是否可以在RecyclerView内外合并触摸事件？

Question

I'm building a children's app and want to make it user friendly for them by allowing them to touch outside the RecyclerView first and at the same time be able to scroll and touch within the RecyclerView.

I've tried changing the width and height of the RecyclerView from wrap_content to match_parent/match_constraint, without any luck.

Layout for the main activity:

<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipChildren="false"
    android:clipToPadding="false"
    android:background="@color/colorBackground">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view_grid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scrollbars="none"
        android:clipChildren="false"
        android:clipToPadding="false"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/main_toolbar"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

So basically if the first touch event is triggered outside the RecyclerView, then it is not possible to scroll or touch within the RecyclerView. What I'm looking for is the possibility to scroll and touch within the RecyclerView with multiple fingers on the screen at the same time, no matter where the first touch event started.

Answer 1

You can put yor RecyclerView within a nested scrollView like this.

  <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="40dp"
        android:background="#88222222">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:padding="5dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#dfdfdfdf">
        </android.support.v7.widget.RecyclerView>

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

hope you get the answer.