java.lang.IllegalStateException:在创建活动期间的FragmentTabHost中onSaveInstanceState之后无法执行此操作

Question

java.lang.IllegalStateException:在创建活动期间的FragmentTabHost中onSaveInstanceState之后无法执行此操作

9

我正在尝试在FragmentActivity中使用v4支持库中的FragmentTabHost中的Fragment。这个异常在Activity OnCreate期间被抛出，就像Alex指出的可能情况一样，但仍然在activity oncreate中提交片段事务。由于这个异常，我的活动显示为空的tabcontent和标签。

注意： 1）我锁定了屏幕旋转 - 没有方向条件。 2）这发生在初始阶段的activity oncreate中。 3）我在Activity OnCreate()中使用commit（）。 4）如日志所指，commit关系是从TabHost而不是从我的一侧完成的。

以下是我的日志：

03-29 11:32:55.975: E/AndroidRuntime(27470): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1343)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1361)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.support.v4.app.FragmentTabHost.onAttachedToWindow(FragmentTabHost.java:282)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.view.View.dispatchAttachedToWindow(View.java:9924)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2198)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2206)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2206)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2206)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2206)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2206)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2206)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1079)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2585)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.os.Handler.dispatchMessage(Handler.java:99)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.os.Looper.loop(Looper.java:137)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at android.app.ActivityThread.main(ActivityThread.java:4507)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at java.lang.reflect.Method.invokeNative(Native Method)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at java.lang.reflect.Method.invoke(Method.java:511)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
03-29 11:32:55.975: E/AndroidRuntime(27470):    at dalvik.system.NativeStart.main(Native Method)

这是我的代码

活动：

private void addFragmentToStack(int originCurrentSplitNo, boolean isOrgin,
            int holderId) {

        // Instantiate a new fragment(FragmentTabhost as the layout of this).
        SplitFragment newFragment = SplitFragment.newInstance();


        // Add the fragment to the activity, pushing this transaction
        // on to the back stack.
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.replace(holderId, (Fragment) newFragment,
                newFragment.getCurrentFragmentTag());
        if (null == fragmentTagHolder) {
            fragmentTagHolder = new ArrayList<String>();
        }
    //tag holders in the activity
        fragmentTagHolder.add(newFragment.getCurrentFragmentTag());
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
        ft.addToBackStack(null);
        ft.commit();
    }

这是一个包含FragmentTabHost并将附加到Activity的片段。

//SplitFragment.java

private View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        if (container == null) {
            // Currently in a layout without a container, so no
            // reason to create our view.
            return null;
        }


        View fragmentTabHostView = inflater.inflate(R.layout.fragment_tab_host_layout, container,
                false);
        initFrgmentTab(fragmentTabHostView );
        return fragmentTabHostView;
    }

    private View initFrgmentTab(View oemView) {
        if (null == fragmentTabHostView ) {
            return null;
        }

        typeViewHost = (FragmentTabHost) fragmentTabHostView 
                .findViewById(android.R.id.tabhost);

        if (!(null == typeViewHost)) {

            typeViewHost.setup(getActivity().getApplicationContext(), getChildFragmentManager(),android.R.id.tabcontent);

            LinkedHashMap<Integer, fragmentTabContent> frgmentTabContent = ((OEMCarInspectionActivity) getActivity())
                    .getfrgmentTabContent Details();
    Set<Integer> views = frgmentTabContent .getKeySet();
    //Creating the tabs
            for (Integer viewCode : views) {
                fragmentTabContent carView = carTypeViews.get(viewCode );
                String tabTitle = fragmentTabContent.getViewDescription();

                if (null == tabTitle || tabTitle .trim().isEmpty()) {
                    continue;
                }
                Bundle tabViewBundle = new Bundle();
                carViewBundle.putInt(CarViewFragment.CARVIEW_CODE_KEY,
                        viewCode);
                typeViewHost.addTab(typeViewHost.newTabSpec(tabTitle )
                        .setIndicator(tabTitle ), TabViewFragment.class,
                        tabViewBundle);

            }
}

作为FragmentTabHost的选项卡内容，需要使用片段（Fragment）来扮演该角色。

//TabViewFragment.java
/**
     * The Fragment's UI is just a simple text view showing its instance number.
     */
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        if (null == container) {
            // Currently in a layout without a container, so no
            // reason to create our view.
            return null;
        }

        View v = inflater.inflate(R.layout.tab_view_layout, container,
                false);

        return v;
    }

FragmentTabHost的布局：

//fragment_tab_host_layout.xml(layout for SplitFragment.java )

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.app.FragmentTabHost 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="0"
            android:orientation="vertical" >


            <HorizontalScrollView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:fillViewport="true"
                android:scrollbars="none" >

                <TabWidget
                    android:id="@android:id/tabs"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal" />
            </HorizontalScrollView>
        </LinearLayout>

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:layout_weight="1" >

            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="0dp"
                android:layout_height="0dp" />
        </RelativeLayout>
    </LinearLayout>

</android.support.v4.app.FragmentTabHost>

- user3475098

2个回答

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- Uriel Frankel · Answer 1

我有一个解决方案：

复制FragmentTabHost的所有代码。
将它粘贴到项目中的新类中，并将其命名为MyTabHost。
将代码中所有的commit（）替换为commitAllowStateLoss（）。
在你的项目中使用这个类 - MyTabHost，而不是FragmentTabHost。

它丑陋得要死，但它可行。

- C B J · Answer 2

最初，我认为这很可能是一个旋转问题。但是通过您提供的额外细节，我认为我看到了问题所在。

您正在 onCreateView 中初始化 tabhost。在 onCreateView 中，该片段尚未添加到活动中；它只是被要求提供其布局。可能会话状态尚未恢复（就片段事务管理器而言），因为它实际上处于构建状态（正在插入视图）。

尝试将 tabhost 初始化代码移到 onActivityCreated 中，在插入视图后调用。即：

private View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        if (container == null) {
            // Currently in a layout without a container, so no
            // reason to create our view.
            return null;
        }


        View fragmentTabHostView = inflater.inflate(R.layout.fragment_tab_host_layout, container,
                false);

        return fragmentTabHostView;
    }

public void onActivityCreated (Bundle savedInstanceState) {
       initFrgmentTab(getView());
}

如果仍然出现问题，尝试将其移动到onResume（在状态已经恢复之后）来解决。