Question

您好我只想知道如何通过单击菜单项来修改位置更新的频率我试过这个，但似乎我在这里做的不好（下面添加的代码），因为我没有在所选频率的位置更新。我只是想知道是否有可能改变频率，以及最好的实施方式。我希望能够刷新位置：通过单击子菜单项只能刷新一次，每秒或每2分钟。项目选择最终

任何人都可以告诉我，如果我正在做的事情是对的，并且不让我知道我该怎么办？提前致谢

以下是代码：

import android.os.Bundle;


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.OverlayItem;


import android.content.Intent;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

 public class MapLocator extends MapActivity implements LocationListener {
/** Called when the activity is first created. */


 private LocationManager lm;



@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.map);

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

    mc = mapView.getController();
    mc.setZoom(14);



    int FIVE_MINUTES = 5 /*Minutes*/ * 60 /*sec per min*/ * 1000 /*ms per sec*/;
    lm = (LocationManager) this.getSystemService(LOCATION_SERVICE);
    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,  FIVE_MINUTES, 0, this);


    Drawable drawable= this.getResources().getDrawable(R.drawable.loc_seven);
    ListItimizedOverlay itemizedoverlay = new ListItimizedOverlay(drawable);
    GeoPoint p = new GeoPoint(33000000,84000000);
    OverlayItem overlayitem = new OverlayItem(p, "Hello from", "Tahiti");
    itemizedoverlay.addOverlayItem(overlayitem);
    mapView.getOverlays().add(itemizedoverlay);

 }


 @Override
 protected boolean isRouteDisplayed()
 {
 return false;
 }

 @Override
 public boolean onKeyDown(int keyCode, KeyEvent event)
 {
     if (keyCode == KeyEvent.KEYCODE_S)
     {
         mapView.setSatellite(!mapView.isSatellite());
         return true;
     }
 return super.onKeyDown(keyCode, event);
 }

 @Override
 public void onLocationChanged(Location location)
 {
     Log.d("msg","1");

     lat = location.getLatitude();
     lng = location.getLongitude();

        Toast.makeText(
                getBaseContext(),
                "Location change to : Latitude = " + lat + " Longitude = "
                    + lng, Toast.LENGTH_SHORT).show();
     GeoPoint p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
     mc.animateTo(p);
     mc.setCenter(p);
     mc.setZoom(14);
     Drawable drawable= this.getResources().getDrawable(R.drawable.loc_seven);
     ListItimizedOverlay itemizedoverlay = new ListItimizedOverlay(drawable);
     OverlayItem overlayitem = new OverlayItem(p, "", "");
     itemizedoverlay=  (ListItimizedOverlay ) mapView.getOverlays().get(0);
     itemizedoverlay.clear();
     itemizedoverlay.addOverlayItem(overlayitem);
     mapView.getOverlays().add(itemizedoverlay);


 }

 @Override
 public void onProviderDisabled(String provider)
 {
     if(provider.equals("LocationManager.GPS_PROVIDER")){
         Toast.makeText(MapLocator.this, "GPS is off", Toast.LENGTH_LONG).show();

         startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
         }

     }

 @Override
 public void onProviderEnabled(String provider)
 {

    Log.v("main", "Enabled");
        Toast.makeText(MapLocator.this, "GPS Enabled", Toast.LENGTH_SHORT).show();
 }

 @Override
 public void onStatusChanged(String provider, int status, Bundle extras)
 {
 }

 @Override
 public void onPause() {
     super.onPause();
     lm.removeUpdates(this);
     }

  //Méthode qui se déclenchera lorsque vous appuierez sur le bouton menu du téléphone
    public boolean onCreateOptionsMenu(Menu menu2) {

        //Création d'un MenuInflater qui va permettre d'instancier un Menu XML en un objet Menu
        MenuInflater inflater = getMenuInflater();
        //Instanciation du menu XML spécifier en un objet Menu
        inflater.inflate(R.layout.menumap, menu2);

        return true;
     }


 public boolean onOptionsItemSelected(MenuItem item) {
         //On regarde quel item a été cliqué grâce à son id et on déclenche une action

          switch (item.getItemId()) {
            case R.id.refresh:
                return true;

            case R.id.refreshonce:

                 this.lm.requestSingleUpdate(LocationManager.GPS_PROVIDER, this, null);
                 Toast.makeText(MapLocator.this, "refreshnow", Toast.LENGTH_LONG).show();
                return true;

            case R.id.refresheachsec:

                this.lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,  0, 0, this);
                 Toast.makeText(MapLocator.this, "refresh2", Toast.LENGTH_LONG).show();
                return true;   

            case R.id.refresheach2min:

                this.lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,  2*60*1000, 0, this);
                 Toast.makeText(MapLocator.this, "refresh2", Toast.LENGTH_LONG).show();
                return true;        


            case R.id.refresheach5min:

                this.lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,  5*60*1000, 0, this);
                 Toast.makeText(MapLocator.this, "refresh5", Toast.LENGTH_LONG).show();
                return true;   

           case R.id.quitter:

               finish();
               return true;
         }

Answer 1

我建议在使用新时间请求更新之前使用LocationManager.removeUpdates()。另请注意，在JellyBean（4.1）中，更新之间的最短时间不再仅仅是一个提示。

请参阅：Location Manager in Android

“在Jellybean之前，minTime参数只是一个提示，并且一些位置提供程序实现忽略了它。从Jellybean开始，Android兼容设备必须同时观察minTime和minDistance参数。”

如何有可能在位置更新的频率（每秒，几分钟等）之间进行选择？

1 个答案: