У меня есть MapView в моем приложении, и я рисую несколько круговых оверлеев на этой карте.Все работает нормально, но когда я масштабирую карту, радиус наложения не меняется.Я пытался найти решение на форумах и в Google, но не смог найти подходящее для меня.У кого-нибудь есть идеи?
Вот мой код:
HelloGoogleMaps.java (основная деятельность)
package com.adam.maps;
import java.util.Iterator;
import java.util.List;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.AbsoluteLayout;
import android.widget.RelativeLayout;
import android.widget.Toast;
import android.widget.ZoomButtonsController.OnZoomListener;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
public class HelloGoogleMaps extends MapActivity {
//create new LocationManager
//and LocationListener objects
LocationManager lm;
LocationListener locationListener;
OnZoomListener listener;
//create a new MapView
//and MapController object
MapView mapView;
MapController mc;
RelativeLayout parent;
int num = 4;
//LoopRegion region[] = new LoopRegion[num];
//LoopRegion border[] = new LoopRegion[num];
float regionX[] = {(float) 42.91556645193364, (float) 42.9151598328247,
(float) 43.00110298764482, (float) 43.00054196511636};
float regionY[] = {(float) -78.87073255078127, (float) -78.8714594294243,
(float) -78.78354466454317, (float) -78.78226256863405};
int regionR[] = {100, 70, 150, 75};
GeoPoint regionC[] = new GeoPoint[num];
CustomOverlay overlay[] = new CustomOverlay[num];
CustomOverlay overlayLoc;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Toast.makeText(getBaseContext(),
"Welcome to 'sound clusters'" ,
Toast.LENGTH_LONG).show();
//---use the LocationManager class to obtain GPS locations---
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = new MyLocationListener();
lm.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
0,
0,
locationListener);
//set our mapViewer object to our "mapview" namespace in the xml layout file
//this allows us to set the zoom control "ON" in our view
mapView = (MapView) findViewById(R.id.mapview);
//this will enable zoom controls, and put it on the screen
mapView.setBuiltInZoomControls(true);
//--------------------------------------------------------//
parent = (RelativeLayout) findViewById(R.id.parent);
//-------this is part of creating an overlay icon-------------------------------
/*List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.icon);
CustomItemizedOverlay itemizedOverlay =
new CustomItemizedOverlay(drawable, this);*/
//------------------------------------------------------------------------------
// Create new Overlay
for (int i = 0; i < num; i++){
regionC[i] = new GeoPoint(
(int) (regionX[i] * 1E6),
(int) (regionY[i] * 1E6));
int newRadius = (int) feetToPixels(mapView.getZoomLevel(), regionR[i]);
overlay[i] = new CustomOverlay(regionC[i], newRadius);
mapView.getOverlays().add(overlay[i]);
}
//-------this is part of creating an overlay icon-------------------------------
/*OverlayItem overlayitem =
new OverlayItem(point, "Hello", "I'm in Athens, Greece!");
itemizedOverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedOverlay);*/
//------------------------------------------------------------------------------
mc = mapView.getController();
mc.setZoom(20);
mapView.setSatellite(true);
Toast.makeText(getBaseContext(),
"Zoom level: " + mapView.getZoomLevel(),
Toast.LENGTH_SHORT).show();
}
//not sure what this does, but Google says you need it----//
@Override
protected boolean isRouteDisplayed() {
return false;
}
//--------------------------------------------------------//
private class MyLocationListener implements LocationListener
{
//@Override
public void onLocationChanged(Location loc) {
if (loc != null) {
List overlays = mapView.getOverlays();
// first remove old overlay
if (overlays.size() > 0) {
for (Iterator iterator = overlays.iterator(); iterator
.hasNext();) {
iterator.next();
iterator.remove();
}
}
GeoPoint p = new GeoPoint(
(int) (loc.getLatitude() * 1E6),
(int) (loc.getLongitude() * 1E6));
overlayLoc = new CustomOverlay(p, 5);
mapView.getOverlays().add(overlayLoc);
for (int i = 0; i < num; i++){
mapView.getOverlays().add(overlay[i]);
}
//mc.animateTo(p);
//mc.setZoom(16);
mapView.invalidate();
}
}
//@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
//@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
//@Override
public void onStatusChanged(String provider, int status,
Bundle extras) {
// TODO Auto-generated method stub
}
}
//custom functions--------------------------------------------------------------------
private static final double equatorFeet = 131479920;
private double feetToPixels(int zoomLevel, int feet) {
double equatorPixels = 256;
for (int i = 1; i < zoomLevel; i++) {
equatorPixels = equatorPixels * 2;
}
double pixelPerFoot = equatorPixels / equatorFeet;
return feet * pixelPerFoot;
}
//------------------------------------------------------------------------------------
}
И класс Overlay CustomOverlay.java
package com.adam.maps;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.Projection;
public class CustomOverlay extends Overlay {
private GeoPoint geopoint;
private int rad;
public CustomOverlay(GeoPoint point, int radius) {
geopoint = point;
rad = radius;
}
@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
// Transform geo-position to Point on canvas
Projection projection = mapView.getProjection();
Point point = new Point();
//store the transformed geopoint into a point with pixel values
projection.toPixels(geopoint, point);
/*// text "My Location"
Paint text = new Paint();
text.setAntiAlias(true);
text.setColor(Color.BLUE);
text.setTextSize(12);
text.setTypeface(Typeface.MONOSPACE);*/
// the circle to mark the spot
Paint circlePaint = new Paint();
circlePaint.setAntiAlias(true);
//fill region
circlePaint.setColor(Color.RED);
circlePaint.setAlpha(90);
circlePaint.setStyle(Paint.Style.FILL);
canvas.drawCircle(point.x, point.y, rad, circlePaint);
//border region
circlePaint.setColor(Color.WHITE);
circlePaint.setAlpha(255);
circlePaint.setStyle(Paint.Style.STROKE);
circlePaint.setStrokeWidth(3);
canvas.drawCircle(point.x, point.y, rad, circlePaint);
/*canvas.drawText("My Location", point.x + 3 * CIRCLERADIUS, point.y + 3
* CIRCLERADIUS, text);*/
}
}
Заранее благодарим за помощь!