Question

以下是这种情况。我试图创建仅在经度和纬度为1时才显示的标记。我还试图让LatLngBounds从一开始就在地图上的1个latlng标记内拟合标记。

我可以让一切工作但不能同时工作。我必须对我的If / Else语句做错。

protected void onPostExecute(Address address) {
        mMap.clear();
        if (address == null) {
            Toast.makeText(MainActivity.this, R.string.invalid_entry, Toast.LENGTH_LONG).show();
        } else {
            String addressName = "";
            for (int i = 0; i < address.getMaxAddressLineIndex(); i++) {
                addressName += " - " + address.getAddressLine(i);
            }

            Double longitude =  address.getLongitude();
            Double latitude =  address.getLatitude();

            LatLng position = new LatLng(address.getLatitude(), address.getLongitude());

            LatLngBounds.Builder builder = new LatLngBounds.Builder();
            builder.include(position);
            builder.include(position);

            //search location
            mMap.addMarker(new MarkerOptions().position(position).title(addressName)
                    .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE)));

            for (int i = 0; i < markers.size(); i++) {
                Double distanceLng = Math.abs(markers.get(i).longitude - longitude);
                Double distanceLat = Math.abs(markers.get(i).latitude - latitude);
                if ((distanceLng < 1) && (distanceLat < 1)) {
                    mMap.addMarker(new MarkerOptions()
                            .position(markers.get(i))
                            .title("Place")
                            .snippet("Description"));
                    builder.include(markers.get(i));
                    LatLngBounds bounds = builder.build();
                    int padding = 50; // offset from edges of the map in pixels
                    CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, padding);
                    Log.d(TAG, "DistanceBounds: " + bounds);
                    Log.d(TAG, "DistancePadding: " + padding);
                    Log.d(TAG, "DistanceI: " + i);
                    mMap.moveCamera(cu);
                }
                else {
                    Toast.makeText(MainActivity.this, R.string.no_places_in_area,Toast.LENGTH_LONG);
                    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 10));
                    Log.d(TAG, "DistanceLng Failed = " + distanceLng + "i = " + i);
                    Log.d(TAG, "DistanceLat Failed = " + distanceLat + "i = " + i);
                }
            }


        }

任何有关编写正确代码的帮助都将不胜感激！

Answer 1

您正在调用Math.abs（）方法，该方法返回给定数字的绝对值，即Math.abs（-10）将返回您的10.我建议您使用Math.floor或Math.ceil作为您的要求。

System.out.println(Math.ceil(25.46)); // Prints 26
System.out.println(Math.floor(25.46)); // Prints 25

这将为您提供确切的减去值。由于纬度和经度的值总是加倍，因此您可能无法根据您的要求获得1的确切值。

设置Google地图标记和分配边界 - Android

1 个答案: