hide actionBar on Swipe vertical viewPager

I’m trying to hide My ActionBar/toolbar on Swipe using a vertical ViewPager, this is my MainActivity XML:

 <android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:ignore="InconsistentLayout">

    <android.support.design.widget.CoordinatorLayout
        android:id="@+id/coordinator_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/appbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fitsSystemWindows="true">

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

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

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

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

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

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

I added to my toolbar : app:layout_scrollFlags=”scroll|enterAlways”

i have only Blank page in my Fragment, the ViewPager not visible:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:isScrollContainer="false"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
android:background="@color/greeen_theme"
android:clipToPadding="false"
app:layout_behavior="@string/appbar_scrolling_view_behavior">

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:background="@color/light_theme_color_read"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

<Button
    android:id="@+id/refreshListBtn"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="5dp"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="10dp"
    android:background="@drawable/bg_refresh_list_button_selector"
    android:textColor="@android:color/white"
    android:visibility="visible"/>

<com.axample.android.view.SwipeRefreshLayout
    android:id="@+id/swiperefresh"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

        <com.axample.android.adapter.vertical.VerticalViewPager
            android:id="@+id/viewpager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:paddingBottom="@dimen/pager_padd_botom"
            android:clipToPadding="false"/>

</com.axample.android.view.SwipeRefreshLayout>

</RelativeLayout>

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

video : https://www.youtube.com/watch?v=sWknAZFs6RA

Please Help!!

Update : my view_left_drawer.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:tools="http://schemas.android.com/tools"
         android:id="@+id/left_drawer"
         android:layout_width="240dp"
         android:layout_height="match_parent"
         android:layout_gravity="start"
         android:background="@color/black_main"
         tools:showIn="@layout/activity_home">

<include layout="@layout/view_drawer_content"/>
</FrameLayout>

my SwipeRefreshLayout: https://github.com/FredJul/Flym/blob/master/Flym/src/main/java/net/fred/feedex/view/SwipeRefreshLayout.java

Problem with SwipeRefreshLayout, It should be on top of NestedScrollView Layout.

<android.support.v4.widget.SwipeRefreshLayout

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

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

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="end"
    tools:ignore="InconsistentLayout">

    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="end"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />

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

app_bar_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.sample.MainActivity"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay"
        android:layoutDirection="rtl">

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

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

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

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

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/swiperefreshlayout"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <android.support.v4.widget.NestedScrollView
        android:isScrollContainer="false"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorPrimary"
        android:clipToPadding="false"
        tools:context=".MainActivity"
        android:fillViewport="true"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <RelativeLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:background="@color/colorAccent"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <Button
                android:id="@+id/refreshListBtn"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:layout_marginRight="10dp"
                android:layout_marginTop="10dp"
                android:background="@drawable/flat_selector"
                android:textColor="@android:color/white"
                android:visibility="visible"/>
            <TextView
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:text="Add Your ViewPager Instead of TextView"
                android:layout_below="@+id/refreshListBtn"
                android:layout_alignParentTop="true"
                android:layout_alignParentBottom="true"
                android:textColor="#FFFFFF"
                android:gravity="center"/>


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

Normally I use this piece of code (see below). But this is prepared for another type of layout. You can try to adapt it to your layout.

 public static class ShowHideToolbarOnScrollingListener implements MyNestedScrollView.ScrollViewListener{

    private Toolbar toolbar;
    private State state;
    private float toolbarElevation;

    public ShowHideToolbarOnScrollingListener(Toolbar toolbar, float toolbarElevation) {
        this.toolbar = toolbar;
        this.state = new State();
        this.toolbarElevation = toolbarElevation;
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void toolbarSetElevation(float elevation) {
        if (AndroidUtils.isLollipop()) {
            toolbar.setElevation(elevation == 0 ? 1 : toolbarElevation);
        }
    }

    private void toolbarAnimateShow(final int verticalOffset) {
        toolbar.animate()
                .translationY(0)
                .setInterpolator(new LinearInterpolator())
                .setDuration(180)
                .setListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationStart(Animator animation) {
                        toolbarSetElevation(verticalOffset == 0 ? 1 : toolbarElevation);
                    }
                });
    }

    private void toolbarAnimateHide() {
        toolbar.animate()
                .translationY(-toolbar.getHeight())
                .setInterpolator(new LinearInterpolator())
                .setDuration(180)
                .setListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationEnd(Animator animation) {
                        toolbarSetElevation(1);
                    }
                });
    }




