ANDROID_MARS学习笔记_S03_005_Geocoder、AsyncTask

一、代码
1.xml
(1)AndroidManifest.xml

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

2.java
(1)MainActivity.java

 package com.location3;

 import java.io.IOException;
 import java.util.List;

 import android.app.Activity;
 import android.location.Address;
 import android.location.Geocoder;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;

 public class MainActivity extends Activity {
     private Button geocodingButton = null;
     private Button reverseGeocodingButton = null;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         geocodingButton = (Button)findViewById(R.id.getLocationButton);
         reverseGeocodingButton = (Button)findViewById(R.id.getLocationNameButton);

         geocodingButton.setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
                 new GeocodingTask().execute(new Integer(1));
             }
         });

         reverseGeocodingButton.setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
                 new ReverseGeocodingTask().execute(new Integer(2));
             }
         });
     }

     private class GeocodingTask extends AsyncTask<Integer, Integer, Integer> {
         @Override
         protected Integer doInBackground(Integer... params) {
             //创建Geocoder对象，执行相关查询，但是存在未知BUG，导致服务不可用
             Geocoder geocoder = new Geocoder(MainActivity.this);
             try {
                 //SFO是美国机场的一个简称
                 List<Address> addresses = geocoder.getFromLocationName("SFO", 1);
                 System.out.println("GeocodingTask addresses--->");
                 for(Address address : addresses) {
                     System.out.println(address);
                 }
             } catch (IOException e) {
                 e.printStackTrace();
             }
             return null;
         }
     }

     private class ReverseGeocodingTask extends AsyncTask<Integer, Integer, Integer> {
         @Override
         protected Integer doInBackground(Integer... params) {
             Geocoder geocoder = new Geocoder(MainActivity.this);
             //根据给定的经纬度，查询符合条件的地址
             try {
                 List<Address> addresses = geocoder.getFromLocation(40.711442,-73.961452, 1);
                 System.out.println("ReverseGeocodingTask addresses -->");
                 for(Address address : addresses) {
                     System.out.println(address);
                 }
             } catch (IOException e) {
                 e.printStackTrace();
             }
             return null;
         }
     }
 }