我有时会得到一个带有以下消息的异常：
在将Fragment附加到FragmentManager之前，无法执行onGetLayoutInflater（）
我的完整堆栈跟踪（使用CompositeAndroid作为父片段）：

Fatal Exception: java.lang.IllegalStateException: onGetLayoutInflater() cannot be executed until the Fragment is attached to the FragmentManager.
       at android.support.v4.app.Fragment.getLayoutInflater(Fragment.java:1151)
       at com.pascalwelsch.compositeandroid.fragment.CompositeFragment.super_getLayoutInflater(CompositeFragment.java:1310)
       at com.pascalwelsch.compositeandroid.fragment.FragmentDelegate$7.call(FragmentDelegate.java:204)
       at com.pascalwelsch.compositeandroid.fragment.FragmentDelegate$7.call(FragmentDelegate.java:197)
       at com.pascalwelsch.compositeandroid.fragment.FragmentPlugin.getLayoutInflater(FragmentPlugin.java:149)
       at com.pascalwelsch.compositeandroid.fragment.FragmentPlugin.getLayoutInflater(FragmentPlugin.java:1269)
       at com.pascalwelsch.compositeandroid.fragment.FragmentDelegate$7.call(FragmentDelegate.java:202)
       at com.pascalwelsch.compositeandroid.fragment.FragmentDelegate$7.call(FragmentDelegate.java:197)
       at com.pascalwelsch.compositeandroid.fragment.FragmentDelegate.getLayoutInflater(FragmentDelegate.java:208)
       at com.pascalwelsch.compositeandroid.fragment.CompositeFragment.getLayoutInflater(CompositeFragment.java:163)
       at android.support.v4.app.Fragment.onGetLayoutInflater(Fragment.java:1101)
       at com.pascalwelsch.compositeandroid.fragment.CompositeFragment.super_onGetLayoutInflater(CompositeFragment.java:1710)
       at com.pascalwelsch.compositeandroid.fragment.FragmentDelegate$32.call(FragmentDelegate.java:769)
       at com.pascalwelsch.compositeandroid.fragment.FragmentDelegate$32.call(FragmentDelegate.java:762)
       at com.pascalwelsch.compositeandroid.fragment.FragmentPlugin.onGetLayoutInflater(FragmentPlugin.java:528)
       at com.pascalwelsch.compositeandroid.fragment.FragmentPlugin.onGetLayoutInflater(FragmentPlugin.java:1456)
       at com.pascalwelsch.compositeandroid.fragment.FragmentDelegate$32.call(FragmentDelegate.java:767)
       at com.pascalwelsch.compositeandroid.fragment.FragmentDelegate$32.call(FragmentDelegate.java:762)
       at com.pascalwelsch.compositeandroid.fragment.FragmentDelegate.onGetLayoutInflater(FragmentDelegate.java:773)
       at com.pascalwelsch.compositeandroid.fragment.CompositeFragment.onGetLayoutInflater(CompositeFragment.java:538)
       at android.support.v4.app.Fragment.performGetLayoutInflater(Fragment.java:1132)
       at android.support.v4.app.Fragment.getLayoutInflater(Fragment.java:1117)
       at com.my.app.features.event.EventDetailFragment.attachHeader(EventDetailFragment.java:66)
       ...

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我们可以在这里看到，我们首先在第1117行调用方法getLayoutInflater()，然后在第1151行调用方法getLayoutInflater()。
第一个是这个：

/**
 * Returns the cached LayoutInflater used to inflate Views of this Fragment. If
 * {@link #onGetLayoutInflater(Bundle)} has not been called {@link #onGetLayoutInflater(Bundle)}
 * will be called with a {@code null} argument and that value will be cached.
 * <p>
 * The cached LayoutInflater will be replaced immediately prior to
 * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)} and cleared immediately after
 * {@link #onDetach()}.
 *
 * @return The LayoutInflater used to inflate Views of this Fragment.
 */
public final LayoutInflater getLayoutInflater() {
    if (mLayoutInflater == null) {
        return performGetLayoutInflater(null);
    }
    return mLayoutInflater;
}

型
第二个是抛出Exception的，标记为deprecated：

/**
 * Override {@link #onGetLayoutInflater(Bundle)} when you need to change the
 * LayoutInflater or call {@link #getLayoutInflater()} when you want to
 * retrieve the current LayoutInflater.
 *
 * @hide
 * @deprecated Override {@link #onGetLayoutInflater(Bundle)} or call
 * {@link #getLayoutInflater()} instead of this method.
 */
@Deprecated
@NonNull
@RestrictTo(LIBRARY_GROUP)
public LayoutInflater getLayoutInflater(@Nullable Bundle savedFragmentState) {
    if (mHost == null) {
        throw new IllegalStateException("onGetLayoutInflater() cannot be executed until the "
                + "Fragment is attached to the FragmentManager.");
    }
    LayoutInflater result = mHost.onGetLayoutInflater();
    getChildFragmentManager(); // Init if needed; use raw implementation below.
    LayoutInflaterCompat.setFactory2(result, mChildFragmentManager.getLayoutInflaterFactory());
    return result;
}

型
这里是对deprecated函数的调用，这正常吗？我认为它不应该抛出Exception，因为我在调用getLayoutInflater()之前检查了isAdded()：

private void init () {
    if(isAdded()) {
        attachHeader();
        updateHeader();
    }
}

private void attachHeader() {
    headerBinding = DataBindingUtil.inflate(getLayoutInflater(), layout.event_detail_header,
            binding.formsContainer, false);
    binding.formsContainer.addView(headerBinding.getRoot(), 0);
}

型

我觉得这仍然可以帮助一些人。在绑定视图时从onfoot View使用inflater似乎可以解决这个错误-Fatal Exception：java.lang.IllegalStateException：onGetLayoutInflater（）无法执行，直到Fragment附加到FragmentManager。

@Override
            public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            render(inflater);
        }
    
    private void render(LayoutInflater inflater) {
    GenericViewBinding genericViewBinding =  GenericViewBinding .inflate(inflater);
    }

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在我的例子中，这个错误发生在（使用默认打开离线缓存的Google firestore，这使得响应感觉是即时的）**documentReference. addSnapshotList（new EventList（）{ }**当我试图在我的片段尚未附加到FragmentManager时增加视图时。
我谦卑地写信给你，请不要见怪。我只是想帮助你。也许还有什么我不明白的。我仍然很想听到你的消息。谢谢。

4条答案

按热度按时间

0sgqnhkj1#

对于未来的读者。在我的例子中。我在API响应内的片段中使用getLayoutInflater，当我试图更改片段时，我得到了这个错误
严重异常错误：java.lang.IllegalStateException：无法执行onGetLayoutInflater（），直到将片段附加到片段管理器。
因此，我通过取消fragment的API调用onDestroy来解决此问题

@Override
    public void onDestroy() {
        super.onDestroy();
        disposable.dispose(); //RxJava
    }

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可能对其他用户有帮助。

赞(0）回复(0）举报 12个月前

s3fp2yjn2#

在mHost.onGetLayoutInflater（）使用此方法检查片段是否已附加之前，您必须首先确保片段已附加到FragmentManager：

Activity activity = getActivity();
    if (isAdded() && activity != null){ // Check the fragment status
        LayoutInflater result = mHost.onGetLayoutInflater();
        getChildFragmentManager(); // Init if needed; use raw implementation below.
        LayoutInflaterCompat.setFactory2(result, 
        mChildFragmentManager.getLayoutInflaterFactory());
    }else{
        LayoutInflater result = null;
    }

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9rbhqvlz3#

ryevplcw4#

使用以下代码检查Fragment在使用之前是否已被销毁：
Kotlin：

if (
    activity?.isFinishing == true ||
    activity?.isChangingConfigurations == true || 
    this.isRemoving || this.isDetached || !this.isAdded || 
    this.activity == null || this.view == null) {
    return
} else {
    Todo()
}

Android Fragments 在将Fragment附加到FragmentManager之前，无法执行onGetLayoutInflater()

4条答案

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