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BottomNavigationView not hide on scrollview

iam new to android,please help me.
i want to hide bottom navigation bar so i am using bottom navigation behavior,
i have a scrollview when i scroll the bottomnavigationbar scrolls, i dosent hide please help me
morethan a week am trying to solve this issue please help me
MainActivity.java
mBottomNavigationView=findViewById(R.id.bottom_nav);
mBottomNavigationView = (BottomNavigationView) findViewById(R.id.bottom_nav);
CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) mBottomNavigationView.getLayoutParams();
layoutParams.setBehavior(new BottomNavigationViewBehavior());
bottomNavigationView.setOnNavigationItemSelectedListener(
new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.bottombaritem_map:
........
......
return true;
}
return false;
}
});
}
BottomNavigationViewBehavior
public class BottomNavigationViewBehavior extends CoordinatorLayout.Behavior<BottomNavigationView> {
private int height;
#Override
public boolean onLayoutChild(CoordinatorLayout parent, BottomNavigationView child, int layoutDirection) {
height = child.getHeight();
return super.onLayoutChild(parent, child, layoutDirection);
}
#Override
public boolean onStartNestedScroll(#NonNull CoordinatorLayout coordinatorLayout,
BottomNavigationView child, #NonNull
View directTargetChild, #NonNull View target,
int axes, int type)
{
return axes == ViewCompat.SCROLL_AXIS_VERTICAL;
}
#Override
public void onNestedScroll(#NonNull CoordinatorLayout coordinatorLayout, #NonNull BottomNavigationView child,
#NonNull View target, int dxConsumed, int dyConsumed,
int dxUnconsumed, int dyUnconsumed,
#ViewCompat.NestedScrollType int type)
{
if (dyConsumed > 0) {
slideDown(child);
} else if (dyConsumed < 0) {
slideUp(child);
}
}
private void slideUp(BottomNavigationView child) {
child.clearAnimation();
child.animate().translationY(0).setDuration(200);
}
private void slideDown(BottomNavigationView child) {
child.clearAnimation();
child.animate().translationY(height).setDuration(200);
}
}
Layout xml file
<?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.support.design.widget.CoordinatorLayout
android:id="#+id/coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView 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_book_scrol1"
android:layout_width="fill_parent"
android:visibility="visible"
android:layout_height="fill_parent"
android:fillViewport="true">
...........
..........
</ScrollView>
<!---your RecyclerView/Fragment Container Layout-->
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottom_nav"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:itemBackground="#color/white"
app:menu="#menu/bottombar_menu" />
</android.support.design.widget.CoordinatorLayout>
<!---NavigationView-->
</android.support.v4.widget.DrawerLayout>

BottomNavigationView is not responding to scroll events inside Coordinator Layout

I have an activity in which there is a ViewPager and the BottomNavigationView at the bottom of the page. The ViewPager consists of few fragments in it.
Below is the layout for the activity
<LinearLayout 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:orientation="vertical">
<include layout="#layout/toolbar_with_tab_strip_layout" />
<android.support.design.widget.CoordinatorLayout
android:id="#+id/coordinatorlayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.tf.eros.faythTv.widgets.NonScrollingViewPager
android:id="#+id/home_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottom_navigation_home"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#color/white"
app:elevation="16dp"
app:itemIconTint="#drawable/home_bottombar_icon_color_selector"
app:itemTextColor="#drawable/home_bottombar_icon_color_selector"
app:menu="#menu/bottom_navigation_main" />
</android.support.design.widget.CoordinatorLayout>
</LinearLayout>
And I have also added a BottomNavigationViewBehavior class that will be handling the hiding/unhiding of the BottomNavigationView on scrolling of the fragments in the viewpager
public class BottomNavigationViewBehavior extends CoordinatorLayout.Behavior<BottomNavigationView> {
private int height;
#Override
public boolean onLayoutChild(CoordinatorLayout parent, BottomNavigationView child, int layoutDirection) {
height = child.getHeight();
return super.onLayoutChild(parent, child, layoutDirection);
}
#Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, BottomNavigationView child, View directTargetChild, View target, int nestedScrollAxes) {
return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL;
}
#Override
public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, BottomNavigationView child, View target, int dx, int dy, int[] consumed) {
if (dy > 0) {
slideDown(child);
} else if (dy < 0) {
slideUp(child);
}
}
#Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, BottomNavigationView child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
if (dyConsumed > 0) {
slideDown(child);
} else if (dyConsumed < 0) {
slideUp(child);
}
}
private void slideUp(BottomNavigationView child) {
child.clearAnimation();
child.animate().translationY(0).setDuration(200);
}
private void slideDown(BottomNavigationView child) {
child.clearAnimation();
child.animate().translationY(height).setDuration(200);
}
}
In the Activity I have added these two lines in the onCreate Method
CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) bottomNavigationView.getLayoutParams();
layoutParams.setBehavior(new BottomNavigationViewBehavior());
The aim is to hide the BottomNavigationView when the page is scrolled down(dy > 0) and make it visible when it is scrolled up (dy < 0).
Now the issue with the code is the hiding and unhiding of the BottomNavigationView is not spontaneous with the scrolling. Sometimes it doesn't hide at all while scrolling.

