android 位置服务 api

1、位置服务分几种？

答：

粗略定位和精确定位；

粗略定位主要是基于移动网网络 wfif，精确定位基于GPS。

如何在Android中使用GPS功能？

答：核心类，LocationManager，Location和LocationProvider。

获取GPS定位信息的通用步骤？

答：

1、获取系统的LocationManager对象

2、使用LocationManager,指定LocationProvider来获取定位信息，定位信息由Location表示

3、从Location对象中获取定位信息

demo：

//位置管理器LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);//可以用的的LocationProvider的名字List<String> names = locationManager.getAllProviders();for (String name : names) {Log.i("LOCATION", name);System.out.println(names);}

注：这里不需要任何权限。

NETWORK_PROVIDER，网络定位，包括利用基站和Wifi信号的定位方式；
PASSIVE_PROVIDER，被动，就是被动地等待其他应用更新位置；
GPS_PROVIDER，GPS定位，最靠谱的一种

如何获得符合指定条件的LocationProvider？

答：Criteria（条件，标准）

//位置管理器LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);//创建一个LocationProvider的过滤条件Criteria criteria=new Criteria();criteria.setCostAllowed(true);//免费//criteria.setAltitudeRequired(true);//提供高度信息//criteria.setBearingRequired(true);//方向List<String> names=locationManager.getProviders(criteria, false);for (String name : names) {Log.i("LOCATION", name);}

如何获取定位信息？

答:

需要权限：

 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

java代码：

package com.example.gpsdemo;import android.content.Context;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v7.app.ActionBarActivity;import android.util.Log;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;public class MainActivity extends ActionBarActivity {Location location;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);if (savedInstanceState == null) {getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();}//位置管理器LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);location=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);//位置更新监听器locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 8,new LocationListener(){@Overridepublic void onLocationChanged(Location location) {// TODO Auto-generated method stubLog.i("LOCATION", location.getLatitude()+"-0");Log.i("LOCATION", location.getLongitude()+"-1");}@Overridepublic void onStatusChanged(String provider, int status,Bundle extras) {// TODO Auto-generated method stub}@Overridepublic void onProviderEnabled(String provider) {// TODO Auto-generated method stub}@Overridepublic void onProviderDisabled(String provider) {// TODO Auto-generated method stub}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}/** * A placeholder fragment containing a simple view. */public static class PlaceholderFragment extends Fragment {public PlaceholderFragment() {}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {View rootView = inflater.inflate(R.layout.fragment_main, container,false);return rootView;}}}