Hes*_*sam 42 android google-maps google-maps-markers android-mapview
我的片段中有地图视图.我需要刷新地图并根据条件添加不同的标记.因此,我应该在添加新标记之前从地图中删除最后一个标记.
实际上,几周前应用程序工作正常,突然发生了.我的代码是这样的:
private void displayData(final List<Venue> venueList) {
// Removes all markers, overlays, and polylines from the map.
googleMap.clear();
.
.
.
}
上次它工作正常(在2013年I/O中由Android团队宣布新的Google Map API之前).但是,之后我调整了我的代码以使用这个新的API.现在,我不知道为什么这种方法googleMap.clear();不起作用!
任何建议将不胜感激.谢谢
=======
更新
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完整代码:
private void displayData(final List<Venue> venueList) {
// Removes all markers, overlays, and polylines from the map.
googleMap.clear();
// Zoom in, animating the camera.
googleMap.animateCamera(CameraUpdateFactory.zoomTo(ZOOM_LEVEL), 2000, null);
// Add marker of user's position
MarkerOptions userIndicator = new MarkerOptions()
.position(new LatLng(lat, lng))
.title("You are here")
.snippet("lat:" + lat + ", lng:" + lng);
googleMap.addMarker(userIndicator);
// Add marker of venue if there is any
if(venueList != null) {
for(int i=0; i < venueList.size(); i++) {
Venue venue = venueList.get(i);
String guys = venue.getMaleCount();
String girls= venue.getFemaleCount();
String checkinStatus = venue.getCan_checkin();
if(checkinStatus.equalsIgnoreCase("true"))
checkinStatus = "Checked In - ";
else
checkinStatus = "";
MarkerOptions markerOptions = new MarkerOptions()
.position(new LatLng(Double.parseDouble(venue.getLatitude()), Double.parseDouble(venue.getLongitude())))
.title(venue.getName())
.snippet(checkinStatus + "Guys:" + guys + " and Girls:" + girls)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_orange_pin));
googleMap.addMarker(markerOptions);
}
}
// Move the camera instantly to where lat and lng shows.
if(lat != 0 && lng != 0)
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lng), ZOOM_LEVEL));
googleMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
@Override
public View getInfoWindow(Marker marker) {
return null;
}
@Override
public View getInfoContents(Marker marker) {
return null;
}
});
googleMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
@Override
public void onInfoWindowClick(Marker marker) {
String str = marker.getId();
Log.i(TAG, "Marker id: " + str);
str = str.substring(1);
int markerId = Integer.parseInt(str);
markerId -= 1; // Because first item id of marker is 1 while list starts at 0
Log.i(TAG, "Marker id " + markerId + " clicked.");
// Ignore if User's marker clicked
if(markerId < 0)
return;
try {
Venue venue = venueList.get(markerId);
if(venue.getCan_checkin().equalsIgnoreCase("true")) {
Fragment fragment = VenueFragment.newInstance(venue);
if(fragment != null)
changeFragmentLister.OnReplaceFragment(fragment);
else
Log.e(TAG, "Error! venue shouldn't be null");
}
} catch(NumberFormatException e) {
e.printStackTrace();
} catch(IndexOutOfBoundsException e) {
e.printStackTrace();
}
}
});
Hes*_*sam 42
好吧,最后我找到了解决问题的替代方法.有趣的问题是当你为地图指定一个标记时,它的id是'm0'.当您从地图中删除它并指定新标记时,您希望id应为'm0',但它是'm1'.因此,它告诉我id不可信.所以我List<Marker> markerList = new ArrayList<Marker>();在onActivityCreated()片段的某处定义了.
然后使用以下代码更改上面的代码.如果他们与标记有类似的问题,希望它能帮助他人.
private void displayData(final List<Venue> venueList) {
Marker marker;
// Removes all markers, overlays, and polylines from the map.
googleMap.clear();
markerList.clear();
// Zoom in, animating the camera.
googleMap.animateCamera(CameraUpdateFactory.zoomTo(ZOOM_LEVEL), 2000, null);
// Add marker of user's position
MarkerOptions userIndicator = new MarkerOptions()
.position(new LatLng(lat, lng))
.title("You are here")
.snippet("lat:" + lat + ", lng:" + lng);
marker = googleMap.addMarker(userIndicator);
// Log.e(TAG, "Marker id '" + marker.getId() + "' added to list.");
markerList.add(marker);
// Add marker of venue if there is any
if(venueList != null) {
for (Venue venue : venueList) {
String guys = venue.getMaleCount();
String girls = venue.getFemaleCount();
String checkinStatus = venue.getCan_checkin();
if (checkinStatus.equalsIgnoreCase("true"))
checkinStatus = "Checked In - ";
else
checkinStatus = "";
MarkerOptions markerOptions = new MarkerOptions()
.position(new LatLng(Double.parseDouble(venue.getLatitude()), Double.parseDouble(venue.getLongitude())))
.title(venue.getName())
.snippet(checkinStatus + "Guys:" + guys + " and Girls:" + girls)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_orange_pin));
marker = googleMap.addMarker(markerOptions);
// Log.e(TAG, "Marker id '" + marker.getId() + "' added to list.");
markerList.add(marker);
}
}
// Move the camera instantly to where lat and lng shows.
if(lat != 0 && lng != 0)
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lng), ZOOM_LEVEL));
googleMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
@Override
public View getInfoWindow(Marker marker) {
return null;
}
@Override
public View getInfoContents(Marker marker) {
return null;
}
});
googleMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
@Override
public void onInfoWindowClick(Marker marker) {
int markerId = -1;
String str = marker.getId();
Log.i(TAG, "Marker id: " + str);
for(int i=0; i<markerList.size(); i++) {
markerId = i;
Marker m = markerList.get(i);
if(m.getId().equals(marker.getId()))
break;
}
markerId -= 1; // Because first item of markerList is user's marker
Log.i(TAG, "Marker id " + markerId + " clicked.");
// Ignore if User's marker clicked
if(markerId < 0)
return;
try {
Venue venue = venueList.get(markerId);
if(venue.getCan_checkin().equalsIgnoreCase("true")) {
Fragment fragment = VenueFragment.newInstance(venue);
if(fragment != null)
changeFragmentLister.OnReplaceFragment(fragment);
else
Log.e(TAG, "Error! venue shouldn't be null");
}
} catch(NumberFormatException e) {
e.printStackTrace();
} catch(IndexOutOfBoundsException e) {
e.printStackTrace();
} catch (NullPointerException e) {
e.printStackTrace();
}
}
});
}
小智 24
如果要清除"地图中的所有标记,叠加层和折线",请clear()在GoogleMap上使用.
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