Android定位&地图&导航——基于百度地图实现的定位功能

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

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：

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

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);  } } 

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);  } } 

<?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>