Android LocationManager获取经度与纬度等地理信息

package cc.bb; 
import java.util.Iterator; 
import java.util.List; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.widget.TextView; 
import android.app.Activity; 
import android.content.Context; 
/** 
* Demo描述: 
* 利用LocationManager实现定位功能 
* 1 实时更新经度,纬度 
* 2 根据经度和纬度获取地理信息(比如:国家,街道等)(略过) 
* 
* 
* 注意事项: 
* 0 在测试GPS定位时最好在较为宽广的空间,否则影响定位 
* 1 利用mLocationManager.getLastKnownLocation(GPSProvider)获取Location时常为null. 
*  因为设备定位是需要一定时间的,所以把定位逻辑放在LocationManager的requestLocationUpdates()方法 
*  
* 2 LocationManager.requestLocationUpdates 
*  (String provider, long minTime, float minDistance, LocationListener listener) 
*  第一个参数:位置信息的provider,比如GPS 
*  第二个参数:更新位置信息的时间间隔,单位毫秒 
*  第三个参数:更新位置信息的距离间隔,单位米 
*  第四个参数:位置信息变化时的回调 
*  
* 3 LocationListener中最重要的回调方法onLocationChanged() 
*  当minTime和minDistance同时满足时会调用该方法.文档说明: 
*  The minDistance parameter can also be used to control the 
*  frequency of location updates. If it is greater than 0 then the 
*  location provider will only send your application an update when 
*  the location has changed by at least minDistance meters, AND 
*  at least minTime milliseconds have passed. 
*  比如间隔时间(minTime)到了3秒并且移动的距离(minDistance)大于了5米 
*  那么就会调用该方法. 
*  
* 4 在Activity的onDestroy()时取消地理位置的更新. 
* 
* 
* 权限配置: 
* <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/  
* <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/  
* <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION"/  
* <uses-permission android:name="android.permission.INTERNET"/  
*/ 
public class MainActivity extends Activity { 
private Context mContext; 
private TextView mTextView; 
private LocationManager mLocationManager; 
private LocationListenerImpl mLocationListenerImpl; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 
init(); 
initLocationManager(mContext); 
} 
private void init(){ 
mContext=this; 
mTextView=(TextView) findViewById(R.id.textView); 
} 
private void initLocationManager(Context context){ 
mLocationManager=(LocationManager)context.getSystemService(Context.LOCATION_SERVICE); 
//获取可用的位置信息Provider.即passive,network,gps中的一个或几个 
List<String  providerList=mLocationManager.getProviders(true); 
for (Iterator<String  iterator = providerList.iterator(); iterator.hasNext();) { 
String provider = (String) iterator.next(); 
System.out.println("provider="+provider); 
} 
//在此采用GPS的方式获取位置信息 
String GPSProvider=LocationManager.GPS_PROVIDER; 
Location location=mLocationManager.getLastKnownLocation(GPSProvider); 
if (location!=null) { 
double longitude=location.getLongitude(); 
double altitude=location.getAltitude(); 
System.out.println("longitude="+longitude+",altitude="+altitude); 
} else { 
System.out.println("location==null"); 
} 
//注册位置监听 
mLocationListenerImpl=new LocationListenerImpl(); 
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 5, mLocationListenerImpl); 
} 
private class LocationListenerImpl implements LocationListener{ 
//当设备位置发生变化时调用该方法 
@Override 
public void onLocationChanged(Location location) { 
if (location!=null) { 
showLocation(location); 
} 
} 
//当provider的状态发生变化时调用该方法.比如GPS从可用变为不可用. 
@Override 
public void onStatusChanged(String provider, int status, Bundle extras) { 
} 
//当provider被打开的瞬间调用该方法.比如用户打开GPS 
@Override 
public void onProviderEnabled(String provider) { 
} 
//当provider被关闭的瞬间调用该方法.比如关闭打开GPS 
@Override 
public void onProviderDisabled(String provider) { 
} 
} 
private void showLocation(Location location) { 
// 获取经度 
double longitude = location.getLongitude(); 
// 获取纬度 
double altitude = location.getAltitude(); 
String message="经度为:"+longitude+"\n"+"纬度为:"+altitude; 
mTextView.setText(message); 
} 
@Override 
protected void onDestroy() { 
super.onDestroy(); 
if (mLocationManager!=null) { 
mLocationManager.removeUpdates(mLocationListenerImpl); 
} 
} 
} 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context=".MainActivity"   
<TextView 
android:id="@+id/textView" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:layout_centerInParent="true" 
android:gravity="center" /  
</RelativeLayout