW_LOCATION ;
message.obj = address ;
handler.sendMessage(message);

}

}

//                    HttpClient httpClient = new DefaultHttpClient();
//                    HttpGet httpGet = new HttpGet(url.toString());
//                    httpGet.addHeader("Accept-Language","zh-CN");
//                    HttpResponse httpResponse = httpClient.execute(httpGet);
//                    System.out.println("---"+url.toString());
//
//                    if (httpResponse.getStatusLine().getStatusCode()==200){
//                        System.out.println("---"+"请求成功");
//                        HttpEntity entity = httpResponse.getEntity();
//                        String response = EntityUtils.toString(entity,"utf-8");
//
//                        JSONObject jsonObject = new JSONObject(response);
//                        JSONArray resultArray = jsonObject.getJSONArray("results");
//                        System.out.println("解析数据成功");
//
//                        if (resultArray.length()>0) {
//                            JSONObject subObject = resultArray.getJSONObject(0);
//
//
//                            String address = subObject.getString("formatted_address");
//                            Message message = new Message();
//                            message.what = SHOW_LOCATION ;
//                            message.obj = address ;
//                            handler.sendMessage(message);
//
//                        }
//                    }

}catch (Exception e){
e.printStackTrace();
}
}
}).start();

//        String currentPosition = "latitude is " +location.getLatitude()+"\n"+"longitude is"+ location.getLongitude();
//        System.out.println(currentPosition);
//        posiotionTextView.setText(currentPosition);
}

private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what){
case SHOW_LOCATION:
String currentPosition = (String)msg.obj;
System.out.println(currentPosition);
posiotionTextView.setText(currentPosition);
break;
default:
break;

}
}
};

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.locationmanager">

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
</manifest>