Android进阶教程之---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:

"1.0" encoding="utf-8"?>
""
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

    android:id="@+id/longitude"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="longitude:"
    />

    android:id="@+id/latitude"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="latitude:"
    />

    android:id="@+id/address"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns: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 lstAddress = gc.getFromLocation(geoLatitude,
                         geoLongitude, 1);
                 if (lstAddress.size() > 0) {
                     result = lstAddress.get(0);
                 }
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
         return result;
     }
}

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=""
      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>

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns: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: