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http://developer.baidu.com/map/

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>