Question

我的应用程序中有五个固定的GPS位置。当你靠近它们时，它将被存储在应用程序中并解锁某种奖牌。我已经在我的测验和奖牌中使用了SharedPreferences，但我对如何在SharedPreferences中存储GPS有点不确定。到目前为止，这是我的代码。

    package com.example.norskattraksjon;

    import java.util.ArrayList;

    import android.content.Context;
    import android.content.SharedPreferences;
    import android.location.Location;
    import android.location.LocationListener;
    import android.os.Bundle;

    import com.google.android.maps.GeoPoint;

    public class MyLocationListener implements LocationListener {
private ArrayList<GeoPoint> gplist;



public MyLocationListener(ArrayList<GeoPoint> gpList2) {
    gplist = gpList2;   
}



public void onLocationChanged(Location location) {
    System.out.println("Den kommer hits");
    for(GeoPoint gp : gplist){

        //SÂ henter vi ut latitude og longitude.
        //Det forvirrende her er at klassen "Location" bruker float-koordinater
        //mens "GeoPoint" bruker mikrokoordinater. Dermed mÂ man konvertere mellom de.
        float latitude = (float) (gp.getLatitudeE6() / 1E6);
        float longitude = (float) (gp.getLongitudeE6() / 1E6);

        //Vi lager en "location" for hvert av punktene i gplist, utifra latitude og longitude.
        Location test = new Location("tester");
        test.setLatitude(latitude); 
        test.setLongitude(longitude);

        //location.distanceTo() er en metode som sjekker avstanden til punkter.
        //Her skal distansen vÊre under 10 000 meter.
        if(location.distanceTo(test) <= 70){
            //Om distansen er under 10 000m, sÂ lager du en toast som gir den faktiske avstanden til punktet.
            System.out.println("Her er du");


            SharedPreferences prefs = getSharedPreferences("com.example.norskattraksjon",
                    Context.MODE_PRIVATE);

                    // Lagre en tekst... først trenger vi en editor                     
                SharedPreferences.Editor editor = prefs.edit();
                editor.putBoolean("location", true);

                   //Lagrer verdien
                    editor.commit();            

        };

    }






    };

private SharedPreferences getSharedPreferences(String string,
        int modePrivate) {
    // TODO Auto-generated method stub
    return null;
}

public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub
}

public void onProviderEnabled(String provider) {
    // TODO Auto-generated method stub
}

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

}

这是我的其他连贯代码;

    package com.example.norskattraksjon;

    import java.util.ArrayList;
    import java.util.List;

    import android.content.Context;
    import android.content.SharedPreferences;
    import android.graphics.drawable.Drawable;
    import android.location.LocationListener;
    import android.location.LocationManager;
    import android.os.Bundle;
    import android.view.Menu;

    import com.google.android.maps.GeoPoint;
    import com.google.android.maps.MapActivity;
    import com.google.android.maps.MapController;
    import com.google.android.maps.MapView;
    import com.google.android.maps.Overlay;
    import com.google.android.maps.OverlayItem;

    public class MainActivityMap extends MapActivity {

private MapController mc;
MapOverlays overlay;
ArrayList<GeoPoint> gplist;
List<Overlay> overlayList;
 LocationListener mlocListener; //Denne klassen lytter etter lokasjonen din
  LocationManager mlocManager; //Mens denne kobler deg opp mot telefonens GPS.

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    System.out.println("WEEEEEEE");
    setContentView(R.layout.mapview);


    MapView mapView = (MapView) findViewById(R.id.mapview);
    mapView.setBuiltInZoomControls(true);
    mapView.setSatellite(true);

    mc = mapView.getController();
    gplist = new ArrayList<GeoPoint>();


    overlayList = mapView.getOverlays();
    Drawable drawable = this.getResources().getDrawable(R.drawable.ic_launcher);
    overlay = new MapOverlays(drawable, this);
    double lat = 60.39403;
    double lon = 5.330579;

