[Based Android] Android uses criteria to select a suitable geographic location service.

1   /*  Locationactivity. Java
  2   * @ Author octobershiner
  3   * 2011 7 24
  4   * Se. Hit
  5   * Use criteria to select the optimal location service to demonstrate how to locate a user and listen for location changesCode
  6   *  */ 
 7  Package Uni. location;
 8  
 9   Import Android. App. activity;
 10   Import Android. content. context;
 11   Import Android. Location. criteria;
 12   Import Android. Location. location;
 13   Import Android. Location. locationlistener;
 14   Import Android. Location. locationmanager;
 15   Import Android. OS. Bundle;
 16   Import Android. OS. vibrator;
 17   Import Android. util. log;
 18   Import Android. widget. textview;
 19  
20   Public   Class Locationactivity Extends Activity {
 21       /**  Called when the activity is first created.  */ 
 22       //  Create an lcoationmanager object  
  23         Private Locationmanager manager;
 24       Private   Static   Final String tag = "location Demo ";
 25 @ Override
 26       Public   Void Oncreate (bundle savedinstancestate ){
 27           Super . Oncreate (savedinstancestate );
 28 Setcontentview (R. layout. Main );
29           //  Obtain system services,  
  30    Manager = (locationmanager) getsystemservice (context. location_service );
 31           //  Create a criteria object  
  32    Criteria = New Criteria ();
 33 Criteria. setaccuracy (criteria. accuracy_coarse );
 34           //  You do not need to obtain the altitude data.  
  35    Criteria. setaltituderequired ( False );
 36 Criteria. setbearingrequired ( False );
 37           //  Set the allowable fee  
 38    Criteria. setcostallowed ( True );
 39           //  Low Power Consumption  
  40    Criteria. setpowerrequirement (criteria. power_low );
 41 String provider = manager. getbestprovider (criteria, False );
 42 Log. I (TAG, "we choose" + provider );
 43 Location = manager. getlastknownlocation (provider );
 44           //  Obtain the device location for the first time  
  45    Updatelocation (location );
 46           //  Important functions, listening for Data Testing  
  47    Manager. requestlocationupdates (provider, 6000, 10,
48 Locationlistener );
 49                         
 50 }
 51      
 52       //  Create an event listener  
  53        Private   Final Locationlistener = New Locationlistener (){
54               Public   Void Onlocationchanged (location ){
 55 Updatelocation (location );
 56 }
 57               Public   Void Onproviderdisabled (string provider ){
 58 Updatelocation ( Null );
 59 Log. I (TAG, "provider now is disabled ..");
 60 }
 61               Public   Void Onproviderenabled (string provider ){
 62 Log. I (TAG, "provider now is enabled ..");
 63 }
 64               Public   Void Onstatuschanged (string provider, Int Status, bundle extras ){}
 65 };
 66      
 67   //  Obtain the user location function and use Log display.  
  68         Private   Void Updatelocation (location ){
 69 String latlng;
 70               If (Location! =Null ){
 71               Double Lat = location. getlatitude ();
 72               Double Lng = location. getlong.pdf ();
 73              
 74 Latlng = "latitude:" + lat + "longpolling:" + LNG;
 75 } Else {
 76 Latlng = "can't access your location ";
77 }
 78 Log. I (TAG, "the location has changed ..");
 79 Log. I (TAG, "Your location:" + latlng );
 80 }
 81      
 82 }

Modify the manifest. xml file at the same time

 1   <?  XML version = "1.0" encoding = "UTF-8"  ?>     
 2  <  Manifest  Xmlns: Android  = "Http://schemas.android.com/apk/res/android"  
  3   Package  = "Uni. Location"  
  4   Android: versioncode  = "1"  
  5   Android: versionname = "1.0"  >     
 6       <  Uses-SDK  Android: minsdkversion  = "8"     />     
 7      
 8       <  Application  Android: icon  = "@ Drawable/icon"  Android: Label = "@ String/app_name"  >     
 9           <  Activity  Android: Name  = ". Locationactivity"  
  10   Android: Label  = "@ String/app_name"  >     
 11               <  Intent-Filter >     
 12                   <  Action  Android: Name  = "Android. Intent. Action. Main"     />     
 13                   <  Category  Android: Name  = "Android. Intent. Category. launcher"     />     
14               </  Intent-Filter  >     
 15           </  Activity  >     
 16      
 17       </  Application  >     
 18           <  Uses-Permission Android: Name  = "Android. Permission. access_fine_location"     />      
 19   </  Manifest  >     

Demo result:

We can see that we only require low accuracy and the lowest power. From the last line, we can see that my VM network service is not enabled, but when we select the best provider, if the parameter is set to false, you can also select the parameter.