我正在创建一个应用程序，我需要在地图上显示一些带有大头针的位置。当用户点击大头针时，它应该在地图上显示一个弹出对话框以显示有关该位置的一些信息。一切正常，但是当我放大/缩小地图弹出对话框移动很远/从/靠近销。
package com.wheelz.util;
import java.util.ArrayList;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;
import com.google.android.maps.Projection;
import com.wheelz.R;
import com.wheelz.fragment.CarHomeZoneFragment;
import com.wheelz.fragmentactivity.SearchFragmentActivity;
public class HoemZoneOverlay extends com.google.android.maps.ItemizedOverlay {
private static final String TAG ="MyOVerlayItem";
GeoPoint p;
MapView map;
private LinearLayout popUpLayout;
private ArrayList<OverlayItem> aList = null;
// CarHomeZoneFragment homeZoneFrag;
Paint circlePaint;
Paint circleBorder;
String CarName;
String OwnerName;
public HoemZoneOverlay(Drawable defaultMarker,MapView mView, GeoPoint point, String carname, String ownername) {
super(boundCenterBottom(defaultMarker));
// TODO Auto-generated constructor stub
//homeZoneFrag = carHomeZoneFragment;
this.map = mView;
this.p = point;
this.CarName = carname;
this.OwnerName = ownername;
aList = new ArrayList<OverlayItem>();
circlePaint = new Paint( Paint.ANTI_ALIAS_FLAG );
circlePaint.setARGB(51,62, 167, 171);
// circlePaint.setColor(new Color);
circlePaint.setStrokeCap(Paint.Cap.ROUND);
circlePaint.setAntiAlias(true);
circlePaint.setStyle(Paint.Style.FILL_AND_STROKE);
circlePaint.setDither(false);
circleBorder = new Paint();
circleBorder.setARGB(255, 62, 167, 171);
circleBorder.setStrokeWidth(2);
circleBorder.setStrokeCap(Paint.Cap.ROUND);
circleBorder.setAntiAlias(true);
circleBorder.setDither(false);
circleBorder.setStyle(Paint.Style.STROKE);
/* circleBorder = new Paint();
circleBorder.setARGB(0, 62, 167, 171);
circleBorder.setStrokeWidth(2);
circleBorder.setStyle(Paint.Style.STROKE);*/
}
@Override
protected OverlayItem createItem(int i) {
// TODO Auto-generated method stub
return aList.get(i);
}
@Override
public int size() {
// TODO Auto-generated method stub
return aList.size();
}
public void addOverlay(OverlayItem overlay){
aList.add(overlay);
populate();
}
public boolean onTap (final GeoPoint point, final MapView map){
boolean tapped = super.onTap(point, map);
if (tapped){
if( map.getChildCount() <= 0 )
showPopUp(p,map);
}
else{
hidePopUp();
}
return true;
}
//You must have this method, even if it doesn't visibly do anything
@Override
protected boolean onTap(int index) {
return true;
}
@Override
public boolean draw(Canvas canvas, MapView mapView,
boolean shadow, long when)
{
super.draw(canvas, mapView, shadow);
//---translate the GeoPoint to screen pixels---
/*Point screenPts = new Point();
p = aList.get(0).getPoint();
mapView.getProjection().toPixels(p, screenPts);*/
//--------------draw circle----------------------
Point pt = mapView.getProjection().toPixels(p,null);
float radius = mapView.getProjection().metersToEquatorPixels(200);
// float radius = (float) Math.pow(2, mapView.getZoomLevel() - 9);
/* if(radius < canvas.getHeight()/25){
radius = canvas.getHeight()/25;
}*/
// canvas.drawCircle(screenPts.x, screenPts.y, radius, circlePaint);
canvas.drawCircle(pt.x, pt.y, radius, circlePaint);
canvas.drawCircle(pt.x, pt.y, radius, circleBorder);
//---add the marker---
/* Bitmap bmp = BitmapFactory.decodeResource(
WheelzApplication.getInstance().getResources(), R.drawable.marker);
canvas.drawBitmap(bmp, screenPts.x, screenPts.y-bmp.getHeight(), null); */
super.draw(canvas,mapView,shadow);
return true;
}
/*public boolean onTouchEvent(MotionEvent event,MapView map){
//---when user lifts his finger---
if(event.getAction()==1){
if( homeZoneFrag.popUpLayout != null ){
homeZoneFrag.hidePopUp();
}
return true;
}
else
return false;
}*/
public void showPopUp( GeoPoint gp,MapView map ){
System.out.println("coming in showpopup#################################### :"+gp);
//GeoPoint gp= item.getPoint();
Point p= new Point();
Projection projection= map.getProjection();
p = projection.toPixels(gp, p);
p.y-=50;
GeoPoint g= projection.fromPixels(p.x, p.y);
popUpLayout = (LinearLayout) LayoutInflater.from(SearchFragmentActivity.mContext).inflate(R.layout.popup, null);
final MapView.LayoutParams lp2 = new MapView.LayoutParams(
MapView.LayoutParams.WRAP_CONTENT,
MapView.LayoutParams.WRAP_CONTENT,
g,
MapView.LayoutParams.BOTTOM_CENTER);
String Car_Owner_Name = (OwnerName+"'s "+CarName).toString();
TextView name = ( TextView )popUpLayout.findViewById(R.id.car_owner_name_homezone);
name.setText( Car_Owner_Name );
map.addView(popUpLayout,lp2);
map.postInvalidate();
map.getController().animateTo(gp);
}
public void hidePopUp() {
System.out.println("onclick listener hide popup");
if( map != null ){
map.removeView( popUpLayout );
map.invalidate();
}
}
public void cleanUp(){
if( map != null ){
popUpLayout = null;
map.removeAllViews();
}
//homeZoneFrag = null ;
circlePaint = null ;
circleBorder = null ;
CarName = null ;
OwnerName = null ;
}
}
任何人都可以告诉我，即使在放大/缩小地图后，我如何才能始终在图钉上方弹出对话框。
谢谢