OverlayLevel (shell-vector-api API)

```
public class OverlayLevel
extends java.lang.Object
```
控制Overlay(Marker,Cirle,Polyline,Polygon)显示层级Level. Overlay显示层级控制中，Level优先，相同Level的Overlay，zIndex越大绘制越靠上层

Fields
Modifier and Type	Field and Description
`static int`	`OverlayLevelAboveBuildings` 在楼块之上POI之下
`static int`	`OverlayLevelAboveLabels` 显示在所有POI之上
`static int`	`OverlayLevelAboveRoads` 在道路之上楼块之下

Constructors
Constructor and Description
`OverlayLevel()`

Method Summary
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Class OverlayLevel