Как добавить текст над маркером на Картах Google?

Question

try 
    { 
      JSONArray jArray = new JSONArray(result); 
      for(int i=0;i<jArray.length();i++) 
      { 
        JSONObject json_data = jArray.getJSONObject(i);      
        //Retrieve data from db. lat & long = double/name = String 
        latMarker = json_data.getDouble("latitude"); 
        lonMarker = json_data.getDouble("longitude"); 
        nameMarker = json_data.getString("name"); 
        List<Overlay> mapOverlays = mapView.getOverlays(); 
        Drawable drawable = this.getResources().getDrawable(R.drawable.ic_launcher); 
        CustomItemizedOverlay itemizedOverlay = 
         new CustomItemizedOverlay(drawable, this); 

        markers = new GeoPoint (
          (int) (latMarker * 1E6), 
          (int) (lonMarker * 1E6)); 

        //Happens when a marker is clicked 
        OverlayItem overlayitem = new OverlayItem(markers, "Tapped", "Name: " + nameMarker); 
        itemizedOverlay.addOverlay(overlayitem); 
        mapOverlays.add(itemizedOverlay);   
      } 
    } 
    catch(JSONException e) 
    { 
      Log.e("log_tag", "Error parsing data. " + e.toString()); 
    }   
} 

Я сделал приложение для Android и интегрировал в него Карты Google. Я также добавил маркеры в местах, которые расположены вокруг моего города. И моя проблема в том, что я не знаю, как добавить текст над этими маркерами. Кто-нибудь может мне помочь?

Answer 1

package com.labs; 

import java.util.ArrayList; 

import android.graphics.Paint; 
import android.graphics.Point; 
import android.graphics.Rect; 
import android.graphics.RectF; 
import android.graphics.drawable.BitmapDrawable; 
import android.graphics.drawable.Drawable; 
import android.text.TextPaint; 

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 ResoucesOverlay extends ItemizedOverlay 
{ 

    public ResoucesOverlay(Drawable defaultMarker) 
    { 
     /*Calling boundCenterBottom() on defaultMarker makes the marker image connect 
      at its Bottom center to the latitude and longitude of this Overlay Item*/ 
     super(boundCenterBottom(defaultMarker)); 

     markerHeight = ((BitmapDrawable) defaultMarker).getBitmap().getHeight(); 

     /* This call to populate is important. Although this does not appear in the MapView tutorial 
     * on Google's Android developer site, the mapview some times crashes without this call. 
     */ 
     populate(); 
    } 

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

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

    @Override 
    public void draw(android.graphics.Canvas canvas, MapView mapView, 
      boolean shadow) 
    { 
     super.draw(canvas, mapView, shadow); 

     // go through all OverlayItems and draw title for each of them 
     for (OverlayItem item:mOverlays) 
     { 
      /* Converts latitude & longitude of this overlay item to coordinates on screen. 
      * As we have called boundCenterBottom() in constructor, so these coordinates 
      * will be of the bottom center position of the displayed marker. 
      */ 
      GeoPoint point = item.getPoint(); 
      Point markerBottomCenterCoords = new Point(); 
      mapView.getProjection().toPixels(point, markerBottomCenterCoords); 

      /* Find the width and height of the title*/ 
      TextPaint paintText = new TextPaint(); 
      Paint paintRect = new Paint(); 

      Rect rect = new Rect(); 
      paintText.setTextSize(FONT_SIZE); 
      paintText.getTextBounds(item.getTitle(), 0, item.getTitle().length(), rect); 

      rect.inset(-TITLE_MARGIN, -TITLE_MARGIN); 
      rect.offsetTo(markerBottomCenterCoords.x - rect.width()/2, markerBottomCenterCoords.y - markerHeight - rect.height()); 

      paintText.setTextAlign(Paint.Align.CENTER); 
      paintText.setTextSize(FONT_SIZE); 
      paintText.setARGB(255, 255, 255, 255); 
      paintRect.setARGB(130, 0, 0, 0); 

      canvas.drawRoundRect(new RectF(rect), 2, 2, paintRect); 
      canvas.drawText(item.getTitle(), rect.left + rect.width()/2, 
        rect.bottom - TITLE_MARGIN, paintText); 
     } 
    } 

    public void addOverlay(int latitude, int longitude, String title, 
      String snippet) 
    { 
     OverlayItem item; 

     GeoPoint geopoint = new GeoPoint(latitude, longitude); 
     item = new OverlayItem(geopoint, title, snippet); 
     mOverlays.add(item); 
     populate(); 

    } 

    public void addOverlay(OverlayItem overlayItem) 
    { 
     mOverlays.add(overlayItem); 
     populate(); 
    } 

    private int markerHeight; 
    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); 

    private static final int FONT_SIZE = 12; 
    private static final int TITLE_MARGIN = 3; 
}