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ASyncTask でユーザーの位置を決定し、その後、マップ上の特定の位置にいくつかのマーカーを追加するマップ ビューがあります。場所が見つかった後、マップを更新できないようです。onPostExecute を実行する前に、場所が見つかるのを待つ方法はありますか。ASyncTask を使用せずに、MainMapView クラスに位置リスナーを含めてみました。これによりマップが更新されますが、マップが非常に遅くラグが発生します。これは、新しい場所が見つかるたびにマップが更新されるためだと思います。どんな助けでも大歓迎です。

import android.os.Bundle;
import android.os.AsyncTask;
import android.os.Looper;
import android.util.Log;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;

import java.io.IOException;
import java.util.List;
import java.util.Locale;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapController;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;


public class MainMapView extends MapActivity{

    private Location currentLocation;
    private String serviceName;
    private MapController mapController;
    private List<Overlay> mapOverlays;
    private ItemizedOverlay itemizedoverlay;
    private LocationManager locationManager;
    private HealthCarePractice[] practices;

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

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

        Bundle retItem = getIntent().getExtras();
        serviceName = retItem.getString("serviceName");
        //Log.e("This One", serviceName);

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

        mapOverlays = mapView.getOverlays();
        Drawable drawable = this.getResources().getDrawable(R.drawable.androidmarker);
        itemizedoverlay = new ItemizedOverlay(drawable, this);

        Context context = this;

        MainMapViewTask task = new MainMapViewTask();
        task.execute(context);

    }

    public class MainMapViewTask extends AsyncTask<Context, Integer, Void>
    {
        Context localContext;

        @Override
        protected Void doInBackground(Context... params) {
            localContext = params[0];
            // Aquire a reference to the system Location Manager
            locationManager = (LocationManager) localContext.getSystemService(Context.LOCATION_SERVICE);

            // Define a listener that responds to location updates
            LocationListener locationListener = new LocationListener() {
                public void onLocationChanged(Location location) {
                    // Called when a new location is found by the network location provider.
                    if (location != null)
                    {
                        currentLocation = location;
                        locationManager.removeUpdates(this);
                        locationManager = null;
                        Geocoder geocoder = new Geocoder(MainMapView.this, Locale.getDefault());  

                        List<Address> list;

                        if(currentLocation == null)
                        {
                            Log.e("Message", "Location not found");
                        }else{
                            try {
                                list = geocoder.getFromLocation(
                                currentLocation.getLatitude(), currentLocation.getLongitude(), 1);
                                if (list != null && list.size() > 0) {
                                    android.location.Address address = list.get(0);
                                    //Log.e("Post Code", address.getPostalCode());
                                    String poCode = address.getPostalCode();
                                    if (poCode != null)
                                    {
                                        //Log.e("Post Code", address.getPostalCode());
                                        String searchString = buildSearchString(serviceName, poCode.replaceAll(" ", ""));
                                        //Log.e("posplit", poCode.split(" ")[0]);
                                        Log.e("Search String", searchString);
                                        RemoteData remoteData = new RemoteData("Location", searchString);
                                        practices = remoteData.getPractices();
                                    }
                                }
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }

                }

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

                public void onProviderEnabled(String provider) {}

                public void onProviderDisabled(String provider) {}
              };

            Looper.myLooper();
            Looper.prepare();
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);

            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            if(currentLocation != null)
            {
                GeoPoint currentPoint = new GeoPoint((int)(currentLocation.getLatitude()*1000000), (int)(currentLocation.getLongitude()*1000000));
                mapController.setCenter(currentPoint);
                mapController.setZoom(15);
                for(int i=0; i< practices.length; i++)
                {
                    int latitude = (int)(practices[i].getLatitude()*1000000);
                    int longitude = (int)(practices[i].getLongitude()*1000000);
                    currentPoint = new GeoPoint(latitude, longitude);
                    mapController.setCenter(currentPoint);
                    mapController.setZoom(15);
                    String[] addressLines = practices[i].getAddress().getAddressLines();
                    StringBuilder sb = new StringBuilder();
                    for(int y=0; y<addressLines.length; y++)
                    {
                        sb.append(addressLines[y]);
                        sb.append('\n');
                    }
                    sb.append(practices[i].getAddress().getPostcode());
                    sb.append('\n');
                    sb.append("Telephone: ");
                    sb.append(practices[i].getTelephone());
                    OverlayItem currentOverlayItem = new OverlayItem(currentPoint,practices[i].getTitle(),sb.toString());
                    itemizedoverlay.addOverlay(currentOverlayItem);
                    mapOverlays.add(itemizedoverlay);
                }
            }
        }

