Question

我试图在地图上绘制标记，这些标记将被移除并在调用updateMap（）时重绘，但是没有绘制一些标记。 Android Google Maps API v2是否会阻止绘图标记彼此太靠近？当它们随机生成并且日志显示正在解析正确的Lat / Lon坐标时绘制点没有问题，但如果它的坐标太靠近myMarker（阈值），它将不会绘制标记。其中我并不确切知道，但就应用而言，它太大了。

public void updateMap() {
    if (myMarker != null)
        myMarker.remove();
    for (Marker m : friendMarkers)
        m.remove();

    myLocation = new LatLng(((MainPageActivity) getActivity()).getLatitude(),
                            ((MainPageActivity) getActivity()).getLongitude());

    myMarker = map.addMarker(new MarkerOptions().position(  myLocation) // Marker is set at my location
                                                                        // Title of Marker is set to user-determined value
                                                .title( ((MainPageActivity) getActivity()).getUsername() + " : You Are Here").visible(true)
                                                .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));

    // DEBUG - To be commented/removed
    Toast.makeText( getActivity().getApplicationContext(),
                    "UPDATING MAP\nshowFriendList size: " + ((MainPageActivity) getActivity()).showFriendList.size(), Toast.LENGTH_SHORT)
            .show();

    Log.d("Drawing Friends on Map", "Number of Friends: " + ((MainPageActivity)getActivity()).showFriendList.size());
    Log.d("Drawing Friends on Map", "Number of Friends Total: " + ((MainPageActivity)getActivity()).allFriendList.size());


    double friendLat, friendLon;

    // Loop through currently selected Friends list (showFriendList)
    for (Friend friend : ((MainPageActivity) getActivity()).showFriendList) {


        // THe user is also in the showFriendList, but we don't need to draw them
        if (!friend.getID().equals(((MainPageActivity)getActivity()).userId)){


        // Random rng = new Random();
        // friendLat = ((rng.nextInt() % 180000000) - 90000000) / 1000000.0; // Range +/- 90.0
        // friendLon = ((rng.nextInt() % 360000000) - 180000000) / 1000000.0; // Range +/- 180.0

        friendLat = ((MainPageActivity)getActivity()).getFriendLatitudeFromAll(friend);
        friendLon = ((MainPageActivity)getActivity()).getFriendLongitudeFromAll(friend);
        //friendLocation = new LatLng(friendLat, friendLon);

            Bitmap bmp = ig.makeIcon(friend.getName());

            // Make a LatLng item with the appropriate location
            Log.e("Drawing Friends","Drawing Friend : "+friend.getName()+" at Lat: " + friendLat + " Lon: " + friendLon);

            Marker toAdd = map.addMarker(new MarkerOptions()
                .position(new LatLng(friendLat, friendLon))
                .title(friend.getName()).visible(true)
                //.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE))
                .icon(BitmapDescriptorFactory.fromBitmap(bmp))
                );

            friendMarkers.add(toAdd);

            Log.d("Drawing Friend on Map", "Friend: " + friend.getName() + " Location: Lat: " + friend.getLatitude() + " Lon: " + friend.getLongitude());
        }
    }

    // Disable map's buttons for external apps
    map.getUiSettings().setMapToolbarEnabled(false);
}

Answer 1

TL; DR：我是个白痴。如果您得到异常结果，请检查您在外部地图服务上获得的坐标。

在服务器上传/下载期间交换纬度和经度。跟踪方法回调到服务器下载步骤，产生了所有正确的（纵向）纬度/经度方法调用。查看日志会产生正确的纬度/经度值，但直到现在才将其插入地图服务中以检查它们是否准确。由于myLocation是在本地获得的，所以它的工作正常，以及0.0，0.0（或其他不正确的值），因为没有正确获取值。在正确的范围内生成随机值，因此它们也正确显示。

Android Google Maps API v2一些Markers没有显示

1 个答案: