在地图，Android，Google API上添加单个标记
在我的应用程序上，我从远程服务器接收坐标，我想在地图上的坐标上标记位置，这在onClick方法内部按需发生。问题是，当我更新位置时，我最终在地图上使用多个标记而不是一个，即当前位置。有没有办法在添加下一个标记之前删除前一个标记？
我按照本教程中的步骤操作：http：//developer.android.com/resources/tutorials/views/hello-mapview.html
我的代码是这样的：
public class AppTwoAndroid extends MapActivity {
private Button refreshButton;
double lat, lon;
ConnectionHandler conhandler;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MapView mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
Log.i("AppTwo", "making connectionhandler object");
conhandler = new ConnectionHandler();
conhandler.execute();
Log.i("AppTwo", "making button");
this.refreshButton = (Button)this.findViewById(R.id.close);
final List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.androidmarker);
final AppTwoAndroidItemizedOverlay itemizedoverlay = new AppTwoAndroidItemizedOverlay(drawable);
refreshButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.i("AppTwo", "inside onclick");
if (mapOverlays.contains(itemizedoverlay) == true) {
mapOverlays.remove(itemizedoverlay);
}
conhandler.write();
lat = conhandler.retLat();
lon = conhandler.retLon();
lat = lat * 1e6;
lon = lon * 1e6;
int ilat = (int) lat;
int ilon = (int) lon;
GeoPoint point = new GeoPoint(ilat ,ilon);
OverlayItem overlayitem = new OverlayItem(point, null, "AppOne");
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
Toast.makeText(getBaseContext(), "lat is: " + lat + " lon is: " + lon
, Toast.LENGTH_SHORT).show();
}
});
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
public class AppTwoAndroidItemizedOverlay extends ItemizedOverlay {
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
Context mContext;
public AppTwoAndroidItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
// TODO Auto-generated constructor stub
}
@Override
protected boolean onTap(int index) {
OverlayItem item = mOverlays.get(index);
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle(item.getTitle());
dialog.setMessage(item.getSnippet());
dialog.show();
return true;
}
public AppTwoAndroidItemizedOverlay(Drawable defaultMarker, Context context) {
super(defaultMarker);
mContext = context;
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
@Override
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}
@Override
public int size() {
return mOverlays.size();
}
}
没有找到相关结果
已邀请:
3 个回复
街茬
if (mapOverlays.contains(itemizedoverlay) == true) { mapOverlays.remove(itemizedoverlay); }徐百晴墓斜
碉罕城爸
mMap.clear(); LatLng latLng = new LatLng(gps.getLatitude(), gps.getLongitude()); mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng)); mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(gps.getLatitude(), gps.getLongitude()), 15)); mMap.addMarker(new MarkerOptions().position(latLng).title("")); mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);