/**
 *Initialize positioning parameter configuration
 */

 private  void  initLocationOption ( )  {
 //Locate the client of the service. The host program declares this class on the client and calls it. Currently, it only supports starting in the main thread
 LocationClient locationClient =  new  LocationClient ( getApplicationContext ( ) ) ;
 //Declare LocationClient class instance and configure location parameters
 LocationClientOption locationOption =  new  LocationClientOption ( ) ;
 MyLocationListener myLocationListener =  new  MyLocationListener ( ) ;
 //Register listener function
 locationClient . registerLocationListener ( myLocationListener ) ; 
 //Optional, default high-precision, set positioning mode, high-precision, low-power, device only
 locationOption . setLocationMode ( LocationMode . Hight_Accuracy ) ; 
 //Optional, default gcj02, set the returned positioning result coordinate system. If it is used with Baidu Maps, it is recommended to set it to bd09ll;
 locationOption . setCoorType ( "gcj02" ) ;
 //Optional, the default is 0, that is, the location is only made once. It is valid to set the interval between successive location requests to be greater than or equal to 1000ms
 locationOption . setScanSpan ( one thousand ) ;
 //Optional. Set whether address information is required. It is not required by default
 locationOption . setIsNeedAddress ( true ) ;
 //Optional, set whether address description is required
 locationOption . setIsNeedLocationDescribe ( true ) ;
 //Optional, set whether the equipment direction result is required
 locationOption . setNeedDeviceDirect ( false ) ;
 //Optional, default false, set whether to output Gnss results at 1S1 frequency when Gnss is valid
 locationOption . setLocationNotify ( true ) ;
 //Optional. The default is true. Locate the SDK as a SERVICE and place it in an independent process. Set whether to kill the process at the time of stop. The default is not to kill the process
 locationOption . setIgnoreKillProcess ( true ) ; 
 //Optional, false by default, set whether to need location semantic results, which can be obtained in BDLocation.getLocationDescription, and the results are similar to "near Tiananmen Square in Beijing"
 locationOption . setIsNeedLocationDescribe ( true ) ;
 //Optional, false by default, set whether POI results are required, which can be obtained in BDLocation.getPoiList
 locationOption . setIsNeedLocationPoiList ( true ) ;
 //Optional, default false, set whether to collect CRASH information, default collection
 locationOption . SetIgnoreCacheException ( false ) ; 
 //Optional, default false, set whether to enable satellite positioning
 locationOption . setOpenGnss ( true ) ; 
 //Optional. The default is false. It is used to set whether altitude information is required during positioning. It is not required by default. Except for the basic positioning version, it is available
 locationOption . setIsNeedAltitude ( false ) ;
 //Set to turn on the automatic location callback mode. When this switch is turned on, as long as the location SDK detects a location change, it will actively call back to the developer. In this mode, the developer no longer needs to care about the location interval, but the location SDK itself will timely call back to the developer when it finds a location change
 locationOption . setOpenAutoNotifyMode ( ) ;
 //Set to turn on the automatic callback position mode. When this switch is turned on, as long as the positioning SDK detects a position change, it will actively call back to the developer
 locationOption . setOpenAutoNotifyMode ( three thousand , one ,  LocationClientOption . LOC_SENSITIVITY_HIGHT ) ; 
 //The configured LocationClientOption object needs to be passed to the LocationClient object through the setLocOption method for use
 locationClient . setLocOption ( locationOption ) ;
 //Start positioning
 locationClient . start ( ) ;
 }
 /**
 *Realize positioning callback
 */
 public  class  MyLocationListener  extends  BDAbstractLocationListener {
 @ Override
 public  void  onReceiveLocation ( BDLocation  location ) {
     //BDLocation here is the location result information class. All the results related to location can be obtained through its various get methods
     //The following is only a partial list of results related to longitude and latitude (commonly used)
     //For more result information, please refer to the description in BDLocation class in the class reference

     //Get latitude information
 double latitude =  location . getLatitude ( ) ;
     //Get longitude information
 double longitude =  location . getLongitude ( ) ;
     //Get the positioning precision, the default value is 0.0f
 float radius =  location . getRadius ( ) ;
     //Obtain the longitude and latitude coordinate type, which is subject to the coordinate type set in LocationClientOption
     String coorType =  location . getCoorType ( ) ;
     //Get the location type and location error return code. For specific information, refer to the description in BDLocation class in the class reference
 int errorCode =  location . getLocType ( ) ;
    
 }
 }

 //The core implementation code is as follows. For details, please refer to the official website Demo.
     //Start the foreground positioning service:
     Notification . Builder builder =  new  Notification . Builder  ( MainActivity . this . getApplicationContext ( ) ) ;
     //Get a Notification constructor

     Intent nfIntent =  new  Intent ( MainActivity . this . getApplicationContext ( ) ,  MainActivity . class ) ;
 builder . setContentIntent ( PendingIntent . getActivity ( MainActivity . this ,  zero , nfIntent ,  zero ) )  //Set PendingIntent
     . setContentTitle ( Background positioning in progress )  //Set the title in the drop-down list
     . setSmallIcon ( R . mipmap . ic_launcher )  //Set small icons in the status bar
     . setContentText ( "Background location notification" )  //Set context content
     . setAutoCancel ( true )
     . setWhen ( System . currentTimeMillis ( ) ) ;  //Set the time when this notification occurs
     Notification notification =  null ;
 notification = builder . build ( ) ;
 notification . defaults  =  Notification . DEFAULT_SOUND ;  //Set as default sound
 mLocClient . enableLocInForeground ( one thousand and one , notification ) ; //Turn up the foreground positioning
     //Stop the foreground location service:
 mLocClient . disableLocInForeground ( true ) ; //Close foreground positioning and remove the notice bar at the same time
    

 public  LocationClient mLocationClient =  null ;
     public  BDNotifyListener myListener =  new  MyNotifyListener ( ) ;
     /**
 *Please declare the LocationClient class object in the main thread. The initialization of this object needs to pass in the Context type parameter. It is recommended to use the getApplicationConext () method to obtain the valid Context of the whole process.
 */
     public  void  onCreate ( )  {
     //Declare LocationClient class
 mLocationClient =  new  LocationClient ( getApplicationContext ( ) ) ;     
     //Register listener function
 mLocationClient . registerNotify ( myListener ) ;    
     }
     /**
 *Define the MyNotifyLister class, inherit BDNotifyListener, and implement the callback of location listening.
 */
     public  class  MyNotifyLister  extends  BDNotifyListener  {
     public  void  onNotify ( BDLocation mlocation , float distance ) {
         //Reached near the set listening position
     }   		
     }
     //Call the setNotifyLocation method of BDNotifyListener to set the location message reminder.
     //Set position reminder. The four parameters are latitude, precision, radius and coordinate type
 myListener . setNotifyLocation ( forty . 0f ,  one hundred and sixteen . 0f ,  three thousand , mLocationClient . getLocOption ( ) . getCoorType ( ) ) ;
     //When positioning is enabled, the SDK will automatically enable the monitoring of location message alerts
 mLocationClient . start ( ) ;
     //Call the removeNotifyEvent method of BDNotifyListener to cancel location listening
 mLocationClient . removeNotifyEvent ( myListener ) ;