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如何使用Android Maps Extensions进行足够的缩放以展开集群？

[英]How to zoom enough to unfold a cluster with Android Maps Extensions?

原文 2014-04-15 06:11:56 9 1 android/ google-maps/ android-maps-extensions

Sometimes when markers are really close to each other, it requires many clicks to zoom enough so that the cluster unfolds and shows all the markers individually. 有时，当标记确实彼此接近时，需要多次单击才能充分缩放，以使群集展开并单独显示所有标记。

How can I make it so that one click on a cluster always zooms in and unfolds it correctly? 如何使群集上的一键始终放大并正确展开？

1 个解决方案

If you wanted to zoom to show all the markers from a single cluster, you could end up showing only some of them. 如果要缩放以显示单个群集中的所有标记，则最终可能只显示其中一些标记。 If that's ok with you, here are the steps (eg in onMarkerClick ): 如果可以的话，请按以下步骤操作（例如，在onMarkerClick ）：

check if Marker.isCluster 检查Marker.isCluster
loop over Marker.getMarkers 遍历Marker.getMarkers
for every marker call GoogleMap.getMinZoomLevelNotClustered and remember the largest value from the loop 对于每个标记调用GoogleMap.getMinZoomLevelNotClustered并记住循环中的最大值
after loop call GoogleMap.animateCamera with some LatLng and the largest zoom value 循环后使用一些LatLng和最大的缩放值调用GoogleMap.animateCamera

The problem here is to decide what LatLng to choose. 这里的问题是决定选择哪种LatLng 。 If you choose the one from cluster marker, you could even end up not showing any marker after zoom. 如果从群集标记中选择一个，则放大后甚至可能不显示任何标记。

Alternatively you may want to zoom to LatLngBounds created from all the markers in the cluster. 或者，您可能需要缩放到从集群中所有标记创建的LatLngBounds 。 This will not make it to show all markers, but for sure you would end up with all markers still hidden somewhere on the screen. 这不会显示所有标记，但是可以肯定的是，最终所有标记仍将隐藏在屏幕上的某个位置。