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;
        }
    }
}