有多少个ViewGroup（LinearLayout，Relative，Grid等）认为太多？ [英] How many ViewGroup (LinearLayout, Relative, Grid, etc..) considered too many?

问题描述

我试图找到针对此特定问题的答案，但没有。
我观看了一个视频

我意识到这些是列表视图中的行，并且已被回收，但是我的问题是，这通常被认为是不好的做法吗？

他们的视频讨论了linearlayout执行计算以在其中绘制元素的事实，当您嵌套多个linearlayouts时，情况会变得更糟。

解决方案

根据Lint检查：

布局视图太多

最大视图数默认为80，但可以使用环境变量ANDROID_LINT_MAX_VIEW_COUNT进行配置。

布局层次结构也是如此deep

嵌套过多的布局会降低
的性能。考虑使用更平坦的布局（例如
RelativeLayout或GridLayout）。默认最大深度为10，但可以使用环境变量ANDROID_LINT_MAX_DEPTH配置
。

根据我的经验：

如果您的应用支持api 9+，我建议嵌套视图少于12个。通常，这些设备对内存有限制。您可以获取OutOfMemoryException或StackOverflowException。当复合模式递归遍历层次结构时，就会发生StackOverflow。

I tried to find an answer for this specific question but I couldn't. I watched a video https://www.youtube.com/watch?v=NYtB6mlu7vA and I got the impression that over using Layouts generally is expensive. Apps like twitter, use complex designs that consists of many nested group views

I realize that these are rows inside a listview, and they are recycled, but my question is, is this considered bad practice generally?

The video they discussed the fact that linearlayout performs a calculation to draw elements inside it, and it gets worse when you nest multiple linearlayouts.

解决方案

According to Lint Checks:

Layout has too many views

The maximum view count defaults to 80 but can be configured with the environment variable ANDROID_LINT_MAX_VIEW_COUNT.

Layout hierarchy is too deep

Layouts with too much nesting is bad for performance. Consider using a flatter layout (such as RelativeLayout or GridLayout).The default maximum depth is 10 but can be configured with the environment variable ANDROID_LINT_MAX_DEPTH.

According to my experience:

If your app supports api 9+ I recommend having less than 12 nested views. Usually these devices have limitations on memory. You can get OutOfMemoryException or StackOverflowException. StackOverflow happens when "Composite" pattern recursively walks through hierarchy.

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