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>