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......但是当我试图在我的单元格上运行这个应用程序时，它会在一段时间后强制关闭......不要'不知道为什么是什么原因......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);
}
*/
}