Android Location based

Question

如果你想根據找到的位置在用戶手機上觸發（報警，通知等），所以我想知道需要使用哪種方法。 它像基於位置的報警。 請給我看一些例子，它會非常有幫助。

Answer 1

使用下面的代碼

import java.util.Timer; 
import java.util.TimerTask; 

import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.provider.Settings; 

import com.gs.mobile.Constants; 
import com.gs.mobile.R; 

public class MyLocation { 
    private Timer timer1; 
    private LocationManager lm; 
    private LocationResult locationResult; 
    private boolean gps_enabled=false; 
    private boolean network_enabled=false; 
    private AlertDialog.Builder dialog; 

    public boolean getLocation(final Context context, LocationResult result){ 
     //I use LocationResult callback class to pass location value from MyLocation to user code. 
     locationResult=result; 
     if(lm==null) 
      lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE); 

     //exceptions will be thrown if provider is not permitted. 
     try{gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){} 
     try{network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){} 

     //don't start listeners if no provider is enabled 
     if(!gps_enabled && !network_enabled){ 
      dialog = new AlertDialog.Builder(context); 
      dialog.setMessage(context.getResources().getString(R.string.gps_network_not_enabled)); 
      /*dialog.setPositiveButton(context.getResources().getString(R.string.open_location_settings), new DialogInterface.OnClickListener() { 

       @Override 
       public void onClick(DialogInterface paramDialogInterface, int paramInt) { 
        // TODO Auto-generated method stub 
        Intent myIntent = new Intent(Settings.ACTION_SECURITY_SETTINGS); 
        context.startActivity(myIntent); 
        Util.getGPS((Activity) context,locationResult); 
       } 
      }); 
      dialog.setNegativeButton(Constants.TEXT_CANCEL, new DialogInterface.OnClickListener() { 

       @Override 
       public void onClick(DialogInterface paramDialogInterface, int paramInt) { 
        // TODO Auto-generated method stub 

       } 
      });*/ 
      dialog.show(); 

     } 
     if(gps_enabled) 
      lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps); 
     if(network_enabled) 
      lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork); 
     timer1=new Timer(); 
     timer1.schedule(new GetLastLocation(), 20000); 
     return true; 
    } 

    LocationListener locationListenerGps = new LocationListener() { 
     public void onLocationChanged(Location location) { 
      timer1.cancel(); 
      locationResult.gotLocation(location); 
      lm.removeUpdates(this); 
      lm.removeUpdates(locationListenerNetwork); 
     } 
     public void onProviderDisabled(String provider) {} 
     public void onProviderEnabled(String provider) {} 
     public void onStatusChanged(String provider, int status, Bundle extras) {} 
    }; 

    LocationListener locationListenerNetwork = new LocationListener() { 
     public void onLocationChanged(Location location) { 
      timer1.cancel(); 
      locationResult.gotLocation(location); 
      lm.removeUpdates(this); 
      lm.removeUpdates(locationListenerGps); 
     } 
     public void onProviderDisabled(String provider) {} 
     public void onProviderEnabled(String provider) {} 
     public void onStatusChanged(String provider, int status, Bundle extras) {} 
    }; 

    class GetLastLocation extends TimerTask { 
     @Override 
     public void run() { 
      lm.removeUpdates(locationListenerGps); 
      lm.removeUpdates(locationListenerNetwork); 

      Location net_loc=null, gps_loc=null; 
      if(gps_enabled) 
       gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER); 
      if(network_enabled) 
       net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 

      //if there are both values use the latest one 
      if(gps_loc!=null && net_loc!=null){ 
       if(gps_loc.getTime()>net_loc.getTime()) 
        locationResult.gotLocation(gps_loc); 
       else 
        locationResult.gotLocation(net_loc); 
       return; 
      } 

      if(gps_loc!=null){ 
       locationResult.gotLocation(gps_loc); 
       return; 
      } 
      if(net_loc!=null){ 
       locationResult.gotLocation(net_loc); 
       return; 
      } 
      locationResult.gotLocation(null); 
     } 
    } 

    public static abstract class LocationResult{ 
     public abstract void gotLocation(Location location); 
    } 
}//MyLocation-class 

從活動中調用這個每次都是如下圖所示

/* Used to Get Device GPS Location 
    * <uses-permission android:name=�android.permission.ACCESS_FINE_LOCATION�> 
    */ 
    public static LocationResult locationResult = new LocationResult(){ 

     @Override 
     public void gotLocation(Location location) { 
      // TODO Auto-generated method stub 

     } 
    }; 

    public static void getGPS(Activity _activity){ 
     MyLocation myLocation = new MyLocation(); 
     myLocation.getLocation(_activity, locationResult); 

    }//getGPS() 

    public static void getGPS(Activity _activity,LocationResult locationResult){ 
     MyLocation myLocation = new MyLocation(); 
     myLocation.getLocation(_activity, locationResult); 

    }//getGPS() 

時lat和郎改變你的公共無效gotLocation（位置定位）方法會叫你在哪裏可以檢查位置是否在預期之下。

如果你願意，你甚至可以使用URL http://maps.googleapis.com/maps/api/geocode/xml?address=37.4188514,-122.0874526&sensor=true

，在那裏你可以通過發送該谷歌服務中獲得該緯度，郎鹹平的名字。