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>