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>