foreach remove 时出现并发修改异常

例如：

List overlays = mapView.getOverlays();
// for (Overlay overlay : overlays) {
// if (overlay instanceof MyLocationOverlay
// | overlay instanceof MyPoiOverlay) {
// } else {
// overlays.remove(overlay);
// }
// }   直接remove并发异常

可改为：

List overlays = mapView.getOverlays();
Overlay overlayToDel = null;
for (Overlay overlay : overlays) {
if (overlay instanceof MyLocationOverlay | overlay instanceof MyPoiOverlay) {

} else {
overlayToDel = overlay;
}
}
overlays.remove(overlayToDel);

或：

使用CopyOnWriteArrayList, CopyOnWriteArraySet实现,

 List list = new CopyOnWriteArrayList();
 list.add("Alpha");
 list.add("Beta");
 list.add("Cat");
 list.add("Dog");
 for (String s : list) {
     if (!"".equals(s)) {
         list.remove(s);
     }
 }