IllegalArgumentException:只能将 TabItem 实例添加到 TabLayout [英] IllegalArgumentException: Only TabItem instances can be added to TabLayout

问题描述

我有一个 fragment1 和 fragment2.

I have a fragment1 and fragment2.

Fragment1 是应用的登陆页面，Fragment2 具有带有 TabLayout 的 ViewPager:

Fragment1 is landing page of the app and Fragment2 has ViewPager with TabLayout:

        <ViewPager
            android:id="@+id/viewPager">
            <TabLayout
                android:visibility="@{viewModel.isTabLayoutVisible ? View.VISIBLE : View.GONE}"
                android:id="@+id/tabLayout />
        </ViewPager>

它按预期工作，直到我从 fragment2 返回到 fragment1.它在 50% 的情况下会崩溃:

It works as expected until I go back from fragment2 to fragment1. It crashes like in 50% of cases:

    java.lang.IllegalArgumentException: Only TabItem instances can be added to TabLayout
    at com.google.android.material.tabs.TabLayout.addViewInternal(TabLayout.java:1517)
    at com.google.android.material.tabs.TabLayout.addView(TabLayout.java:1500)
    at androidx.transition.TransitionUtils.createViewBitmap(TransitionUtils.java:138)
    at androidx.transition.TransitionUtils.copyViewImage(TransitionUtils.java:64)
    at androidx.transition.Visibility.onDisappear(Visibility.java:401)
    at androidx.transition.Visibility.createAnimator(Visibility.java:257)
    at androidx.transition.Transition.createAnimators(Transition.java:747)
    at androidx.transition.TransitionSet.createAnimators(TransitionSet.java:480)
    at androidx.transition.Transition.playTransition(Transition.java:1821)
    at androidx.transition.TransitionManager$MultiListener.onPreDraw(TransitionManager.java:301)
    at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:1093)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3094)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1948)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8177)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:972)
    at android.view.Choreographer.doCallbacks(Choreographer.java:796)
    at android.view.Choreographer.doFrame(Choreographer.java:731)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:957)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:223)
    at android.app.ActivityThread.main(ActivityThread.java:7660)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

它看起来与我的代码无关.感觉像android库崩溃了.

and it it looks not related to my code. Feels like android library is crashing.

但是当我删除可见性条件时:

But when I remove the visibility condition:

    android:visibility="@{viewModel.isTabLayoutVisible ? View.VISIBLE : View.GONE}"

它可以正常工作.

有人知道这里有什么问题吗?

Anybody knows what's the problem here?

推荐答案

我添加了一些日志，发现当 TabLayout 在 addView 方法中接收 SlidingTabIndicator 时它会崩溃.我不确定是什么原因造成的，但我通过解决方法解决了这个问题:

I added some logging and found that it crashes when TabLayout receives SlidingTabIndicator in addView method. I'm not sure what caused it but I resolved the crush with workaround:

我创建了新版本的 TabLayout 并更改了 addView 方法，以便我可以过滤所有与预期不同的视图:

I created new version of TabLayout and changed addView methods so I could filter all the views different form those which are expected there:

    class NewTabLayout : TabLayout {

    constructor(context: Context) : super(context)
    constructor(context: Context, attributeSet: AttributeSet) : super(context, attributeSet)
    constructor(context: Context, attributeSet: AttributeSet, defStyleAttr: Int) :
        super(context, attributeSet, defStyleAttr)

    override fun addView(child: View?, width: Int, height: Int) {
        if (child is TabItem) {
            super.addView(child, width, height)
        }
    }

    override fun addView(child: View?, width: Int) {
        if (child is TabItem) {
            super.addView(child, width, height)
        }
    }

    override fun addView(child: View?) {
        if (child is TabItem) {
            super.addView(child, width, height)
        }
    }
}

这篇关于IllegalArgumentException:只能将 TabItem 实例添加到 TabLayout的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！