每次用户触摸屏幕时,我都会尝试添加新标记。 以下是我的代码,我的问题是新标记根本没有出现
package com.org;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;
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.MyLocationOverlay;
import com.google.android.maps.MapView.LayoutParams;
import com.google.android.maps.Overlay;
public class MapExampleActivity extends MapActivity {
MapView mapView;
MapController mc;
GeoPoint p;
MapOverlay mapOverlay = new MapOverlay();
private MyLocationOverlay myLocOverlay;
class MapOverlay extends com.google.android.maps.Overlay {
@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();
mapView.getProjection().toPixels(p, screenPts);
// ---add the marker---
Bitmap bmp = BitmapFactory.decodeResource(getResources(),
R.drawable.marker);
canvas.drawBitmap(bmp, screenPts.x + 25, screenPts.y - 50,null);
return true;
}
}
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView) findViewById(R.id.mymap);
LinearLayout zoomLayout = (LinearLayout)findViewById (R.id.myzoom);
View zoomView = mapView.getZoomControls();
zoomLayout.addView(zoomView,
new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
mapView.displayZoomControls(true);
mc = mapView.getController();
String coordinates[] = {"1.352566007", "103.78921587"};
double lat = Double.parseDouble(coordinates[0]);
double lng = Double.parseDouble(coordinates[1]);
p = new GeoPoint(
(int) (lat * 1E6),
(int) (lng * 1E6));
mc.animateTo(p);
mc.setZoom(17);
// ---Add a location marker---
MapOverlay mapOverlay = new MapOverlay();
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.clear();
listOfOverlays.add(mapOverlay);
mapView.invalidate();
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
public boolean onTouchEvent(MotionEvent event, MapView mapView)
{
//---when user lifts his finger---
if (event.getAction() == 1) {
GeoPoint p1 = mapView.getProjection().fromPixels(
(int) event.getX(),
(int) event.getY());
mc.animateTo(p1);
mc.setCenter(p1);
return true;
}
else
return false;
}
}
答案 0 :(得分:0)
试试这个。用这个替换你的覆盖onDraw()方法:
@Override
public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) {
super.draw(canvas, mapView, shadow);
Point screenPts = new Point();
mapView.getProjection().toPixels(p, screenPts);
for(int i=0;i<markerList.size();i++) {
canvas.drawBitmapbmp(markerList.get(i), screenPts.x + 25, screenPts.y - 50,null);
}
return false;
}
并将此方法添加到overlay类中,并在overlay类的顶部创建一个markerList。
public boolean onTap(GeoPoint p, MapView map) {
Point screenPts = new Point();
mapView.getProjection().toPixels(p, screenPts);
// ---add the marker---
Bitmap bmp = BitmapFactory.decodeResource(getResources(),R.drawable.marker);
markerList.add(bmp);
return true;
}