Question

请帮帮我，我正在开发一个带有mapView的Project Xyz，添加多个叠加层并根据userChoice删除叠加层。

更清楚的是，它根据用户选择,,,,

过滤叠加层

假设显示最喜欢的地方，用户的朋友......

PostLoginServiceHomeBean是我的ArrayList，带有ArrayList NearByFavoritePlacesList对象

entry.getNearByFavoritePlacesList（）。得到（ⅰ）.getGpsLatitude（） .trim（）

即通过这个我得到多个lat长格式服务器......

代码运行f9并将多个叠加层添加到我的地图中，并在叠加层上显示相应位置的名称和地址。但是如何从地图中删除叠加层...

我随附代码：请找到以下代码：

请帮帮我....

package com.gogozing.app;

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

import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.Toast;

import com.gogozing.service.LocateServices;
import com.gogozing.util.Data;
import com.gogozing.util.PostLoginServiceHomeBean;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
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 HomeMapActivity extends MapActivity {
    private MapView myMapView;
    private MapController myMapController;
    private List<Overlay> mapOverlays;
    private HomeMapItemizedOverlay itemizedOverlay;
    private Context context;
    private PostLoginServiceHomeBean entry;
    private GeoPoint initGeoPoint;
    private CheckBox peopleCheckBox, friendsCheckBox, favoritesCheckBox;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home_map_layout);
        context = this;
        backButton = (Button) findViewById(R.id.HomeMapLeftBackButton);
        eventsBtn = (Button) findViewById(R.id.EventsBtn);
        profileBtn = (Button) findViewById(R.id.ProflieBtn);
        homeBtn = (Button) findViewById(R.id.HomeBtn);
        locateButton = (Button) findViewById(R.id.LocateBtn);
        socializeButton = (Button) findViewById(R.id.SocializeBtn);
        peopleCheckBox = (CheckBox) findViewById(R.id.HomeMapViewPeopleCheckBox);
        favoritesCheckBox = (CheckBox) findViewById(R.id.HomeMapViewFavoritesCheckBox);
        friendsCheckBox = (CheckBox) findViewById(R.id.HomeMapViewFriendsCheckBox);


        homeBtn.setBackgroundResource(R.drawable.home_f);
        myMapView = (MapView) findViewById(R.id.mapviewHome);


        myMapView.setBuiltInZoomControls(true);
        // Set satellite view
        myMapController = myMapView.getController();

        // Get the current location in start-up
        try {

            entry = Data.postLoginServiceHomeMain.get(0);

            favoritesCheckBox
                    .setOnCheckedChangeListener(new OnCheckedChangeListener() {
                        public void onCheckedChanged(CompoundButton buttonView,
                                boolean isChecked) {
                            if (isChecked) {
                                viewFavoritePlaces();
                            } else
                                removeFavoritePlaces();

                        }
                    });

        } catch (Exception e) {
            Log.e(Data.LOG, e.getMessage(), e);
        }
    }

    void viewFavoritePlaces() {
        for (int i = 0; i < entry.getNearByFavoritePlacesList().size(); i++) {
            double latitude = Double.valueOf(
                    **entry.getNearByFavoritePlacesList().get(i).getGpsLatitude()
                            .trim()**).doubleValue();
            double longitude = Double.valueOf(
                    entry.getNearByFavoritePlacesList().get(i)
                            .getGpsLongitude().trim()).doubleValue();
            Log.v(Data.LOG1, " Latitude " + latitude + " Longitude "
                    + longitude);

            String name = entry.getNearByFavoritePlacesList().get(i)
                    .getMerchantName();
            String address = entry.getNearByFavoritePlacesList().get(i)
                    .getAddress();
            initGeoPoint = new GeoPoint((int) (latitude * 1E6),
                    (int) (longitude * 1E6));

            mapOverlays = myMapView.getOverlays();
            Drawable drawable = this.getResources().getDrawable(
                    R.drawable.map_store_place);

            itemizedOverlay = new HomeMapItemizedOverlay(drawable, this);
            OverlayItem overlayItem = new OverlayItem(initGeoPoint, name,
                    address);

            itemizedOverlay.addOverlay(overlayItem);

            mapOverlays.add(itemizedOverlay);
            myMapController.animateTo(initGeoPoint);
            myMapController.setZoom(15);
        }
    }
    void removeFavoritePlaces() {
        //List<Overlay> mapOverlays = myMapView.getOverlays();

        mapOverlays.remove(itemizedOverlay);

    }



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

    public class HomeMapItemizedOverlay extends ItemizedOverlay<OverlayItem> {
        private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
        private Context mContext;

        public HomeMapItemizedOverlay(Drawable defaultMarker, Context context) {
            super(boundCenterBottom(defaultMarker));
            mContext = context;
        }

        public void addOverlay(OverlayItem overlay) {
            mOverlays.add(overlay);
            populate();
        }
        public void removeOverlay(OverlayItem overlay)
        {
            mOverlays.remove(overlay);
            populate();
        }

        @Override
        protected OverlayItem createItem(int i) {
            return mOverlays.get(i);
        }

        @Override
        public int size() {
            return mOverlays.size();
        }

        @Override
        protected boolean onTap(int index) {
            OverlayItem item = mOverlays.get(index);
            AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
            dialog.setTitle(item.getTitle());
            dialog.setMessage(item.getSnippet());
            dialog.show();
            return true;
        }
    }

}

Answer 1

这里我给出了一个解决方案，我从你的问题中得到了...你需要将Lat Long添加到来自服务器的Overlay项目中并将其添加到逐项覆盖，之后你想要删除任何具有特定纬度的Itemized覆盖，您也可以检查并从地图覆盖中删除。

Android MapView

1 个答案: