ViewPager一个页面中包含多个片段＆QUOT; java.lang.IllegalArgumentException：如果没有查看发现ID＆QUOT; [英] ViewPager with one page containing multiple Fragments "java.lang.IllegalArgumentException: No view found for id"

问题描述

在我小的Andr​​oid应用程序，我有一个 ViewPager 3个页面，每个页面包含一个片段，这是所有工作的罚款与 FragmentStatePagerAdapter （见前面的问题）。

In my small Android app, I have a ViewPager with 3 pages, each page contains one fragment, that's all working fine with a FragmentStatePagerAdapter (see earlier question).

现在的大屏幕，我想保持一个 ViewPager ，但我想前两个片段是相同的第一页。

Now for larger screens, I would like to keep a ViewPager, but I want the first two fragments to be on the same first page.

对于这一点，我实现自己的PagerAdapter，这主要是工作，我试图解决的唯一问题是，当我旋转屏幕，我得到一个错误：

For this, I implement my own PagerAdapter and this is mostly working, the only problem I am trying to resolve is when I am rotating the screen, I get an error:

12-11 16:34:13.526: ERROR/AndroidRuntime(9221): FATAL EXCEPTION: main
        java.lang.RuntimeException: Unable to start activity ComponentInfo{com.matthieu/com.matthieu.TestActivity}: java.lang.IllegalArgumentException: No view found for id 0x7f030002 (com.matthieu:id/top_fragment) for fragment TestFragment{481a3a98 #0 id=0x7f030002}
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3815)
        at android.app.ActivityThread.access$2400(ActivityThread.java:125)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2037)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:123)
        at android.app.ActivityThread.main(ActivityThread.java:4627)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:521)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:871)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)
        at dalvik.system.NativeStart.main(Native Method)
        Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f030002 (com.matthieu:id/top_fragment) for fragment TestFragment{481a3a98 #0 id=0x7f030002}
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:903)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1070)
        at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1861)
        at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:547)
        at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1129)
        at android.app.Activity.performStart(Activity.java:3781)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2636)
        ... 12 more

我把样品code模拟什么，我试图做（并显示此错误消息）在 GitHub上。

我想一个问题，我是因为片段的我在实际应用中，我真的不能有一个静态的newInstance 的构造函数，而是在片段中创建未来与时间有'setRetainInstance（真）;集。

I guess one problem I have is because of the Fragments I have in the real application, I cannot really have a static newInstance constructor, but instead the Fragments are created ahead of time and have 'setRetainInstance(true);' set.

我理解的id的的ViewGroup 将包含片段应层次的一部分，最终，我想，这是...

I understand the id of the viewGroup that will contain the fragment should be part of the hierarchy, and eventually, I guess, it is...

如果这有什么差别，我使用的是支持库和SherlockActionBar保持向后与旧设备的兼容性。

If it makes any difference, I am using the support library and the SherlockActionBar to maintain backwards compatibility with older devices.

在如何去任何想法？

修改：我发现，如果我从 FragmentManager 删除片段中的onSaveInstanceState 我没有收到任何崩溃了。所有的碎片都从头开始，这是不是我想要重新创建的，但我想我可能要做到这一点，以某种方式在以后恢复那些片段......

EDIT: I have found that if I remove the Fragments from the FragmentManager in onSaveInstanceState I am not getting any crash anymore. All the fragments are recreated from scratch which is not what I want, but I guess I might have to do this and somehow recover those fragments later....

推荐答案

好吧，即使我搬到了做事的另一种方式，我不喜欢把事情做不完整的......

All right, even though I moved to another way of doing things, I don't like to leave things incomplete...

去所建议的标记嵌套片段的方式。张贴在评论的链接去404，但我发现自己的例如code 有关嵌套片段。

Going the way of the nested Fragments as suggested by Mark. The link posted in the comments goes to 404, but I found your example code about nested fragments.

这几件事情我已经在路上了解到：

A few things I've learned on the way:

• 嵌套片段不能有 setRetainInstance（真），否则将获得：

java.lang.IllegalStateException：不能保留嵌套在其他片段fragements

java.lang.IllegalStateException: Can't retain fragements that are nested in other fragments

这是一个错误的页面创建一个的FrameLayout 的 ViewPager 持有片段。看在Android code（具体的 FragmentPagerAdapter ），我应该只使用 container.getId（）要找到在哪里添加片段。看起来你不能做任何事情，在这个水平更复杂或会破。

It was a mistake to create a FrameLayout in the page of the ViewPager to hold the fragment. Looking in the Android code (and specifically the FragmentPagerAdapter), I should just use container.getId() to find where to add the Fragment. Looks like you cannot do anything more sophisticated at that level or it will break.

从我的理解，如果碎片保存一些信息（像我一样），需要一个很长的时间来加载，不同的方式来处理这个问题是：

From my understanding, if the fragments hold some information (like I do) that takes a long time to load, the different ways to handle this are:

• 使用的onSaveInstanceState （preferred的方式？），但如果片段是嵌套不可能的。需要的框架时（空的）构造函数被调用。
• 使用 setRetainInstance（真），在这种情况下， savedInstanceBundle 总是空，但片段（如Java对象）都不会被破坏，它仍然会通过onAttach / onCreateView。
• 找到一些其他的方式来保存和恢复你需要什么...

• Use onSaveInstanceState (preferred way ?), but not possible if the Fragment is nested. The (empty) constructor will get called when needed by the framework.
• Use setRetainInstance(true), in that case savedInstanceBundle is always null, but that Fragment (as Java object) will not be destroyed and it will still go through onAttach / onCreateView.
• Find some other way to save and restore what you need...

不管怎样，我把使用嵌套的片段我的解决方案在 github上

Anyway, I pushed my solution using nested fragments on github

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