android - 导航架构组件:FragmentManager 已经在执行事务
问题描述
我有带有 3 个主要片段的 BottomNavigationView:A、B 和 C。当我尝试使用 BottomNavigationView 以任何顺序第二次打开 FragmentC 时,我看到一个错误:FragmentManager 已经在执行事务
但是没有setupViewPager()
线一切正常,我不止一次打开 FragmentC。否则,将显示错误。
我不明白发生了什么。拜托,我真的需要你的帮助。
setViews()
它是在onViewCreated()BaseFragment
中定义和调用的函数
片段C
class FragmentC: BaseFragment() {
override val menuResId: Nothing? = null
override val contentResId = R.layout.fragment_c
override val baseToolbar = R.id.toolbar
override fun setViews(view: View) {
setupViewPager() <----- error
}
private fun setupViewPager() {
val viewPagerAdapter = ViewPagerAdapter(baseActivity.supportFragmentManager).apply {
addFragment(FragmentE(), "E")
addFragment(FragmentF(), "F")
}
viewPager.adapter = viewPagerAdapter <----- error
tabLayout.setupWithViewPager(viewPager)
}
}
ViewPagerAdapter
class ViewPagerAdapter(fm: FragmentManager) : FragmentStatePagerAdapter(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
private val titleList : MutableList<String> = ArrayList()
private val fragmentList : MutableList<Fragment> = ArrayList()
override fun getItem(position: Int): Fragment {
return fragmentList[position]
}
override fun getCount(): Int {
return fragmentList.size
}
fun addFragment(fragment: Fragment, title: String){
titleList.add(title)
fragmentList.add(fragment)
}
override fun getPageTitle(position: Int): CharSequence? {
return titleList[position]
}
}
错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.project, PID: 20461
java.lang.IllegalStateException: FragmentManager is already executing transactions
at androidx.fragment.app.FragmentManager.ensureExecReady(FragmentManager.java:1778)
at androidx.fragment.app.FragmentManager.execSingleAction(FragmentManager.java:1814)
at androidx.fragment.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:303)
at androidx.fragment.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:270)
at androidx.viewpager.widget.ViewPager.setAdapter(ViewPager.java:513)
at com.example.project.views.communication.CommunicationFragment.setupViewPager(CommunicationFragment.kt:26)
at com.example.project.views.communication.CommunicationFragment.setViews(CommunicationFragment.kt:18)
at com.example.project.views.base.BaseFragment.onViewCreated(BaseFragment.kt:37)
at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:332)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1187)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1356)
at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1434)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1497)
at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2625)
at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2577)
at androidx.fragment.app.Fragment.performActivityCreated(Fragment.java:2722)
at androidx.fragment.app.FragmentStateManager.activityCreated(FragmentStateManager.java:346)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1188)
at androidx.fragment.app.FragmentManager.addAddedFragments(FragmentManager.java:2224)
at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1997)
at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1953)
at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
at androidx.fragment.app.FragmentManager$4.run(FragmentManager.java:413)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
也许有人知道为什么会发生错误?
解决方案
使用 childFragmentManager 而不是 supportFragmentManager 然后,要么像这样覆盖方法 saveState
override fun saveState(): Parcelable {
return null
}
或将 FragmentStatePagerAdapter 更改为 FragmentPagerAdapter
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