How to hide Floating Action Button on Nested Scroll

I'm trying to hide two FAB on Nested Scroll scrolling. I've tried to implement my own FAB behavior but it did't work. FAB's don't react on scrolling at all. Note: I deleted some part of layout to fit the post.
Layout
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="ru.berezin.maxim.im.budget_v3.userinterface.StartPage">
<android.support.design.widget.AppBarLayout
android:id="#+id/appcollapse"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:id="#+id/testingscroll"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
app:behavior_overlapTop="30dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<!--content including-->
<include layout="#layout/start_content_layout"/>
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.FloatingActionButton
android:id="#+id/start_page_fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="16dp"
android:src="#drawable/plus"
app:layout_anchor="#id/testingscroll"
app:layout_anchorGravity="end|bottom"
app:layout_behavior="ru.berezin.maxim.im.budget_v3.FabOnScroll"
/>
<View
android:id="#+id/dummy"
android:layout_width="1dp"
android:layout_height="16dp"
app:layout_anchor="#id/start_page_fab"
app:layout_anchorGravity="top|right|end"
/>
<android.support.design.widget.FloatingActionButton
android:id="#+id/account_det_add_transfer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|top"
android:layout_margin="16dp"
android:src="#drawable/minus"
app:layout_anchor="#id/dummy"
app:layout_anchorGravity="top|right|end"
app:layout_behavior="ru.berezin.maxim.im.budget_v3.FabOnScroll"
/>
</android.support.design.widget.CoordinatorLayout>
FabOnScroll class
public class FabOnScroll extends FloatingActionButton.Behavior {
public FabOnScroll(Context context, AttributeSet attrs) {
super();
}
#Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
//child -> Floating Action Button
if (dyConsumed > 0) {
CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) child.getLayoutParams();
int fab_bottomMargin = layoutParams.bottomMargin;
child.animate().translationY(child.getHeight() + fab_bottomMargin).setInterpolator(new LinearInterpolator()).start();
} else if (dyConsumed < 0) {
child.animate().translationY(0).setInterpolator(new LinearInterpolator()).start();
}
}
#Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View directTargetChild, View target, int nestedScrollAxes) {
return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL;
}
}

So, I fixed it. Not exactly what I wanted, but it's working. I dont have any ideas why, but for some reason dyConsumed is always equals 0. But I noticed that dyUnconsumed is changing while I scroll. So I've just add dxUnconsumed check to my If/else statment and it's worked. Can someone explain why dyConsumed equals 0?

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener()
{
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy)
{
if (dy > 0 ||dy<0 && fab.isShown())
{
fab.hide();
}
}
#Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState)
{
if (newState == RecyclerView.SCROLL_STATE_IDLE)
{
fab.show();
}
super.onScrollStateChanged(recyclerView, newState);
}
});

I know it's a late answer but my solution is to use dyUnconsumed instead of dyConsumed inside the if statement and it worked very well with me
if (dyUnconsumed > 0 && child.getVisibility() == View.VISIBLE) {
child.hide(new FloatingActionButton.OnVisibilityChangedListener() {
#Override
public void onHidden(FloatingActionButton fab) {
super.onHidden(fab);
child.setVisibility(View.INVISIBLE);
}
});
} else if (dyUnconsumed <0 && child.getVisibility() != View.VISIBLE) {
child.show();
}

How to sync scroll of two CoordinatorLayout + AppBarLayout

I have an activity with XML.
Something like:
<?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"
tools:context=".MainActivity">
<android.support.design.widget.CoordinatorLayout
android:id="#+id/coordinator"
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: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="#color/primary"
android:theme="#style/ToolbarStyle"
android:gravity="center_vertical"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:layout_scrollFlags="scroll|enterAlways|snap"
style="#style/bold" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/TabLayoutStyle"
android:animateLayoutChanges="true"
app:tabGravity="fill"
app:tabMode="fixed"
app:tabTextAppearance="#style/TabStyle"/>
</android.support.design.widget.AppBarLayout>
<com.wedmegood.planner.view.XViewPager
android:id="#+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
...
</android.support.v4.widget.DrawerLayout>
A Fragment of the ViewPager has a CoordinatorLayout and AppBarLayout + CollapsingToolbarLayout.
Fragment's XML:
<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/root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/primaryDark"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapse_toolbar"
android:layout_width="match_parent"
android:layout_height="#dimen/my_wedding_banner_height"
android:minHeight="48dp"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<RelativeLayout
android:id="#+id/banner"
android:layout_width="match_parent"
android:layout_marginTop="0dp"
android:layout_height="match_parent"
app:layout_collapseMode="none">
</RelativeLayout>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="48dp"
android:layout_gravity="bottom"
android:animateLayoutChanges="true"
app:tabMode="fixed"
app:tabGravity="fill"
app:tabTextColor="#color/primary"
app:tabSelectedTextColor="#color/primary"
app:tabIndicatorColor="#color/accent"
app:tabIndicatorHeight="4dp"
app:tabTextAppearance="#style/TabStyle"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<com.wedmegood.planner.view.XViewPager
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>
The fragment has a banner, the RelativeLayout. I want to sync scroll of these two AppBarLayouts so that the outer AppBar collapses either before/after (doesn't matter if it happens before or after) the inside AppBar collapses? I tried setting and unsetting scroll flags of 2 AppBars depending on their Offset change listener, it kinda works but doesn't give a smooth scroll effect. I can change the fragment's XML completely as long as the banner works fine.
Also, is there a way to change style / call TabLayout's setTabTextColors when CollapsingToolbarLayout collapses/expands?

I face the same problem days ago. Finally, I found a solution from SwipeRefreshLayout. Just extend CoordinatorLayout and implement NestedScrollingChild interface. It works!
here is my code:
public class NestedCoordinatorLayout extends CoordinatorLayout implements NestedScrollingChild {
private final NestedScrollingChildHelper mNestedScrollingChildHelper;
private final int[] mParentOffsetInWindow = new int[2];
private final int[] mParentScrollConsumed = new int[2];
public NestedCoordinatorLayout(Context context) {
this(context, null, 0);
}
public NestedCoordinatorLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public NestedCoordinatorLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mNestedScrollingChildHelper = new NestedScrollingChildHelper(this);
setNestedScrollingEnabled(true);
}
// NestedScrollingChild
#Override
public void setNestedScrollingEnabled(boolean enabled) {
mNestedScrollingChildHelper.setNestedScrollingEnabled(enabled);
}
#Override
public boolean isNestedScrollingEnabled() {
return mNestedScrollingChildHelper.isNestedScrollingEnabled();
}
#Override
public boolean startNestedScroll(int axes) {
return mNestedScrollingChildHelper.startNestedScroll(axes);
}
#Override
public void stopNestedScroll() {
mNestedScrollingChildHelper.stopNestedScroll();
}
#Override
public boolean hasNestedScrollingParent() {
return mNestedScrollingChildHelper.hasNestedScrollingParent();
}
#Override
public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed,
int dyUnconsumed, int[] offsetInWindow) {
return mNestedScrollingChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed,
dxUnconsumed, dyUnconsumed, offsetInWindow);
}
#Override
public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) {
return mNestedScrollingChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow);
}
#Override
public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) {
return mNestedScrollingChildHelper.dispatchNestedFling(velocityX, velocityY, consumed);
}
#Override
public boolean dispatchNestedPreFling(float velocityX, float velocityY) {
return mNestedScrollingChildHelper.dispatchNestedPreFling(velocityX, velocityY);
}
#Override
public void onNestedScrollAccepted(View child, View target, int axes) {
super.onNestedScrollAccepted(child, target, axes);
// Dispatch up to the nested parent
startNestedScroll(axes & ViewCompat.SCROLL_AXIS_VERTICAL);
}
#Override
public void onStopNestedScroll(View target) {
super.onStopNestedScroll(target);
stopNestedScroll();
}
#Override
public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
super.onNestedScroll(target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed,
mParentOffsetInWindow);
}
#Override
public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
super.onNestedPreScroll(target, dx, dy, consumed);
final int[] parentConsumed = mParentScrollConsumed;
if (dispatchNestedPreScroll(dx - consumed[0], dy - consumed[1], parentConsumed, null)) {
consumed[0] += parentConsumed[0];
consumed[1] += parentConsumed[1];
}
}
}
Use it in your fragment's layout (Inner coordinator layout).

How can I sync scroll of these 2 AppBarLayouts so that the outer
appbar collapses either before/after (doesn't matter if it happens
before or after) the inside appbar collapses?
Delete that Fragment's CoordinatorLayout and just use RelativeLayout as a root tag (for Fragment)and then do your stuffs with that ViewPager in the MainActivity.
For example, use it inside that CoordinatorLayout like this:
<CoordinatorLayout>
<android.support.v4.view.ViewPager/>
<AppbarLayout/>
<scrollableView/>
<FloatingActionButton/>
</CoordinatorLayout>
Github example:
https://github.com/TheLittleNaruto/SupportDesignExample
Or perhaps you want to scroll that ViewPager inside the NestedScrollView but, you'll face a problem then use the following code inside it:
app:layout_behavior="#string/appbar_scrolling_view_behavior"
That's pretty much it.
A fragment of the ViewPager has a CoordinatorLayout and
AppBarLayout+CollapsingToolbarLayout. XML:
You don't need to use them twice.

FAB has weird gap after add custom Coordinator Behavior on Pre-Lollipop

I am working with new FloatingActionButton and CoordinatorLayout in design support library. When I try to add custom Coordinator Behavior on FloatActionButton it work perfect on Lollipop+, but on Pre-Lollipop there are some weird gap margin on FloatActionButton
My main activity 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:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_height="wrap_content"
android:layout_width="match_parent">
<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" />
</android.support.design.widget.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"
android:paddingBottom="16dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</RelativeLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="16dp"
android:src="#android:drawable/ic_dialog_email"
app:layout_behavior="com.test.fabdemo.FloatingActionButtonBehavior" />
</android.support.design.widget.CoordinatorLayout>
with custom CoordinatorLayout behavior
public class FloatingActionButtonBehavior extends CoordinatorLayout.Behavior<FloatingActionButton> {
public FloatingActionButtonBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
#Override
public boolean layoutDependsOn(CoordinatorLayout parent, FloatingActionButton button, View dependency) {
return dependency instanceof AppBarLayout;
}
#Override
public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton floatingActionButton, View dependency) {
if (dependency instanceof AppBarLayout) {
AppBarLayout appBarLayout = (AppBarLayout) dependency;
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) floatingActionButton.getLayoutParams();
int bottomMargin = lp.bottomMargin;
int distanceToScroll = floatingActionButton.getHeight() + bottomMargin;
float ratio = ViewCompat.getY(appBarLayout) / (float) appBarLayout.getTotalScrollRange();
ViewCompat.setTranslationY(floatingActionButton, -distanceToScroll * ratio);
return true;
}
return false;
}
}
Result in emulator 4.0.3 with and without behavior

After some research I found out that FAB's margin is managed by default Behavior, so make custom Behavior inherit from FloatActionButton.Behavior will solve the problem
public class FloatingActionButtonBehavior extends FloatingActionButton.Behavior {
public FloatingActionButtonBehavior(Context context, AttributeSet attrs) {
super();
}
#Override
public boolean layoutDependsOn(CoordinatorLayout parent, FloatingActionButton button, View dependency) {
return dependency instanceof AppBarLayout || super.layoutDependsOn(parent, button, dependency);
}
#Override
public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton floatingActionButton, View dependency) {
if (dependency instanceof AppBarLayout) {
AppBarLayout appBarLayout = (AppBarLayout) dependency;
CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) floatingActionButton.getLayoutParams();
int bottomMargin = lp.bottomMargin;
int distanceToScroll = floatingActionButton.getHeight() + bottomMargin;
float ratio = ViewCompat.getY(appBarLayout) / (float) appBarLayout.getTotalScrollRange();
ViewCompat.setTranslationY(floatingActionButton, -distanceToScroll * ratio);
return true;
}
return super.onDependentViewChanged(parent, floatingActionButton, dependency);
}
}