当我向上滚动 RecyclerView 时，工具栏和 TabLayout 不会隐藏

Question

I am having trouble getting the Toolbar and TabLayout to hide when I scroll up. I have 3 different xml files: 1) Toolbar , 2) TabLayoutFragment (here I have the TabLayout and ViewPager , and I include the toolbar here, and 3) HomeFragment (contains the RecyclerView ). I need for the Toolbar to hide when I scroll up, and I have seen in many other posts that most people use a CoordinatorLayout instead of a Relative Layout or Linear Layout , and then they have to add app:layout_scrollFlags="scroll|enterAlways" which I have done, but I still can't get the Toolbar to hide when scrolling the RecyclerView up.

I've also added this to the RecyclerView , but still nothing... app:layout_behavior="@string/appbar_scrolling_view_behavior"

Could someone point out what is missing here?

Toolbar

<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar_events"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#fff"
    android:fitsSystemWindows="true">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar_home_fragment"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#fff"
            app:contentInsetEnd="0dp"
            app:contentInsetLeft="0dp"
            app:contentInsetRight="0dp"
            app:contentInsetStart="0dp"
            app:contentInsetStartWithNavigation="0dp"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerHorizontal="true"
                    android:layout_centerVertical="true"
                    android:fontFamily="@font/scriptbl"
                    android:text="Events"
                    android:textColor="@color/colorBlack"
                    android:textSize="60sp" />

                <ImageView
                    android:id="@+id/search"
                    style="@style/SelectableIconThemeBackground"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentEnd="true"
                    android:layout_centerVertical="true"
                    android:layout_marginEnd="10dp"
                    android:contentDescription="@string/camera"
                    android:padding="10dp"
                    android:src="@drawable/icon_search" />

                <ImageView
                    android:id="@+id/filter"
                    style="@style/SelectableIconThemeBackground"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerVertical="true"
                    android:layout_toStartOf="@+id/search"
                    android:contentDescription="@string/camera"
                    android:padding="10dp"
                    android:src="@drawable/icon10_sort" />

                <ImageView
                    android:id="@+id/options"
                    style="@style/SelectableIconThemeBackground"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentStart="true"
                    android:layout_centerVertical="true"
                    android:layout_marginStart="10dp"
                    android:contentDescription="@string/options"
                    android:padding="10dp"
                    android:src="@drawable/icon_short_text" />

            </RelativeLayout>

        </androidx.appcompat.widget.Toolbar>

    </com.google.android.material.appbar.AppBarLayout>

</androidx.coordinatorlayout.widget.CoordinatorLayout>

TabLayoutFragment

<LinearLayout 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/fragment_home_tab_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:tag="Home"
    tools:context=".Fragment.TabLayoutFragment">

    <include
        android:id="@+id/toolbar_events"
        layout="@layout/toolbar_events" />

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tab_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:background="#fff"
        app:layout_scrollFlags="scroll|enterAlways"
        app:tabIndicatorColor="#000"
        app:tabIndicatorFullWidth="false"
        app:tabRippleColor="@android:color/transparent"
        app:tabSelectedTextColor="@color/colorBlack"
        app:tabTextColor="@color/colorBlack" />

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#fff"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</LinearLayout>

HomeFragment

<RelativeLayout 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/fragment_home"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:orientation="vertical"
    android:tag="fragment_home"
    tools:context=".Fragment.HomeFragment">

    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        android:id="@+id/refresh"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/toolbar">

            <TextView
                android:id="@+id/welcome"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="100dp"
                android:gravity="center"
                android:text="Welcome to Events!"
                android:textColor="#d9d9d9"
                android:textSize="36sp"
                android:visibility="gone" />

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <TextView
                    android:id="@+id/location"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:drawablePadding="5dp"
                    android:gravity="center_horizontal"
                    android:padding="8dp"
                    app:drawableStartCompat="@drawable/icon_loc" />

                <androidx.recyclerview.widget.RecyclerView
                    android:id="@+id/recycler_view"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_below="@+id/location"
                    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

            </RelativeLayout>

            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/recycler_view_following"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:visibility="gone"
                app:layout_behavior="@string/appbar_scrolling_view_behavior" />

        </RelativeLayout>

    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

</RelativeLayout>

Answer 1

You can make it programmatically by adding the addOnScrollListener method.

On the RecyclerView.SCROLL_STATE_DRAGGING method hide the toolbar and TabLayout and on RecyclerView.SCROLL_STATE_IDLE method you can show it again if you want to show them again.

You can try it in such way:

recyclerview.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
    if (newState == RecyclerView.SCROLL_STATE_IDLE) {
        // Show your view again.. If you want to show them..
    } else if (newState == RecyclerView.SCROLL_STATE_DRAGGING) {
        // Hide your view..
    }

    super.onScrollStateChanged(recyclerView, newState);

}});

Or You can use recycler view's addOnScrollListener method:

Refer: addOnScrollListener

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    if (dy > 0) {
        //Scrolling down
        // Show your controllers from here
    } else if (dy < 0) {
        //Scrolling up
        // Hide your controllers from here
    }
}});

Also, you can add some animations there to show and hide your toolbar and tab layouts.

Answer 2

Place the toolbar and the tablayout within the ScrollView group to get the scrolling part.

<ScrollView>
   <Toolbar></Toolbar>
   <Tablayout></Tablayout>
</ScrollView>