单击任意点时如何在谷歌地图中显示地址？

Question

我如何在地图应用程序中显示弹出消息，如这张图片http://imgur.com/FubOy

我制作了一个 gogle 地图应用程序，但没有显示任何地址这是我的代码我如何在单击该位置时显示任何点的地址消息，就像在这张图片中一样？？

 import java.util.List;

import android.graphics.drawable.Drawable;
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.Overlay;
import com.google.android.maps.OverlayItem;

public class AndroidGoogleMapsActivity extends MapActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // Displaying Zooming controls
    MapView mapView = (MapView) findViewById(R.id.mapView);
    mapView.setBuiltInZoomControls(true);

    /**
     * Changing Map Type
     * */
    // mapView.setSatellite(true); // Satellite View
    // mapView.setStreetView(true); // Street View
    // mapView.setTraffic(true); // Traffic view

    /**
     * showing location by Latitude and Longitude
     * */        
    MapController mc = mapView.getController();
    double lat = Double.parseDouble("48.85827758964043");
    double lon = Double.parseDouble("2.294543981552124");
    GeoPoint geoPoint = new GeoPoint((int)(lat * 1E6), (int)(lon * 1E6));
    mc.animateTo(geoPoint);
    mc.setZoom(15);
    mapView.invalidate(); 


    /**
     * Placing Marker
     * */
    List<Overlay> mapOverlays = mapView.getOverlays();
    Drawable drawable = this.getResources().getDrawable(R.drawable.mark_red);
    AddItemizedOverlay itemizedOverlay = 
         new AddItemizedOverlay(drawable, this);


    OverlayItem overlayitem = new OverlayItem(geoPoint, "Hello", "Sample Overlay  
  item");

    itemizedOverlay.addOverlay(overlayitem);
    mapOverlays.add(itemizedOverlay);

}

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


         import java.util.ArrayList;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.Toast;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;

public class AddItemizedOverlay extends ItemizedOverlay<OverlayItem> {

   private ArrayList<OverlayItem> mapOverlays = new ArrayList<OverlayItem>();

   private Context context;

   public AddItemizedOverlay(Drawable defaultMarker) {
        super(boundCenterBottom(defaultMarker));
   }

   public AddItemizedOverlay(Drawable defaultMarker, Context context) {
        this(defaultMarker);
        this.context = context;
   }

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

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

   @Override
   protected boolean onTap(int index) {
      Log.e("Tap", "Tap Performed");
      return true;
   }

   public void addOverlay(OverlayItem overlay) {
      mapOverlays.add(overlay);
       this.populate();
   }

   /**
    * Getting Latitude and Longitude on Touch event
    * **/
   @Override
   public boolean onTouchEvent(MotionEvent event, MapView mapView) 
   {   

       if (event.getAction() == 1) {                
           GeoPoint geopoint = mapView.getProjection().fromPixels(
               (int) event.getX(),
               (int) event.getY());
           // latitude
           double lat = geopoint.getLatitudeE6() / 1E6;
           // longitude
           double lon = geopoint.getLongitudeE6() / 1E6;
           Toast.makeText(context, "Lat: " + lat + ", Lon: "+lon,    
    Toast.LENGTH_SHORT).show();
       }                            
       return false;
   } 

}

Answer 1

package com.pocketjourney.view;

import java.util.ArrayList;

import com.hws.AmpleHarvest.MoreInformation;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Point;
import android.graphics.RectF;

import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.widget.Toast;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.hws.AmpleHarvest.AmpleHarvestActivity;
import com.hws.AmpleHarvest.PantryLocation;
import com.hws.AmpleHarvest.R;


public class MapLocationOverlay  extends Overlay  {

    private boolean isNameAddHold=true;

     private Bitmap bitmap,bitCross,bitMoreInformation;
    int testX,testY,count=0;
    int infoWindowOffsetX,infoWindowOffsetY;
    public String name,address,argName,argAddress,argid;
    //  Store these as global instances so we don't keep reloading every time
    private Bitmap bubbleIcon, shadowIcon;

    private MapLocationViewer mapLocationViewer;
    double toLat, toLng;

    private Paint   innerPaint, borderPaint, textPaint;
    private boolean isRemovePriorPopup=false;
    private boolean temp=true,first=true, firstDraw = true;
    public boolean tempDefaule=true;
    public MoreInformation myMoreInformation;
    public PantryLocation location;

