无法将数据库纬度和经度与当前位置进行比较

Question

所以我试图获取当前的纬度和经度，并将其与我使用光标存储在数据库中的数据进行比较......但是当我尝试在我的手机上运行此应用程序时，它会在一段时间后关闭它。不知道为什么原因是什么.... 这是获取当前位置并将其与数据库

进行比较的代码

package com.example.alert;

import java.util.ArrayList;
import java.util.List;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.IBinder;
import android.widget.Toast;

public class service extends Service{

LocationManager lm;

DatabaseHelper db=new DatabaseHelper(this);
List<String> arlist=new ArrayList<String>();


@Override
public IBinder onBind(Intent arg0) {
    // TODO Auto-generated method stub
    return null;
}

public void onCreate() {
    LocationManager lm=(LocationManager)getSystemService(Context.LOCATION_SERVICE);

    LocationListener ll=new MyLocationListener();
    //lm.requestLocationUpdates( LocationManager.GPS_PROVIDER, 5*60*10000, 0, ll);
    lm.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, ll);

    Toast.makeText(this, "Background Service Created", Toast.LENGTH_LONG).show();



}

public void onDestroy() {
    Toast.makeText(this, "My Service Stopped", Toast.LENGTH_LONG).show();


}

public void onStart(Intent intent, int startid) {

    Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
//  Intent myIntent=new Intent(service.this,CurrentLocation.class);
    }





/* Class My Location Listener */
public class MyLocationListener implements LocationListener
{

    public void onLocationChanged(Location loc)
    {
        if(loc!=null)
        {
            double x;

            SQLiteDatabase y = db.getWritableDatabase();
            String Text = "My current location is: " +"Latitud = " + loc.getLatitude() +"Longitud = " + loc.getLongitude();
            Toast.makeText( getApplicationContext(),Text,Toast.LENGTH_SHORT).show();
        //  String t=loc.getLatitude().toString();
            Cursor cr=null;
            cr=y.rawQuery("SELECT LATITUDE FROM"+ "data",null);
            cr.moveToFirst();
            while(cr.moveToNext()) {

                arlist.add(cr.getString(cr.getColumnIndex("Latitude")));
                }
            for(int i=0;i<arlist.size();i++){
                if(arlist.get(i)==Double.toString(loc.getLatitude())){
                    Intent myIntent=new Intent(service.this,SilVib.class);
                    startActivity(myIntent);
                }
            }

            /*  cr.moveToFirst();
            while(!cr.isAfterLast()) {
                 al.add(cr.getString(cr.getColumnIndex(dbAdapter.KEY_NAME))); //add the item
                 cr.moveToNext();
            }*/
        //  lm.addProximityAlert(loc.getLatitude(), loc.getLongitude(), 10009,, intent)

            //for loop, alerters retrieving one by one
//      x= calcDistance(loc.getLatitude(),loc.getLongitude(),z,y);
    //      if(x<1){
        //        Intent myIntent = new Intent(ViewAlerters.this,CallMode.class);
          //        startActivity(myIntent);
            }

        }

    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub
        Toast.makeText( getApplicationContext(),"Gps Disabled - @From :Alert Me",Toast.LENGTH_SHORT ).show();


    }

    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub
        Toast.makeText( getApplicationContext(),"Gps Enabled - @From :Alert Me",Toast.LENGTH_SHORT).show();

    }

    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }
    }


/*  public double calcDistance(double latA, double longA, double latB, double longB) {

    double theDistance = (Math.sin(Math.toRadians(latA)) *  Math.sin(Math.toRadians(latB)) + Math.cos(Math.toRadians(latA)) * Math.cos(Math.toRadians(latB)) * Math.cos(Math.toRadians(longA - longB)));
    return new Double((Math.toDegrees(Math.acos(theDistance))) * 69.09*1.6093);
}
*/

}