weibosrc/com/weibo/map/MapOverlay.java

   1 package com.weibo.map;
   2
   3 import java.io.IOException;
   4 import java.util.List;
   5 import java.util.Locale;
   6
   7 import android.content.Context;
   8 import android.graphics.Bitmap;
   9 import android.graphics.BitmapFactory;
  10 import android.graphics.Canvas;
  11 import android.graphics.Paint;
  12 import android.graphics.Point;
  13 import android.location.Address;
  14 import android.location.Geocoder;
  15 import android.view.MotionEvent;
  16 import android.widget.Toast;
  17
  18 import com.google.android.maps.GeoPoint;
  19 import com.google.android.maps.MapView;
  20 import com.google.android.maps.Overlay;
  21 import com.weibo.sina.R;
  22
  23 public class MapOverlay extends Overlay {
  24         private Context mContext;
  25         private GeoPoint mGeoPoint;
  26         public MapOverlay(Context context) {
  27                 super();
  28                 mContext = context;
  29         }
  30
  31         @Override
  32         public boolean onTouchEvent(MotionEvent event, MapView mapView) {
  33                 // ---when user lifts his finger---
  34                  if (event.getAction() == 1) {
  35              GeoPoint p = mapView.getProjection().fromPixels(
  36                  (int) event.getX(),
  37                  (int) event.getY());
  38
  39              Geocoder geoCoder = new Geocoder(
  40                  mContext, Locale.getDefault());
  41              try {
  42                  List<Address> addresses = geoCoder.getFromLocation(
  43                      p.getLatitudeE6()  / 1E6,
  44                      p.getLongitudeE6() / 1E6, 1);
  45
  46                  String add = "";
  47                  if (addresses.size() > 0)
  48                  {
  49                      for (int i=0; i<addresses.get(0).getMaxAddressLineIndex();
  50                           i++)
  51                         add += addresses.get(0).getAddressLine(i) + "\n";
  52                  }
  53
  54                  Toast.makeText(mContext, add, Toast.LENGTH_SHORT).show();
  55              }
  56              catch (IOException e) {
  57                  e.printStackTrace();
  58              }
  59              return true;
  60          }
  61          else
  62              return false;
  63         }
  64
  65          @Override
  66      public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when)
  67      {
  68          super.draw(canvas, mapView, shadow);
  69          Paint paint = new Paint();
  70          Point myScreenCoords = new Point();
  71          // 将经纬度转换成实际屏幕坐标
  72          mapView.getProjection().toPixels(mGeoPoint, myScreenCoords);
  73          paint.setStrokeWidth(1);
  74          paint.setARGB(255, 255, 0, 0);
  75          paint.setStyle(Paint.Style.STROKE);
  76          Bitmap bmp = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.ic_location_pin);
  77          canvas.drawBitmap(bmp, myScreenCoords.x, myScreenCoords.y, paint);
  78          canvas.drawText("中通福瑞", myScreenCoords.x, myScreenCoords.y, paint);
  79          return true;
  80      }
  81
  82         public GeoPoint getGeoPoint() {
  83                 return mGeoPoint;
  84         }
  85
  86         public void setGeoPoint(GeoPoint mGeoPoint) {
  87                 this.mGeoPoint = mGeoPoint;
  88         }
  89
  90
  91
  92 }