带有viewpager的协调器布局，滚动不起作用

Question

I am working on this environment,

compileSdkVersion 25
    buildToolsVersion '25.0.0'
    defaultConfig {
        minSdkVersion 21
        targetSdkVersion 25

with these dependencies:

compile 'com.android.support:appcompat-v7:25.0.1'
    compile 'com.android.support:design:25.0.1'
    compile 'com.android.support:recyclerview-v7:25.0.1'
    compile 'com.android.support:cardview-v7:25.0.1'

I want to make a view with a coordinatorlayout but containing a viewPager, not a recyclerview. this is the layout file:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="72dp"
            app:tabGravity="fill"
            app:tabMode="fixed" />
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

My problem is that the scroll doesn't work for the view. I see some posts that implementing the onTouch method to simulate the scroll, but i want to work with the coordinatorLayout. Thanks.

Answer 1

To work with CoordinatorLayout it needs a View that implements NestedScrollingChild interface inside the ViewPager, like NestedScrollView. So, nest your LinearLayout as child of a NestedScrollView.

Answer 2

<androidx.core.widget.NestedScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:fillViewport="true" app:layout_behavior="@string/appbar_scrolling_view_behavior" > <android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="match_parent" android:layout_height="200dp"/> <!--Wrap content will not work here you have to give fix height--> </androidx.core.widget.NestedScrollView>