    //  The currently selected Map Location...if any is selected.  This tracks whether an information  
    //  window should be displayed & where...i.e. whether a user 'clicked' on a known map location
    private PantryLocation selectedMapLocation;  

    public MapLocationOverlay(MapLocationViewer mapLocationViewer,PantryLocation arglocation) {

        this.mapLocationViewer = mapLocationViewer;
        location=arglocation;
        bubbleIcon = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.bubble);
        shadowIcon = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.shadow);
        bitmap = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.infowindow);
        bitCross = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.crass);
        bitMoreInformation = BitmapFactory.decodeResource(mapLocationViewer.getResources(),R.drawable.more_informations_new
                );

    }

    @Override
    public boolean onTouchEvent(MotionEvent e, MapView mapView) {
        // TODO Auto-generated method stub
         if (e.getAction() == 0)
         {
             this.tempDefaule=false;
         }
         if (e.getAction() == 1)
         {
             this.tempDefaule=false;
         }
         if (e.getAction() == 2)
         {
             this.tempDefaule=false;
         }
        return super.onTouchEvent(e, mapView);

    }







    @Override
    public boolean onTap(GeoPoint p, MapView    mapView)  {
        //this.tempDefaule=false;
        //  Store whether prior popup was displayed so we can call invalidate() & remove it if necessary.

        //  Next test whether a new popup should be displayed

            selectedMapLocation = getHitMapLocation(mapView,p);


            mapView.invalidate();

//      if (selectedMapLocation != null || isRemovePriorPopup==true) {
//          
//          mapView.invalidate();
//      }       

        //  Lastly return true if we handled this onTap()
        return selectedMapLocation != null;
    }

    @Override
    public void draw(Canvas canvas, MapView mapView, boolean shadow) {

        drawMapLocations(canvas, mapView, shadow);
        //this.tempDefaule=false;
        drawInfoWindow(canvas, mapView, shadow);
        //this.tempDefaule=false;
        }

    /**
     * Test whether an information balloon should be displayed or a prior balloon hidden.
     */
    private PantryLocation getHitMapLocation(MapView    mapView, GeoPoint   tapPoint) {

        //  Track which MapLocation was hit...if any
        PantryLocation hitMapLocation = null;

        RectF hitTestRecr = new RectF();
        Point screenCoords = new Point();
        ArrayList<PantryLocation> iterator =mapLocationViewer.getMapLocations();
        for(int i=0;i<iterator.size();i++) {       
            PantryLocation testLocation = iterator.get(i);

            //  Translate the MapLocation's lat/long coordinates to screen coordinates
            mapView.getProjection().toPixels(testLocation.getPoint(), screenCoords);

            // Create a 'hit' testing Rectangle w/size and coordinates of our icon
            // Set the 'hit' testing Rectangle with the size and coordinates of our on screen icon
            hitTestRecr.set(-bubbleIcon.getWidth()/2,-bubbleIcon.getHeight(),bubbleIcon.getWidth()/2,0);
            hitTestRecr.offset(screenCoords.x,screenCoords.y);

            //  Finally test for a match between our 'hit' Rectangle and the location clicked by the user
            mapView.getProjection().toPixels(tapPoint, screenCoords);
            //hitMapLocation = testLocation;
            if (hitTestRecr.contains(screenCoords.x,screenCoords.y)) {
                hitMapLocation = testLocation;
                first = true;
                isNameAddHold = true;
                break;
            }
        }
        testX=(int)screenCoords.x;
        testY=(int)screenCoords.y;
        //  Lastly clear the newMouseSelection as it has now been processed
        tapPoint = null;
        if(hitMapLocation==null && selectedMapLocation!=null)
        return selectedMapLocation; 

        return hitMapLocation;

    }

    private void drawMapLocations(Canvas canvas, MapView    mapView, boolean shadow) {
        int i=0;count++;
        ArrayList<PantryLocation> iterator =mapLocationViewer.getMapLocations();
        Point screenCoords = new Point();
        for(i=0;i<iterator.size();i++) {       
            PantryLocation location = iterator.get(i);
            mapView.getProjection().toPixels(location.getPoint(), screenCoords);
            //mapView.getController().setCenter(location.getPoint());
            if (shadow) {
                //  Only offset the shadow in the y-axis as the shadow is angled so the base is at x=0; 
                canvas.drawBitmap(shadowIcon, screenCoords.x, screenCoords.y - shadowIcon.getHeight(),null);
            } else {
                canvas.drawBitmap(bubbleIcon, screenCoords.x - bubbleIcon.getWidth()/2, screenCoords.y - bubbleIcon.getHeight(),null);
            }

        }
//      if(i==iterator.size()){
//          this.tempDefaule=false;}
if(tempDefaule==true)
{

            PantryLocation location1 = this.location;
            //mapView.getProjection().toPixels(location.getPoint(), screenCoords);
            Point screenCoord = new Point();
            mapView.getController().setCenter(location1.getPoint());
            mapView.getController().setZoom(15);
        //  tempDefaule=false;
                //mapView.getController().setCenter(location.getPoint());   

        }

            //tempDefaule=false;    
}           //mapView.getProjection().toPixels(location.getPoint(), screenCoord);
            //canvas.drawBitmap(bubbleIcon, screenCoord.x - bubbleIcon.getWidth()/2, screenCoord.y - bubbleIcon.getHeight(),null);
            //mapView.invalidate();


    private void drawInfoWindow(Canvas canvas, MapView  mapView, boolean shadow) {
        //this.tempDefaule=false;
        if ( selectedMapLocation != null) {
            if ( shadow) {
                //  Skip painting a shadow in this tutorial
            } else {
                //  First determine the screen coordinates of the selected MapLocation
                isRemovePriorPopup=true;
                Point selDestinationOffset = new Point();

//              if(first){
//                  //mapView.getController().setCenter(selectedMapLocation.getPoint());
//                  first = false;
//                  //mapView.getController().setZoom(15);
//              }
                mapView.getProjection().toPixels(selectedMapLocation.getPoint(), selDestinationOffset);

                //  Setup the info window with the right size & location
                int INFO_WINDOW_WIDTH = 125;
                int INFO_WINDOW_HEIGHT = 25;
                RectF infoWindowRect = new RectF(0,0,100,20);   
                RectF closeRect = new RectF(0,0,20,20); 
                 infoWindowOffsetX = selDestinationOffset.x-INFO_WINDOW_WIDTH/2;
                 infoWindowOffsetY = selDestinationOffset.y-INFO_WINDOW_HEIGHT-bubbleIcon.getHeight();
                 infoWindowRect.offset(infoWindowOffsetX+95,infoWindowOffsetY-45);
                 closeRect.offset(infoWindowOffsetX+160,infoWindowOffsetY-90);
//
//               int TEXT_OFFSET_X = 10;
//                  int TEXT_OFFSET_Y = 15;
//                  
                 Paint myPaintBlack=new Paint();
                    Paint myPaintWhite=new Paint();

                    myPaintWhite.setARGB(255, 255, 255, 255);


                //  Draw inner info window
                canvas.drawRoundRect(infoWindowRect, 5, 5, getInnerPaint());

                //  Draw border for info window
                canvas.drawRoundRect(infoWindowRect, 5, 5, getBorderPaint());

                //  Draw the MapLocation's name


                myPaintBlack.setColor(Color.BLACK);
                myPaintBlack.setTextSize(20);

//              canvas.drawText(selectedMapLocation.getAddress(),infoWindowOffsetX+TEXT_OFFSET_X,infoWindowOffsetY+TEXT_OFFSET_Y,getTextPaint());
                canvas.drawBitmap(bitmap, infoWindowOffsetX-50, infoWindowOffsetY-100,getInnerPaint());
                //canvas.drawBitmap(bitmap1, infoWindowOffsetX-45, infoWindowOffsetY-80,getInnerPaint());
                if(isNameAddHold)
                {
                argid=selectedMapLocation.getID();
                argName=selectedMapLocation.getName();
                name=selectedMapLocation.getName();
                toLat = selectedMapLocation.getLatitude();
                toLng = selectedMapLocation.getLongitude();
                if(name.length()>18)
                name=selectedMapLocation.getName().substring(0,18)+"..";
                argAddress=selectedMapLocation.getAddress();
                address=selectedMapLocation.getAddress();
                if(address.length()>30)
                address=selectedMapLocation.getAddress().substring(0,30)+"..";
                }
                canvas.drawText(name,infoWindowOffsetX-45,infoWindowOffsetY-70,myPaintBlack);
                myPaintBlack.setTextSize(13);
                canvas.drawText(address,infoWindowOffsetX-45,infoWindowOffsetY-55,myPaintBlack);

            //  Draw inner info window
                canvas.drawRoundRect(infoWindowRect, 5, 5, getInnerPaint());

                //  Draw border for info window
                canvas.drawRoundRect(infoWindowRect, 5, 5, getBorderPaint());

                //CloseRect
//              canvas.drawRoundRect(closeRect, 5, 5, getInnerPaint());
//              canvas.drawRoundRect(closeRect, 5, 5, getBorderPaint());

                //  Draw the MapLocation's name
                myPaintBlack.setColor(Color.CYAN);
                myPaintBlack.setTextSize(11);
                //canvas.drawText("Click for more info..",infoWindowOffsetX+105,infoWindowOffsetY-33,myPaintBlack);
                canvas.drawBitmap(bitMoreInformation, infoWindowOffsetX+95, infoWindowOffsetY-45,getInnerPaint());
                //canvas.drawBitmap(bitCross, infoWindowOffsetX+160, infoWindowOffsetY-90,getInnerPaint());

            }
        }
        if(isRemovePriorPopup)
        {
        if(((testX>(infoWindowOffsetX+95)&&testX<(infoWindowOffsetX+195)))&&(testY>(infoWindowOffsetY-45)&&testY<(infoWindowOffsetY-25)))
            {
            if(temp){
                try
                {
                    temp=false;
                    isNameAddHold=false;
                isRemovePriorPopup=false;
                Context context=mapLocationViewer.cn;
                Toast.makeText(context, "Loading...", Toast.LENGTH_SHORT).show();
                Intent intent=new Intent(context, MoreInformation.class);
                intent.putExtra("Id",argid);
                intent.putExtra("Name",argName);
                intent.putExtra("Address",argAddress);
                intent.putExtra("Latitude",toLat);
                intent.putExtra("Longitude",toLng);

                context.startActivity(intent);

                }
                catch (Exception ex)
                {
                    Log.d("Redirected Error :", ex.getMessage());
                }
        //canvas.drawText("This is for Testing",testX,testY,myPaintBlack);
            }}
            else if(((testX>(infoWindowOffsetX+160)&&testX<(infoWindowOffsetX+180)))&&(testY>(infoWindowOffsetY-90)&&testY<(infoWindowOffsetY-70)))
            {

                if(isRemovePriorPopup)
                {
                 isRemovePriorPopup=false;                  
                 selectedMapLocation=null;
                 draw(canvas, mapView, shadow);
                // mapLocationViewer.setDZoom();
                }

            }
        }
    }

    public Paint getInnerPaint() {
        if ( innerPaint == null) {
            innerPaint = new Paint();
            innerPaint.setARGB(225, 75, 75, 75); //gray
            innerPaint.setAntiAlias(true);
        }
        return innerPaint;
    }

    public Paint getBorderPaint() {
        if ( borderPaint == null) {
            borderPaint = new Paint();
            borderPaint.setARGB(255, 255, 255, 255);
            borderPaint.setAntiAlias(true);
            borderPaint.setStyle(Style.STROKE);
            borderPaint.setStrokeWidth(2);
        }
        return borderPaint;
    }

    public Paint getTextPaint() {
        if ( textPaint == null) {
            textPaint = new Paint();
            textPaint.setARGB(255, 255, 255, 255);
            textPaint.setAntiAlias(true);
        }
        return textPaint;
    }


}