基于Android实现百度地图定位过程详解

一、问题描述

lbs位置服务是android应用中重要的功能，应用越来越广泛，下面我们逐步学习和实现lbs相关的应用如定位、地图、导航等，首先我们看如何基于百度地图实现定位功能

二、配置环境

1、注册密钥：地址

2、下载定位sdk，并导入sdk如图所示：

 

三、编写myapplication类

编写myapplication类，为了使用方便我们可以将实现定位的方法封装的application组件中

封装下列方法

1、  获取定位信息——requestlocationinfo()

2、  通过广播发送位置信息——sendbroadcast()

3、  停止定位——stoplocationclient()

public class myapplication extends application{
  public locationclient mlocationclient = null;
  public geofenceclient mgeofenceclient;
  public mylocationlistenner mylistener = new mylocationlistenner();
  public static string tag = "myapplication";
  private static myapplication minstance = null;
  @override
  public void oncreate(){
    minstance = this;
    mlocationclient = new locationclient(this);
    /**
     * 项目的key，自己到官网申请 http://lbsyun.baidu.com/apiconsole/key
     */
    mlocationclient.setak("你的应用key");
    mlocationclient.registerlocationlistener(mylistener);
    mgeofenceclient = new geofenceclient(this);
    super.oncreate();
    log.d(tag, "... application oncreate... pid=" + process.mypid());
  }
  public static myapplication getinstance(){
    return minstance;
  }
  /**
   * 停止定位
   */
  public void stoplocationclient(){
    if (mlocationclient != null && mlocationclient.isstarted()){
      mlocationclient.stop();
    } 
  }
  /**
   * 发起定位
   */
  public void requestlocationinfo(){
    setlocationoption();
    if (mlocationclient != null && !mlocationclient.isstarted()){
      mlocationclient.start();
    }
    if (mlocationclient != null && mlocationclient.isstarted()){
      mlocationclient.requestlocation();
    } 
  }
  /**
   * 设置百度地图的相关参数
   */
  private void setlocationoption(){
    locationclientoption option = new locationclientoption();
    option.setopengps(true); // 打开gps
    option.setcoortype("bd09ll"); // 设置坐标类型
    option.setservicename("com.baidu.location.service_v2.9");
    option.setpoiextrainfo(true);
    option.setaddrtype("all");
    option.setpoinumber(10);
    option.disablecache(true);
    mlocationclient.setlocoption(option);
  }
  /**
   * 监听函数，有更新位置的时候，格式化成字符串，输出到屏幕中
   */
  public class mylocationlistenner implements bdlocationlistener
  {
    @override
    public void onreceivelocation(bdlocation location){
      if (location == null){
        sendbroadcast("定位失败!");
        return;
      }
      sendbroadcast(location.getaddrstr());
    }
    public void onreceivepoi(bdlocation poilocation){
      if (poilocation == null){
        sendbroadcast("定位失败!");
        return;
      }
      sendbroadcast(poilocation.getaddrstr());
    }
  }
  /**
   * 得到发送广播
   * @param address
   */
  public void sendbroadcast(string address){
        stoplocationclient();
    intent intent = new intent(mainactivity.location_bcr);
    intent.putextra("address", address);
    sendbroadcast(intent);
  }
}

三、 主程序mainactivity

public class mainactivity extends activity{
  public static string tag = "loctestdemo";
  private broadcastreceiver broadcastreceiver;
  public static string location_bcr = "location_bcr";
  private button locbtn;
  private textview locinfo;
  private myapplication application;
  @override
  protected void oncreate(bundle savedinstancestate){
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    application=(myapplication)super.getapplication();
    initialize();
    initializeviews();
    initializelisteners();
  }
  private void initialize(){
    registerbroadcastreceiver();//注册广播
  }
  private void initializeviews()
  {
    locbtn = (button) findviewbyid(r.id.location);
    locinfo = (textview) findviewbyid(r.id.location_info);
  }
  private void initializelisteners()
  {
    locbtn.setonclicklistener(new onclicklistener(){
      @override
      public void onclick(view v){
        locinfo.settext("定位中...");
      //调用请求定位信息
      application.requestlocationinfo();
      }
    });
  }
  /**
   * 注册一个广播，监听定位结果，接受广播获得地址信息
   */
  private void registerbroadcastreceiver()
  {
    broadcastreceiver = new broadcastreceiver(){
    public void onreceive(context context, intent intent){
      string address = intent.getstringextra("address");
        locinfo.settext(address);
      }
    };
    intentfilter intenttoreceivefilter = new intentfilter();
    intenttoreceivefilter.addaction(location_bcr);
    registerreceiver(broadcastreceiver, intenttoreceivefilter);
  }
  @override
  protected void ondestroy(){
    super.ondestroy();
    unregisterreceiver(broadcastreceiver);
  }
}

四、 androidmanifest.xml配置信息

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.jereh.baidulocation"
  android:versioncode="1"
  android:versionname="1.0" >
  <uses-sdk
    android:minsdkversion="8"
    android:targetsdkversion="17" />
  <application
    android:name="com.jereh.baidulocation.myapplication"
    android:allowbackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/apptheme" >
    <activity
      android:name="com.jereh.baidulocation.mainactivity"
      android:label="@string/app_name" >
      <intent-filter>
        <action android:name="android.intent.action.main" />
        <category android:name="android.intent.category.launcher" />
      </intent-filter>
    </activity>
    <service
      android:name="com.baidu.location.f"
      android:enabled="true"
      android:process=":remote" >
      <intent-filter>
        <action android:name="com.baidu.location.service_v2.2" >
        </action>
      </intent-filter>
    </service>
  </application>
  <uses-permission android:name="android.permission.access_coarse_location" >
  </uses-permission>
  <uses-permission android:name="android.permission.access_fine_location" >
  </uses-permission>
  <uses-permission android:name="android.permission.access_wifi_state" >
  </uses-permission>
  <uses-permission android:name="android.permission.access_network_state" >
  </uses-permission>
  <uses-permission android:name="android.permission.change_wifi_state" >
  </uses-permission>
  <uses-permission android:name="android.permission.read_phone_state" >
  </uses-permission>
  <uses-permission android:name="android.permission.write_external_storage" >
  </uses-permission>
  <uses-permission android:name="android.permission.internet" />
  <uses-permission android:name="android.permission.mount_unmount_filesystems" >
  </uses-permission>
  <uses-permission android:name="android.permission.read_logs" >
  </uses-permission>
  <uses-permission android:name="android.permission.vibrate" />
  <uses-permission android:name="android.permission.wake_lock" />
  <uses-permission android:name="android.permission.write_settings" />
</manifest>