Changing to 10000 symbols after zooming in BulkSymbolActivity.java exits activity

Background

The BulkSymbolActivity.java is quite performant on all zoom levels for the 10, 100, 500, and 1000 symbol quantity options provided in the dropdown. The 10000 option also works performantly in some cases, but causes the activity to exit after certain zoom interactions. A couple of different scenarios to reproduce the problematic behavior are presented below.

Steps to reproduce

Switching to 10000 symbols when zoomed in

Select any symbol quantity other than 10000, and then zoom into the map. Then, select 10000 from the dropdown, and the activity will exit back to the Annotation plugin list view screen.

Zooming out when using 10000 symbols

If the 10000 option is selected from the dropdown before zooming in, the symbols render after a few seconds. The map can then be zoomed in successfully with only a small amount of lag. However, attempting to zoom back out causes the activity to exit back to the Annotation plugin list view screen.

Although 10000 symbols in a geographic area as condensed as Washington DC is likely not a very common use case, the issue is worth addressing given that the behavior is not currently well-documented or explained. I could not find any log messages that explained the behavior, so even being able to better understand the exiting behavior would be a step in the right direction.

从 BulkSymbolActivity.java 开始，重现报告的两种场景：在放大时切换到 10000 个符号，以及在选中 10000 个符号时缩小。跟踪 activity 退出的原因，并确定所有可用的诊断信息；当有问题的交互不再意外返回 Annotation 插件列表，或者在无法阻止该行为时对其进行了明确记录，即视为完成。