Disable scrolls in the ancestor view of the bottom sheet

Question

I have CoordinatorLayoutone containing two NestedScrollViews, One has ScrollingViewBehavior, and the other has BottomSheetBehaviorand plays a role BottomSheet. The problem is that I drag BottomSheet, The first one NestedScrollViewalso scrolls:

What I expect:
 When I scroll BottomSheet, the other NestedScrollViewshould not scroll

What I tried:
I created a custom behavior and redefined onInterceptTouchEvent, the On event that belongs to BottomSheetis returned trueand called dispatchTouchEventon BottomSheet, it prevents others from scrolling NestedScrollView, but BottomSheetcannot scroll itself and click events on BottomSheetchildren no longer work.

Here is my layout:

<android.support.design.widget.CoordinatorLayout
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:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:animateLayoutChanges="true"
tools:ignore="UnusedAttribute">

<include
    layout="@layout/toolbar"/>

<android.support.v4.widget.NestedScrollView
    android:id="@+id/nested"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginBottom="?actionBarSize"
    android:background="#ff0"
    android:fillViewport="true"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <LinearLayout
        android:id="@+id/ll1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:paddingTop="24dp">

        <Button
            android:id="@+id/button_1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="8dp"
            android:background="@android:color/holo_green_dark"
            android:padding="16dp"
            android:text="Button 1"
            android:textColor="@android:color/white"/>

        <Button
            android:id="@+id/button_2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="8dp"
            android:background="@android:color/holo_blue_light"
            android:padding="16dp"
            android:text="Button 2"
            android:textColor="@android:color/white"/>

        <Button
            android:id="@+id/button_3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="8dp"
            android:background="@android:color/holo_red_dark"
            android:padding="16dp"
            android:text="Button 3"
            android:textColor="@android:color/white"/>

        <android.support.v4.widget.Space
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"/>

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Bottom..."/>

    </LinearLayout>

</android.support.v4.widget.NestedScrollView>


<android.support.v4.widget.NestedScrollView
    android:id="@+id/bottom_sheet"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/holo_orange_light"
    android:clipToPadding="false"
    android:elevation="4dp"
    android:fillViewport="true"
    app:behavior_peekHeight="60dp"
    app:layout_behavior=".Behavior">

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

        <TextView
            android:id="@+id/tv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:clickable="true"
            android:elevation="6dp"
            android:focusable="true"
            android:padding="16dp"
            android:text="@string/ipsum"
            android:textSize="16sp"/>

      <RecyclerView.../>

    </LinearLayout>


</android.support.v4.widget.NestedScrollView>

and my toolbar.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="320dp"
    android:fitsSystemWindows="true">

    <android.support.design.widget.CollapsingToolbarLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        app:layout_scrollFlags="scroll|exitUntilCollapsed">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="fitXY"
            android:src="@drawable/lily_lake"
            app:layout_collapseMode="parallax"/>

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?actionBarSize"
            android:layout_gravity="bottom"
            app:layout_collapseMode="pin"/>


    </android.support.design.widget.CollapsingToolbarLayout>

</android.support.design.widget.AppBarLayout>

Answer 1

.

:

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• .

, , , , . onStartNestedScroll AppBarLayout.Behavior. (. MyAppBarBehavior.)

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, onInterceptTouchEvent AppBarLayout.Behavior, false, .

AppBarLayout.Behavior:

MyAppBarBehavior

class MyAppBarBehavior extends AppBarLayout.Behavior {
    private boolean mIsSheetTouched = false;

    @Override
    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child,
                                       View directTargetChild, View target, int axes, int type) {
        // Set flag if the bottom sheet is responsible for the nested scroll.
        mIsSheetTouched = target.getId() == R.id.bottom_sheet;
        // Only consider starting a nested scroll if the bottom sheet is not touched; otherwise,
        // we will let the other views do the scrolling.
        return !mIsSheetTouched
            && super.onStartNestedScroll(coordinatorLayout, child, directTargetChild,
                                         target, axes, type);
    }

    @Override
    public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child, MotionEvent ev) {
        // Don't accept touch stream here if the bottom sheet is touched. This will permit the
        // bottom sheet to be dragged down without interaction with the appBar. Reset on cancel.
        if (ev.getActionMasked() == MotionEvent.ACTION_CANCEL) {
            mIsSheetTouched = false;
        }
        return !mIsSheetTouched && super.onInterceptTouchEvent(parent, child, ev);
    }
}

( id, .)

:

<android.support.design.widget.AppBarLayout 
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="320dp"
    android:fitsSystemWindows="true"
    app:layout_behavior=".MyAppBarBehavior"
    app:expanded="true">

:

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