    GeoPoint point = new GeoPoint ((int) (lat * 1E6), (int) (lon*1E6));
    gplist.add(point);
    OverlayItem punkt1 = new OverlayItem(point, "Du har kommet til!", "Domkyrkja i Bergen!");

    double lat2 = 60.702251;
    double lon2 = 5.333685;

    GeoPoint point1 = new GeoPoint ((int) (lat2 * 1E6), (int) (lon2 *1E6));
    gplist.add(point1);
    OverlayItem punkt2 = new OverlayItem(point1, "Her ble", "Noen som drepte kongen begravd");

    double lat3 = 60.37829;
    double lon3 = 5.335665;

    GeoPoint point3 = new GeoPoint ((int) (lat3 * 1E6), (int) (lon3 *1E6));
    gplist.add(point3);
    OverlayItem punkt3 = new OverlayItem(point3, "Her ble", "Himmelfarten med tran i maga!");

    double lat4 = 60.213789;
    double lon4 = 5.369895;

    GeoPoint point4 = new GeoPoint ((int) (lat4 * 1E6), (int) (lon4 *1E6));
    gplist.add(point4);
    OverlayItem punkt4 = new OverlayItem(point4, "Her ble", "Flygelet skapt");

    double lat5 = 60.413619;
    double lon5 = 5.37579;

    GeoPoint point5 = new GeoPoint ((int) (lat5 * 1E6), (int) (lon5 *1E6));
    gplist.add(point5);
    OverlayItem punkt5 = new OverlayItem(point5, "Her ble", "Bergensbakken bakt");

    overlay.addOverlay(punkt1);
    overlay.addOverlay(punkt2);
    overlay.addOverlay(punkt3);
    overlay.addOverlay(punkt4);
    overlay.addOverlay(punkt5);
    overlayList.add(overlay);

    mc.animateTo(point);
    mc.setZoom(11);

    //Dette er metoden man bruker for Â koble opp til mobilens GPS
      mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

      //Her lager vi en instans av vÂr egen LocationListener. Dette gj¯r at vi kan bestemme selv hva som skjer
      //nÂr man trykker pÂ overlays.
      mlocListener = new MyLocationListener(gplist);

      //Her sier vi at vÂr LocationListener skal sp¯rre om GPS-signaler fra en GPS_PROVIDER.
      //0 stÂr for minimumstiden mellom oppdateringer
      //Den andre 0 stÂr for minimumsdistansen mellom oppdateringer
      //mLocListener er instansen vi lagde av vÂr egen LocationListener.
      mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
}

public GeoPoint newGeo(double x, double y){
    int a = (int) (x * 1E6);
    int b = (int) (y * 1E6);
    GeoPoint z = new GeoPoint(a,b);
    return z;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

@Override
protected boolean isRouteDisplayed() {
    // TODO Auto-generated method stub
    return false;
}
}

Answer 1

  SharedPreferences p = PreferenceManager.getDefaultSharedPreferences(context);
    int latE6 = (int) (lat * 1e6);
int lonE6 = (int) (lon * 1e6);
    p.edit().putInt("Lat", latE6).commit();
    p.edit().putInt("Long", lonE6).commit();

在上面的代码中，lat和lon是你所在位置的纬度和经度。那么你可以将它们作为int变量检索并通过再次将它们除以1e6来获取位置值。

 int lat= p.getInt("Lat", "");
int lon = p.getInt("Long", "");

Answer 2

您可以将Lat和Long直接存储在SharedPreference中，如下所示：

SharedPreferences p = PreferenceManager.getDefaultSharedPreferences(context);

p.edit().putString("Lat", YOUR_LATTITUDE).commit();
p.edit().putString("Long", YOUR_LONGITUDE).commit(); //SECURITY HAZARD: read below...

然后你可以像这样检索它：

String username = p.getString("Lat", "");
String password = p.getString("Long", "");

希望它会对你有所帮助。

Answer 3

制作一个这样的方法，只需将值作为参数传递。

private void SavePreferences(String key, String value){
    SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putString(key, value);
    editor.commit();
   }

你可以把它放进去。把它改成这个

private void SavePreferences(String key, long value)
editor.putInt(key,value)

如何在SharedPreferences Android中存储GPS位置

3 个答案: