Android 深入研究LBS（基于位置的服务）

Android 深入研究LBS（基于位置的服务）
package com.example.lbs;

import android.location.Criteria;

import android.location.Location;

import android.location.LocationListener;

import android.location.LocationManager;

import android.os.Bundle;

import android.app.Activity;

import android.content.Context;

import android.view.Menu;

import android.widget.TextView;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

LocationManager lm;

String serviceName = Context.LOCATION_SERVICE;

lm = (LocationManager) getSystemService(serviceName);//获取系统的服务，

Criteria cri = new Criteria();//创建一个criteria对象

cri.setAccuracy(Criteria.ACCURACY_FINE);

cri.setAltitudeRequired(false);//设置不需要获取海拔方向数据

cri.setBearingRequired(false);

cri.setCostAllowed(true);//设置允许产生资费

cri.setPowerRequirement(Criteria.POWER_LOW);//要求低耗电

String provider = lm.getBestProvider(cri, true);

Location lo = lm.getLastKnownLocation(provider);

updateWithNewLocation(lo);//第一次获得设备的位置

final LocationListener ll = new LocationListener() {

@Override

public void onStatusChanged(String arg0, int arg1, Bundle arg2) {

// TODO Auto-generated method stub

}

@Override

public void onProviderEnabled(String arg0) {

// TODO Auto-generated method stub

}

@Override

public void onProviderDisabled(String arg0) {

// TODO Auto-generated method stub

updateWithNewLocation(null);

}

@Override

public void onLocationChanged(Location arg0) {

// TODO Auto-generated method stub

updateWithNewLocation(arg0);

}

};

lm.requestLocationUpdates(provider, 2000, 10, ll);//监听数据

}

private void updateWithNewLocation(Location location){

String latLongString;

TextView myLocationText;

myLocationText = (TextView) findViewById(R.id.myLocation);

if(location!=null){

double lat = location.getLatitude();

double lng = location.getLongitude();

latLongString = "纬度："+lat+"经度"+lng;

}else{

latLongString = "failed";

}

myLocationText.setText("当前坐标位置是："+latLongString);

}

@Override

public 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;

}

}

同时注意在manifest中添加<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
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