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

大家好，上一节我讲了一下如何通过LocationManager来获取Location，没有看过上一节的同学，可以点击如下链接返回查看：

Android高手进阶教程十四之---Android Location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:

[java]
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<?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>

[java]
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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;

}
}

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:

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<?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>

<?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:



OK,今天就到这里，如果有什么不明白的，或者想要源代码的，请留下问题或者邮箱。Thx~