“调用需要 API 级别 23"错误，但 API 1 的 FrameLayout 上存在 getForeground() [英] 'Call requires API level 23' error, but getForeground() exists on FrameLayout from API 1
问题描述
总结
最后，我发现了相关问题，setForeground() 在扩展 FrameLayout 的 ViewGroups 上被错误地标记为需要 API 23.
新问题
所以我的问题变成了如何使用以前版本中的方法，以及，为什么会选择性地出现检查错误?
如果我添加一个多余的演员，错误信息就会消失:
((FrameLayout) layout).getForeground()但是它正在访问现在不支持的 View 方法.
因此，我认为针对以前的 API 会删除错误消息，但我很感激使用此 Framelayout 方法的解决方案或解决我的问题的线索:
ANDROID_COMPILE_SDK_VERSION=23ANDROID_BUILD_TOOLS_VERSION=23.0.1ANDROID_DEFAULT_MIN_SDK_VERSION=19ANDROID_DEFAULT_TARGET_SDK_VERSION=23解决方法
简而言之，作为一种解决方法，我直接将类型更改为 FrameLayout，因此关于 API 和强制转换的警告消失了，我测试它在 Android 4.4.4 设备和调试上工作，我想它会崩溃，反正它只用在一个动画中，我将来会修复/替换它.
初始问题
我分叉并定制了 Google 示例
但是在旧版本检查中调用新方法显示需要API级别23的错误:
我发现了一个类似的问题，这是一个错误那种情况，但我认为这不是错误，因为原始 fork 没有显示此错误消息.
我会尝试检测消息第一次出现的时间，但我做了很多更改，因此我们不胜感激，谢谢.
最后我发现了相关问题，setForeground() 错误地标记为需要 API 23 for ViewGroups extends FrameLayout>.
问题 189041:setForeground() 被错误地标记为需要 API 23 (NewApi) 以用于 ViewGroups 扩展 FrameLayout
如果您没有扩展 FrameLayout，则文档是错误的，并且确实需要 API 23.
问题 186273:View.setForeground API 级别错误
Summary
Finally, I found the related issue, setForeground() incorrectly flagged as requiring API 23 on ViewGroups extending FrameLayout.
If you are not extending FrameLayout, the documentation is wrong and API 23 is required.
Issue 186273: View.setForeground wrong API level
Updated question
Marked as duplicated of Can't use setForeground method on ImageView by Commonsware and answered by him:
That is a documentation bug. setForeground() existed on FrameLayout from API Level 1; it is only on View as of API Level 23.
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.
But It's not the same case, this code is already extending a Framelayout and 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.
Update: I add a diff report for FrameLayout:
New question
So my question changes to how to use the method in previous versions, and, why does appear the inspection error selectively?
If I add a redundant cast, the error message disappears:
((FrameLayout) layout).getForeground()
But it's accessing the View method that is not supported now.
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:
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
In short, as a workaround, I changed the type to FrameLayout directly, 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.
Initial question
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 View in android.view package:
Call requires API level 23 (current min is 19): android.view.View#getForeground
The reference marks the method as added in API level 1, and the documentation (Control+Q) shows the same:
But the Calling new methods on older versions inspection shows an error that API level 23 is required:
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.
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.
Finally I found the related issue, setForeground() incorrectly flagged as requiring API 23 for ViewGroups extending FrameLayout.
If you are not extending FrameLayout, the documentation is wrong and API 23 is really required.
Issue 186273: View.setForeground wrong API level
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