我的片段中有 map View 。我需要刷新 map 并根据情况添加不同的标记。因此,在添加新标记之前,我应该从 map 上删除最后一个标记。
实际上,几周前应用运行正常,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();
.
.
.
}
上次它运行良好(在Android小组在I/O 2013中宣布新的Google Map API之前)。但是,此后,我修改了代码以使用此新API。现在,我不知道为什么该方法
googleMap.clear();
不起作用!任何建议,将不胜感激。谢谢
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更新
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完整的代码:
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();
}
}
});
最佳答案
好吧,终于找到了替代方法来解决我的问题。有趣的问题是,当您将标记分配给 map 时,其ID为'm0'。当您将其从 map 中删除并分配新标记时,您希望ID为“m0”,但应为“m1”。因此,它表明我的ID是不可信任的。所以我在片段的List<Marker> markerList = new ArrayList<Marker>();
中的某个地方定义了onActivityCreated()
。
然后用下面的代码更改上面的代码。如果其他人对标记有类似的问题,希望对他们有帮助。
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();
}
}
});
}