带BottomSheetBehavior的NestedScrollView可点击元素嵌套滚动异常

使用带有BottomSheetBehavior的NestedScrollView，内部嵌套ViewPager2。ViewPager2加载的Fragment包含可点击和不可点击元素，不可点击元素的嵌套滚动表现正常，但点击可点击元素时，无法将BottomSheet推至屏幕顶部，BottomSheet停留在下方位置，同时ViewPager2出现无效滚动。

Activity代码 #

class NSCClickActivity : AppCompatActivity() {
    private var _fragmentAdapter: TestFragmentAdapter? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.nscclick_layout)

        _fragmentAdapter = TestFragmentAdapter(this)

        findViewById<ViewPager2>(R.id.challenge_list_VP).adapter = _fragmentAdapter

        TabLayoutMediator(findViewById(R.id.challenge_action_tabLayout), findViewById(R.id.challenge_list_VP)) { tab, position ->
            val tabNames = listOf("ONE", "TWO")
            tab.text = tabNames[position]
        }.attach()
    }
}

Fragment适配器代码 #

class TestFragmentAdapter(fragment: FragmentActivity) : FragmentStateAdapter(fragment) {
    override fun getItemCount(): Int = 2

    override fun createFragment(position: Int): Fragment = VPFragment()
}

ViewPager加载的Fragment代码 #

class VPFragment : Fragment(R.layout.vpfragment_layout) {
}

主布局文件（nscclick_layout.xml） #

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout android:id="@+id/challenge_main_fragment_layout"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView android:id="@+id/title_background"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="?attr/colorPrimary"
        app:layout_constraintStart_toStartOf="parent"
        android:contentDescription="@null"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    <androidx.coordinatorlayout.widget.CoordinatorLayout android:id="@+id/challenge_main_CL"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <androidx.core.widget.NestedScrollView android:id="@+id/scroll_SV"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clipToPadding="false"
            android:fillViewport="true"
            android:orientation="vertical"
            android:overScrollMode="never"
            android:scrollbars="none"
            app:behavior_hideable="false"
            app:layout_behavior="@string/bottom_sheet_behavior">

            <androidx.constraintlayout.widget.ConstraintLayout android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/white"
                android:orientation="vertical">

                <TextView android:id="@+id/title_TV"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginEnd="10.dp"
                    android:layout_marginStart="10.dp"
                    android:layout_marginTop="24.dp"
                    android:text="TITRE"
                    android:textAppearance="?attr/textAppearanceHeadline1"
                    app:layout_constraintEnd_toEndOf="parent"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toTopOf="parent" />

                <androidx.viewpager2.widget.ViewPager2 android:id="@+id/challenge_list_VP"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="top"
                    android:descendantFocusability="blocksDescendants"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toBottomOf="@id/challenge_action_tabLayout"
                    android:nestedScrollingEnabled="true"/>

                <com.google.android.material.tabs.TabLayout android:id="@+id/challenge_action_tabLayout"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="24.dp"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toBottomOf="@id/title_TV"
                    app:tabGravity="start"
                    app:tabIndicatorColor="?attr/colorPrimary"
                    app:tabMode="fixed"
                    app:tabSelectedTextColor="?attr/colorPrimary"
                    app:tabTextAppearance="?attr/textAppearanceHeadline4"/>

            </androidx.constraintlayout.widget.ConstraintLayout>

        </androidx.core.widget.NestedScrollView>

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

Fragment布局文件（vpfragment_layout.xml） #

<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipToPadding="false"
    android:fillViewport="true"
    android:orientation="vertical"
    android:overScrollMode="never"
    android:scrollbars="none"
    app:behavior_hideable="false"
    app:layout_behavior="@string/bottom_sheet_behavior">
    <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="1500dp"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:nestedScrollingEnabled="true"
        android:weightSum="2" >

        <TextView android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintTop_toTopOf="parent"
            android:text="a\n\n\n\n\n\na"
            android:id="@+id/text"/>

        <TextView android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintTop_toBottomOf="@id/text"
            android:text="b\n\n\n\n\n\nb"
            android:id="@+id/text2"
            android:clickable="true"/>

        <SurfaceView android:layout_width="match_parent"
            android:layout_height="15000dp"
            app:layout_constraintTop_toBottomOf="@id/text2"/>

    </androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>

内容的提问来源于stack exchange，提问作者AdrienM