Android高手进阶教程(十五)之---通过Location获取Address的使用！

我们获取Location的目的之一肯定是有获取这个位置的详细地址，而我们有了Location在来获取Address就相对简单多了，因为GoogleApi已经封装好了方法，我们只需呀通过Location获取GeoPoint,然后在通过GeoPoint来获取我们想要的Address.下面是我做的一个简单的Demo.

第一步新建一个Android工程LocationDemo，注意这里选用的是(Google APIs)，下面是文件目录结构：

第二步： 修改main.xml(相比第十四节增加了一个address的TextView)，代码如下:

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

第三步:修改LocationDemo.java(增加了两个方法)代码如下:

package com.android.tutor;  
import java.util.List;  
import java.util.Locale;  
import com.google.android.maps.GeoPoint;  
import android.app.Activity;  
import android.content.Context;  
import android.location.Address;  
import android.location.Geocoder;  
import android.location.Location;  
import android.location.LocationManager;  
import android.os.Bundle;  
import android.widget.TextView;  
public class LocationDemo extends Activity {  
     
    private TextView longitude;  
    private TextView latitude;  
    private TextView address;  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        longitude = (TextView)findViewById(R.id.longitude);  
        latitude = (TextView)findViewById(R.id.latitude);  
        address = (TextView)findViewById(R.id.address);  
          
        Location mLocation = getLocation(this);  
        GeoPoint gp = getGeoByLocation(mLocation);  
        Address mAddress = getAddressbyGeoPoint(this, gp);           
          
        longitude.setText("Longitude: " + mLocation.getLongitude());  
        latitude.setText("Latitude: " + mLocation.getLatitude());  
        address.setText("Address: " + mAddress.getCountryName()+"," + mAddress.getLocality());  
    }  
      
    //Get the Location by GPS or WIFI  
    public Location getLocation(Context context) {  
        LocationManager locMan = (LocationManager) context  
                .getSystemService(Context.LOCATION_SERVICE);  
        Location location = locMan  
                .getLastKnownLocation(LocationManager.GPS_PROVIDER);  
        if (location == null) {  
            location = locMan  
                    .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);  
        }  
        return location;  
    }  
    //通过Location获取GeoPoint  
     public  GeoPoint getGeoByLocation(Location location) {  
         GeoPoint gp = null;  
         try {  
             if (location != null) {  
                 double geoLatitude = location.getLatitude() * 1E6;  
                 double geoLongitude = location.getLongitude() * 1E6;  
                 gp = new GeoPoint((int) geoLatitude, (int) geoLongitude);  
             }  
         } catch (Exception e) {  
             e.printStackTrace();  
         }  
         return gp;  
     }  
     //通过GeoPoint来获取Address  
     public  Address getAddressbyGeoPoint(Context cntext, GeoPoint gp) {  
         Address result = null;  
         try {  
             if (gp != null) {  
                 Geocoder gc = new Geocoder(cntext, Locale.CHINA);  
                  
                 double geoLatitude = (int) gp.getLatitudeE6() / 1E6;  
                 double geoLongitude = (int) gp.getLongitudeE6() / 1E6;  
                   
                 List<Address> lstAddress = gc.getFromLocation(geoLatitude,  
                         geoLongitude, 1);  
                 if (lstAddress.size() > 0) {  
                     result = lstAddress.get(0);  
                 }  
             }  
         } catch (Exception e) {  
             e.printStackTrace();  
         }  
         return result;  
     }  
}

第四步:最重要一步在AndroidManiefest.xml中导入Google Api(第14行代码)库,代码如下:

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android"  
      package="com.android.tutor"  
      android:versionCode="1"  
      android:versionName="1.0">  
    <application android:icon="@drawable/icon" android:label="@string/app_name">  
        <activity android:name=".LocationDemo"  
                  android:label="@string/app_name">  
            <intent-filter>  
                <action android:name="android.intent.action.MAIN" />  
                <category android:name="android.intent.category.LAUNCHER" />  
            </intent-filter>  
        </activity>  
        <uses-library android:name="com.google.android.maps" />   
    </application>  
    <uses-sdk android:minSdkVersion="7" />  
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>  
</manifest>

第五步:运行上述工程，效果如下图如示: