利用LocationManager获取经度,纬度等地理信息完整示例

MainActivity如下:

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;@Overrideprotected 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@Overridepublic 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.@Overridepublic 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@Overridepublic void onProviderEnabled(String provider) {}//当provider被关闭的瞬间调用该方法.比如关闭打开GPS@Overridepublic 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);}@Overrideprotected void onDestroy() {super.onDestroy();if (mLocationManager!=null) {mLocationManager.removeUpdates(mLocationListenerImpl);}}}

main.xml如下:

<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>