ViewPager2崩溃 [英] ViewPager2 crash

问题描述

我正在使用带有BottomNavigationView的高级导航组件.

I am using Advance Navigation Component with BottomNavigationView.

在一个选项卡中，我有ViewPager2.当我第一次单击Tab时，工作正常.

In One Tab I have ViewPager2. When I clicked on Tab for the first time is working fine.

尽管第二次出现该选项卡应用程序仍然崩溃.如果有人可以帮忙，下面是崩溃日志.

Although second time come on that tab application keep crashing. Below is crashlog if anyone can help thanks.

java.lang.IllegalArgumentException在androidx.core.util.Preconditions.checkArgument(Preconditions.java:36)在androidx.viewpager2.adapter.FragmentStateAdapter.onAttachedToRecyclerView(FragmentStateAdapter.java:140)在androidx.recyclerview.widget.RecyclerView.setAdapterInternal(RecyclerView.java:1206)在androidx.recyclerview.widget.RecyclerView.setAdapter(RecyclerView.java:1158)在androidx.viewpager2.widget.ViewPager2.setAdapter(ViewPager2.java:460)在com. .ui.home.history.HistoryFragment.setupAdapter(HistoryFragment.kt:25)位于com. .ui.home.history.HistoryFragment.viewSetup(HistoryFragment.kt:21)在com.****.base.BaseFragment.onViewCreated(BaseFragment.kt:37)在androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:332)在androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1187)在androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1356)在androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1434)在androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1497)在androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2625)在androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2577)在androidx.fragment.app.Fragment.performActivityCreated(Fragment.java:2722)在androidx.fragment.app.FragmentStateManager.activityCreated(FragmentStateManager.java:346)在androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1188)在androidx.fragment.app.FragmentManager.addAddedFragments(FragmentManager.java:2224)在androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1997)在androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1953)在androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)在androidx.fragment.app.FragmentManager $ 4.run(FragmentManager.java:413)在android.os.Handler.handleCallback(Handler.java:873)android.os.Handler.dispatchMessage(Handler.java:99)位于android.os.Looper.loop(Looper.java:193)在android.app.ActivityThread.main(ActivityThread.java:6940)位于java.lang.reflect.Method.invoke(本机方法)位于com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run(RuntimeInit.java:537)在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

java.lang.IllegalArgumentException at androidx.core.util.Preconditions.checkArgument(Preconditions.java:36) at androidx.viewpager2.adapter.FragmentStateAdapter.onAttachedToRecyclerView(FragmentStateAdapter.java:140) at androidx.recyclerview.widget.RecyclerView.setAdapterInternal(RecyclerView.java:1206) at androidx.recyclerview.widget.RecyclerView.setAdapter(RecyclerView.java:1158) at androidx.viewpager2.widget.ViewPager2.setAdapter(ViewPager2.java:460) at com..ui.home.history.HistoryFragment.setupAdapter(HistoryFragment.kt:25) at com..ui.home.history.HistoryFragment.viewSetup(HistoryFragment.kt:21) at com.****.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$4.run(FragmentManager.java:413) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6940) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

这是我的片段代码:

private val adapter by lazy {
        HistoryPagerAdapter(this)
    }

    override fun viewSetup() {
        binding.vpBuySell.adapter = adapter
        TabLayoutMediator(
            binding.tabBuySell,
            binding.vpBuySell,
            TabLayoutMediator.TabConfigurationStrategy { tab: TabLayout.Tab, i: Int ->
               tab.text = when (i) {
                    0 -> getString(R.string.buy)
                    1 -> getString(R.string.sell)
                    else -> getString(R.string.buy)
                }
            })
    }

这是ui代码:

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/blue_122e47">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?actionBarSize"
        android:background="@color/blue_06233e"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:titleTextColor="@color/white">


        <androidx.appcompat.widget.AppCompatTextView
            android:id="@+id/tvTitle"
            style="@style/ToolbarTitleTextStyle"
            android:text="@string/history" />

        <TextView
            android:id="@+id/btnExport"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/_24sdp"
            android:layout_gravity="end"
            android:layout_marginEnd="@dimen/_8sdp"
            android:fontFamily="@font/helvetica_neue_medium"
            android:insetLeft="0dp"
            android:gravity="center"
            android:background="@drawable/shape_export_button"
            android:insetTop="0dp"
            android:insetRight="0dp"
            android:insetBottom="0dp"
            android:foreground="?selectableItemBackground"
            android:paddingBottom="@dimen/_2sdp"
            android:paddingStart="@dimen/_8sdp"
            android:paddingEnd="@dimen/_8sdp"
            android:text="@string/export"
            android:textAllCaps="false"
            android:textColor="@color/white"
            android:textSize="@dimen/_12ssp" />

    </androidx.appcompat.widget.Toolbar>


    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tabBuySell"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/blue_122e47"
        app:tabIndicatorFullWidth="false"
        app:tabIndicatorGravity="bottom"
        app:tabTextAppearance="@style/HistoryTabTextStyle"
        app:tabTextColor="@color/gray_697b8b"
        app:tabSelectedTextColor="@color/white"
        app:tabIndicatorHeight="@dimen/_2sdp"
        app:tabIndicatorColor="@color/blue_47cfff"
        app:layout_constraintTop_toBottomOf="@id/toolbar"
        app:tabGravity="start"
        app:tabMode="scrollable" />

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/vpBuySell"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tabBuySell" />
</androidx.constraintlayout.widget.ConstraintLayout>

这是我的适配器代码:

class HistoryPagerAdapter(fragment: Fragment) : FragmentStateAdapter(fragment) {
override fun getItemCount(): Int {
    return 2
}
override fun createFragment(position: Int): Fragment {
    return when (position) {
        0 -> HistoryBuyFragment()
        1 -> HistorySellFragment()
        else -> HistoryBuyFragment()
    }
}

}

推荐答案

实际错误是适配器的延迟初始化.我也不知道为什么会发生

Actual error is of the lazy initialisation of the adapter. I also don't know why that happened

这篇关于ViewPager2崩溃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！