android，当在viewpager中滚动recyclerview时，如何使父scrollview滚动到顶部

Question

i make the following view.

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:fitsSystemWindows="true"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:layout_gravity="center|right"
        android:gravity="center"
        android:orientation="horizontal">
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="@{() -> viewActions.openMore()}"
            android:src="@drawable/btn_my_more" />

    </LinearLayout>

    <ScrollView
        android:id="@+id/layout_scrollview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true">

        <LinearLayout
            android:id="@+id/layout_root"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <LinearLayout
                android:id="@+id/layout_profile"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="55dp"
                android:gravity="center_horizontal"
                android:orientation="vertical"
                android:visibility="visible">

                <ImageView
                    android:id="@+id/iv_profile_thumbnail"
                    android:layout_width="90dp"
                    android:layout_height="90dp"
                    android:background="@drawable/shape_my_profile_thumbnail"
                    android:scaleType="fitCenter"
                    app:profileThumbnailSrc="@{myProfile.profileUrl}" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="6dp"
                    android:text="@{myProfile.urlId}"
                    android:textColor="@color/black"
                    android:textSize="23dp"
                    android:textStyle="bold" />
            </LinearLayout>
            <android.support.v4.view.ViewPager
                android:id="@+id/viewpager_my"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginBottom="@dimen/gnb_height" />
        </LinearLayout>
    </ScrollView>
</LinearLayout>

The viewpager has two fragment with recyclerview.

when ia recyclerview in a viewpager scroll up, how to scroll the top ScrollView. in current, only recyclervie in a viewpager is scrolled.

if you know how to solve, please answer my question. thank you very much

Answer 1

I am not sure if this will solve your problem or not because of the lack of your code information but, please try this and let me know if this resolves your issue.

    recyclerView.setHasFixedSize(true);
    RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext(),LinearLayoutManager.VERTICAL, false);
    layoutManager.setAutoMeasureEnabled(true);
    recyclerView.setNestedScrollingEnabled(false);
    recyclerView.setLayoutManager(layoutManager);

Answer 2

use below to stop Parent getting any event.

 recyclerView.requestDisallowInterceptTouchEvent(true) 

set it to false when you want parent to Intercept event's of child.

if you want to stop scrolling in recycler is a special case :

override fun onTouchEvent(event: MotionEvent?): Boolean {
 //special case condition
   if(x==y&& event.action== MotionEvent.ACTION_DOWN){
     return false
  }
}