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>

利用LocationManager获取经度,纬度等地理信息完整示例