java “调用需要 API 级别 23”错误，但 API 1 的 FrameLayout 上存在 getForeground()
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'Call requires API level 23' error, but getForeground() exists on FrameLayout from API 1
提问by albodelu
Summary
概括
Finally, I found the related issue, setForeground()incorrectly flagged as requiring API 23 on ViewGroups extending FrameLayout.
最后，我发现了相关问题，setForeground()错误地标记为在 ViewGroups 扩展上需要 API 23 FrameLayout。
问题 189041：setForeground() 错误地标记为需要 API 23 (NewApi) 以用于扩展 FrameLayout 的 ViewGroups
If you are not extending FrameLayout, the documentation is wrong and API 23 is required.
如果您没有扩展FrameLayout，则文档是错误的并且需要 API 23。
Issue 186273: View.setForeground wrong API level
问题 186273：View.setForeground 错误的 API 级别
Updated question
更新的问题
Marked as duplicated of Can't use setForegroundmethod on ImageViewby Commonsware and answered by him:
被Commonsware标记为无法setForeground在ImageView上使用方法的重复并由他回答：
That is a documentation bug. setForeground() existed on FrameLayout from API Level 1; it is only on View as of API Level 23.
这是一个文档错误。setForeground() 存在于 API 级别 1 的 FrameLayout 上；它仅适用于 API 级别 23 的视图。
In my case the documentation bug is not detected by the inspection in the fork but does it in an integration project, I don't understand it, anyway, this answers my initial question.
在我的情况下，fork 中的检查未检测到文档错误，但在集成项目中检测到了文档错误，我不明白，无论如何，这回答了我最初的问题。
But It's not the same case, this code is already extending a Framelayoutand using this method, it's not an ImageView, so I suppose the method has been removed in API 23. It doesn't appear in the reference now.
但情况不一样，这段代码已经扩展了 aFramelayout并且使用了这个方法，它不是 an ImageView，所以我想这个方法已经在 API 23 中删除了。它现在没有出现在参考中。
Update:I add a diff reportfor FrameLayout:
更新：我为 FrameLayout添加了一个差异报告：
New question
新问题
So my question changes to how to use the method in previous versions, and, why does appear the inspection error selectively?
所以我的问题变成了如何使用以前版本中的方法，以及，为什么有选择地出现检查错误？
If I add a redundant cast, the error message disappears:
如果我添加一个多余的演员，错误信息就会消失：
((FrameLayout) layout).getForeground()
But it's accessing the Viewmethod that is not supported now.
但它正在访问View现在不支持的方法。
So I suppose targeting a previous API would remove the error message but I would appreciate a solution to use this Framelayout method or a clue to fix the issue in my case:
因此，我想针对以前的 API 会删除错误消息，但我会很感激使用此 Framelayout 方法的解决方案或解决我的问题的线索：
ANDROID_COMPILE_SDK_VERSION=23
ANDROID_BUILD_TOOLS_VERSION=23.0.1
ANDROID_DEFAULT_MIN_SDK_VERSION=19
ANDROID_DEFAULT_TARGET_SDK_VERSION=23
Workaround
解决方法
In short, as a workaround, I changed the type to FrameLayoutdirectly, so warnings about API and casting are gone, and I tested it works on Android 4.4.4 device and debugging, I thought it would crash, anyway it's only used in one animation, and I will fix/replace it in the future.
总之，作为一种解决方法，我将类型更改为FrameLayout直接，因此有关API和强制转换的警告消失了，我在Android 4.4.4设备和调试上测试了它的工作原理，我认为它会崩溃，反正它只在一个动画中使用，我会在未来修复/替换它。
Initial question
初始问题
I forked and customised the Google sample android-topeka, and android-studio shows an error that I don't understand about the API level required to use the method getForeground()of the class Viewin android.viewpackage:
我分叉和定制的谷歌样品Android的托皮卡，和android-Studio显示一个错误，我不明白有关API的级别要求使用方法getForeground()的类View在android.view包：
Call requires API level 23 (current min is 19): android.view.View#getForeground
调用需要 API 级别 23（当前最小值为 19）：android.view.View#getForeground
The referencemarks the method as added in API level 1, and the documentation (Control+Q) shows the same:
该参考将方法标记为在 API 级别 1 中添加，并且文档 ( Control+Q) 显示相同：
But the Calling new methods on older versions inspectionshows an error that API level 23 is required:
但是Calling new methods on older versions inspection显示需要 API 级别 23 的错误：
I found a similar question, a bug in that case, but I think this is not a bug due to the original fork doesn't show this error message.
我发现了一个类似的问题，在这种情况下是一个错误，但我认为这不是一个错误，因为原始 fork 没有显示此错误消息。
I'll try to detect the first time the message appears, but I did a lot of changes so any clue would be appreciated, thanks.
我会尝试检测消息第一次出现的时间，但我做了很多更改，因此我们将不胜感激，谢谢。
采纳答案by albodelu
Finally I found the related issue, setForeground()incorrectly flagged as requiring API 23 for ViewGroups extending FrameLayout.
最后我发现了相关的问题，setForeground()错误地标记为需要 API 23 来扩展FrameLayout.
问题 189041：setForeground() 错误地标记为需要 API 23 (NewApi) 以用于扩展 FrameLayout 的 ViewGroups
If you are not extending FrameLayout, the documentation is wrong and API 23 is really required.
如果您没有扩展FrameLayout，则文档是错误的，并且确实需要 API 23。