    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public void onRestoreInstanceState(State state) {
        this.state.verticalOffset = state.verticalOffset;
        this.state.scrollingOffset = state.scrollingOffset;
        if (AndroidUtils.isLollipop()) {
            toolbar.setElevation(state.elevation);
            toolbar.setTranslationY(state.translationY);
        }
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public State onSaveInstanceState() {
        state.translationY = toolbar.getTranslationY();
        if (AndroidUtils.isLollipop()) {
            state.elevation = toolbar.getElevation();
        }
        return state;
    }



    @Override
    public void onScrollChanged(MyNestedScrollView v, int x, int y, int oldx, int oldy) {
        int dy = y-oldy;
        Log.d("dy", ""+dy);
        state.verticalOffset = v.computeVerticalScrollOffset();
        state.scrollingOffset = dy;
        int toolbarYOffset = (int) (dy - toolbar.getTranslationY());
        toolbar.animate().cancel();
        if (state.scrollingOffset > 0) {
            if (toolbarYOffset < toolbar.getHeight()) {
                if (state.verticalOffset > toolbar.getHeight()) {
                    toolbarSetElevation(toolbarElevation);
                }
                toolbar.setTranslationY(state.translationY = -toolbarYOffset);
            } else {
                toolbarSetElevation(1);
                toolbar.setTranslationY(state.translationY = -toolbar.getHeight());
            }
        } else if (state.scrollingOffset < 0) {
            if (toolbarYOffset < 0) {
                if (state.verticalOffset <= 0) {
                    toolbarSetElevation(1);
                }
                toolbar.setTranslationY(state.translationY = 0);
            } else {
                if (state.verticalOffset > toolbar.getHeight()) {
                    toolbarSetElevation(toolbarElevation);
                }
                toolbar.setTranslationY(state.translationY = -toolbarYOffset);
            }
        }
    }

    @Override
    public void onEndScroll() {
        if (state.scrollingOffset > 0) {
            if (state.verticalOffset > toolbar.getHeight()) {
                toolbarAnimateHide();
            } else {
                toolbarAnimateShow(state.verticalOffset);
            }
        } else if (state.scrollingOffset < 0) {
            if (toolbar.getTranslationY() < toolbar.getHeight() * -0.6 && state.verticalOffset > toolbar.getHeight()) {
                toolbarAnimateHide();
            } else {
                toolbarAnimateShow(state.verticalOffset);
            }
        }
    }


    /**
     * Parcelable RecyclerView/Toolbar state for simpler saving/restoring its current state.
     */
    public static final class State implements Parcelable {
        public static Creator<State> CREATOR = new Creator<State>() {
            public State createFromParcel(Parcel parcel) {
                return new State(parcel);
            }

            public State[] newArray(int size) {
                return new State[size];
            }
        };

        // Keeps track of the overall vertical offset in the list
        private int verticalOffset;
        // Determines the scroll UP/DOWN offset
        private int scrollingOffset;
        // Toolbar values
        private float translationY;
        private float elevation;

        State() {
        }

        State(Parcel parcel) {
            this.verticalOffset = parcel.readInt();
            this.scrollingOffset = parcel.readInt();
            this.translationY = parcel.readFloat();
            this.elevation = parcel.readFloat();
        }

        @Override
        public int describeContents() {
            return 0;
        }

        @Override
        public void writeToParcel(Parcel parcel, int flags) {
            parcel.writeInt(verticalOffset);
            parcel.writeInt(scrollingOffset);
            parcel.writeFloat(translationY);
            parcel.writeFloat(elevation);
        }
    }
}