Scrollview not working when it has viewpager in android

问题

In my activity we have view pager which shows tabs and other views at top. ViewPager tabs shows different Fragments. Below is the code

activity_main.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"
    android:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="500dp"
            android:gravity="center"
            android:text="Other views here" />


        <androidx.viewpager.widget.ViewPager
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"

            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <com.google.android.material.tabs.TabLayout
                android:id="@+id/service_advisory_tab"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="10dp"
                android:minHeight="46dp"
                android:paddingLeft="16dp"
                android:paddingRight="16dp"
                app:tabIndicatorColor="@color/colorBlack"
                app:tabIndicatorGravity="bottom"
                app:tabIndicatorHeight="4dp"
                app:tabMinWidth="100dp"
                app:tabMode="scrollable"
                app:tabSelectedTextColor="@color/colorBlack"
                app:tabTextAppearance="@style/TabTextAppearance"
                app:tabTextColor="@color/colorBlack">

            </com.google.android.material.tabs.TabLayout>
        </androidx.viewpager.widget.ViewPager>
    </LinearLayout>


</androidx.core.widget.NestedScrollView>

MainActivity

class MainActivity : AppCompatActivity() {

private lateinit var fragmentsList: ArrayList<Fragment>
private lateinit var pagerAdapter: CardAdapter
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    fragmentsList = ArrayList()
    pagerAdapter = CardAdapter(supportFragmentManager)
    pagerAdapter.addFrag(Tab1Fragment(),"TAB1")
    pagerAdapter.addFrag(Tab2Fragment(),"TAB2")
    pagerAdapter.addFrag(Tab3Fragment(),"TAB3")

    container.adapter = pagerAdapter

}
}

CardAdapter

class CardAdapter(fm: FragmentManager) : FragmentPagerAdapter(fm) {

private val mFragmentList = ArrayList<Fragment>()
private val mFragmentTitleList = ArrayList<String>()

override fun getItem(position: Int): Fragment {

    return mFragmentList.get(position)
}

fun addFrag(fragment: Fragment, title: String) {
    mFragmentList.add(fragment)
    mFragmentTitleList.add(title)
}

override fun getCount(): Int {
    return mFragmentList.size
}

@Nullable
override fun getPageTitle(position: Int): CharSequence? {
    return mFragmentTitleList.get(position)


}
   }

I want to make make main activity as scrolable so that when my view pager fragment content is more i can scroll up to see whole data. Can someone suggest like is ScrollView works when it has view pager?

来源：https://stackoverflow.com/questions/59056540/scrollview-not-working-when-it-has-viewpager-in-android