    }
}

更新として、次のコードは機能しますが、マップは非常に遅く、ユーザーが新しい場所にドラッグしてマップを操作しようとすると遅延が発生します

import android.os.Bundle;
import android.os.AsyncTask;
import android.os.Looper;
import android.util.Log;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;

import java.io.IOException;
import java.util.List;
import java.util.Locale;


import android.content.Context;
import android.graphics.drawable.Drawable;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapController;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;


public class MainMapView extends MapActivity{

    private Location currentLocation;
    private String serviceName;
    private MapController mapController;
    private List<Overlay> mapOverlays;
    private ItemizedOverlay itemizedoverlay;
    private LocationManager locationManager;
    private HealthCarePractice[] practices;
    private boolean mapDrawn = false;

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

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

        Bundle retItem = getIntent().getExtras();
        serviceName = retItem.getString("serviceName");
        //Log.e("This One", serviceName);

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

        mapOverlays = mapView.getOverlays();
        Drawable drawable = this.getResources().getDrawable(R.drawable.androidmarker);
        itemizedoverlay = new ItemizedOverlay(drawable, this);

        Context context = this;

        /*
        MainMapViewTask task = new MainMapViewTask();
        task.execute(context);
        */

        locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

        // Define a listener that responds to location updates
        LocationListener locationListener = new LocationListener() {
            public void onLocationChanged(Location location) {
                // Called when a new location is found by the network location provider.
                if (location != null)
                {
                    currentLocation = location;
                    locationManager.removeUpdates(this);
                    locationManager = null;
                    Geocoder geocoder = new Geocoder(MainMapView.this, Locale.getDefault());  

                    List<Address> list;

                    if(currentLocation == null)
                    {
                        Log.e("Message", "Location not found");
                    }else{
                        try {
                            list = geocoder.getFromLocation(
                            currentLocation.getLatitude(), currentLocation.getLongitude(), 1);
                            if (list != null && list.size() > 0) {
                                android.location.Address address = list.get(0);
                                //Log.e("Post Code", address.getPostalCode());
                                String poCode = address.getPostalCode();
                                if (poCode != null)
                                {
                                    //Log.e("Post Code", address.getPostalCode());
                                    String searchString = buildSearchString(serviceName, poCode.replaceAll(" ", ""));
                                    //Log.e("posplit", poCode.split(" ")[0]);
                                    Log.e("Search String", searchString);
                                    RemoteData remoteData = new RemoteData("Location", searchString);
                                    practices = remoteData.getPractices();
                                    if(!mapDrawn)
                                    {
                                        mapDrawn = true;
                                        if(currentLocation != null)
                                        {
                                            GeoPoint currentPoint = new GeoPoint((int)(currentLocation.getLatitude()*1000000), (int)(currentLocation.getLongitude()*1000000));
                                            mapController.setCenter(currentPoint);
                                            mapController.setZoom(15);
                                            for(int i=0; i< practices.length; i++)
                                            {
                                                int latitude = (int)(practices[i].getLatitude()*1000000);
                                                int longitude = (int)(practices[i].getLongitude()*1000000);
                                                currentPoint = new GeoPoint(latitude, longitude);
                                                mapController.setCenter(currentPoint);
                                                mapController.setZoom(15);
                                                String[] addressLines = practices[i].getAddress().getAddressLines();
                                                StringBuilder sb = new StringBuilder();
                                                for(int y=0; y<addressLines.length; y++)
                                                {
                                                    sb.append(addressLines[y]);
                                                    sb.append('\n');
                                                }
                                                sb.append(practices[i].getAddress().getPostcode());
                                                sb.append('\n');
                                                sb.append("Telephone: ");
                                                sb.append(practices[i].getTelephone());
                                                OverlayItem currentOverlayItem = new OverlayItem(currentPoint,practices[i].getTitle(),sb.toString());
                                                itemizedoverlay.addOverlay(currentOverlayItem);
                                                mapOverlays.add(itemizedoverlay);
                                            }
                                        }
                                    }
                                }
                            }
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }

            }

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

            public void onProviderEnabled(String provider) {}

            public void onProviderDisabled(String provider) {}
          };

        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);

    }
4

1 に答える 1

0

マークごとに作成された影が原因でマップが遅れていることに気付きました。なぜこれが発生したのかはわかりませんが、OverlayItem クラスで次のコードを使用してマーカーの影を削除すると、問題が解決しました。

@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow)
{
    if(!shadow)
    {
        super.draw(canvas, mapView, false);
    }
}

マーカーの影がひどくずれていたことに注意する必要があります。誰かが正しい位置にある影を組み込むための解決策を持っている場合は、私に知らせてください. よろしくクッシュ

于 2012-05-25T23:45:24.420 に答える