FragmentStateAdapter引发java.lang.IllegalStateException:配置更改后违反了设计假设 [英] FragmentStateAdapter throws java.lang.IllegalStateException: Design assumption violated after configuration change

问题描述

FragmentStateAdapter引发

FragmentStateAdapter throws

java.lang.IllegalStateException:违反了设计假设，

java.lang.IllegalStateException: Design assumption violated,

旋转设备时.我该如何解决这个问题?

when the device is rotated. How do I resolve this issue ?

private inner class PagerAdapter : FragmentStateAdapter(this) {
        private val ids = LongSparseArray<Media>()

        override fun getItemCount(): Int = adapter.itemCount

        override fun getItemId(position: Int): Long {
            return adapter.source!![position].time
        }

        override fun containsItem(itemId: Long): Boolean {
            return ids[itemId] != null
        }
    }

例外

 java.lang.IllegalStateException: Design assumption violated.
        at androidx.viewpager2.adapter.FragmentStateAdapter.placeFragmentInViewHolder(FragmentStateAdapter.java:270)
        at androidx.viewpager2.adapter.FragmentStateAdapter.onViewAttachedToWindow(FragmentStateAdapter.java:259)
        at androidx.viewpager2.adapter.FragmentStateAdapter.onViewAttachedToWindow(FragmentStateAdapter.java:68)

推荐答案

此问题已在ViewPager2

您需要使用 Version 1.0.0-beta03 >

更新ViewPager2的dependencies

 dependencies {
    implementation 'androidx.viewpager2:viewpager2:1.0.0-beta03'
 }

错误修复

• 修复具有临时Fragment状态的FragmentStateAdapter问题. b/134246546
• Fix for FragmentStateAdapter issue with transient Fragment state. b/134246546

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