I have implemented show and hide functionality for toolbar and bottomNavigationView while scrolling up and down in recyclerView.
Now i click on recyclerView item and go to detail page which does not have recyclerView, now also toolbar and bottomNavigationView are hidden. Any method to make them visible again in this fragment.
main_activity.xml
<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:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/tool_bar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:elevation="5dp"
android:theme="#style/ToolbarTheme"
app:layout_scrollFlags="scroll|enterAlways"
app:titleTextAppearance="#style/Toolbar.TitleText" />
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
<com.ittianyu.bottomnavigationviewex.BottomNavigationViewEx
android:id="#+id/bottom_navigation_bar"
android:layout_width="match_parent"
android:layout_height="56dp"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom"
android:background="#drawable/menu_view"
android:isScrollContainer="false"
app:itemIconTint="#drawable/nav_item_color_state"
app:menu="#menu/my_navigation_items" />
BottomNavigationViewBehaviour.java
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 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(50);
}
private void slideDown(BottomNavigationView child) {
child.clearAnimation();
child.animate().translationY(height).setDuration(50);
}
}
MainActivity.java
CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) mBottomNav.getLayoutParams();
layoutParams.setBehavior(new BottomNavigationViewBehavior());
mBottomNav.clearAnimation();
mBottomNav.animate().translationY(mBottomNav.getHeight()).setDuration(100);
you can use AppbarLayout to expand using appbarLayout.setExpand(true) but this only show your action bar not your bottomNavigationbar.
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.
I have made an Android app with a recyclerview and a floating action button. When scrolling down, the button should hide, when scrolling up it should show again. I have used this tutorial to implement the behavior.
The result is, that the FAB hides when I scroll down, but when scrolling up it does not reappear again :( The class ScrollAwareFABBehavior is identical from the tutorial. But I'm using nested layouts.
Here is my layout (the recyclerview is in a LinearLayout in content_main):
<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="org.myorganisation.mypackage.someActivity">
<include layout="#layout/toolbar" />
<include layout="#layout/content_main" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/add_fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
android:src="#drawable/plus"
app:layout_behavior="org.myorganisation.mypackage.someActivity.helpers.ScrollAwareFABBehavior" />
<LinearLayout
android:id="#+id/insert_alert"
android:layout_width="wrap_content"
android:layout_height="50sp"
android:layout_margin="#dimen/fab_margin"
android:gravity="center_vertical"
android:orientation="horizontal"
android:paddingEnd="70sp"
android:visibility="gone"
app:layout_anchor="#id/add_fab"
app:layout_anchorGravity="bottom|left">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:text="#string/initial_alert"
android:textColor="#color/colorPrimaryDark"
android:textStyle="bold|italic" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_keyboard_arrow_right_black_24sp"
android:tint="#color/colorPrimary" />
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
As of version 25.1.0 of the Support Library, hidden views no longer scroll events as per this bug.
As mentioned in comment #5:
This is working as intended, your dependency chain is the wrong way. Your RecyclerView (Behavior) should be triggering the FAB visibility change.
As for support library version 25.1.0, the solution is here.
Here is simple solution:
The concept behind this is very simple, you just need to detect when user scrolls down and up the RecyclerView. In Android there are some built in methods that can help us detect when user is scrolling either side in Recyclerview. See the code below, since it will show the full concept:
RecyclerView rv = (RecyclerView)findViewById(R.id.rv);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
rv.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (dy < 0) {
fab.show();
} else if (dy > 0) {
fab.hide();
}
}
});
I solved this problem by replacing
.setVisibility(View.VISIBLE) with .show(true) and
.setVisibility(View.GONE) with .hide(true):
And here is my class for the Behaviour, that works with 25.1.0: and Clans FloatingActionButton
public class ScrollAwareFABBehavior extends CoordinatorLayout.Behavior<FloatingActionButton> {
private static boolean mIsAnimatingOut = false;
private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
public ScrollAwareFABBehavior(Context context, AttributeSet attrs) {
super();
}
#Override
public boolean layoutDependsOn(CoordinatorLayout parent, FloatingActionButton fabButton, View dependency) {
return dependency instanceof Snackbar.SnackbarLayout;
}
#Override
public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton fabButton, View dependency) {
float translationY = Math.min(0, dependency.getTranslationY() - dependency.getHeight());
fabButton.setTranslationY(translationY);
return true;
}
#Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout,
FloatingActionButton fabButton, View directTargetChild, View target, int nestedScrollAxes) {
return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL ||
super.onStartNestedScroll(coordinatorLayout, fabButton, directTargetChild, target,
nestedScrollAxes);
}
#Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton fabButton,
View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
super.onNestedScroll(coordinatorLayout, fabButton, target, dxConsumed, dyConsumed, dxUnconsumed,
dyUnconsumed);
if (fabButton.isEnabled()) {
if (dyConsumed > 0 && !mIsAnimatingOut && fabButton.isShown()) {
animateOut(fabButton);
} else if ((dyConsumed < 0 || dyUnconsumed < 0) && fabButton.isHidden()) {
animateIn(fabButton);
}
}
}
public static void animateOut(final FloatingActionButton fabButton) {
if (Build.VERSION.SDK_INT >= 14) {
ViewCompat.animate(fabButton).translationY(168F).alpha(0.0F).setInterpolator(INTERPOLATOR).withLayer()
.setListener(new ViewPropertyAnimatorListener() {
public void onAnimationStart(View view) {
mIsAnimatingOut = true;
}
public void onAnimationCancel(View view) {
mIsAnimatingOut = false;
}
public void onAnimationEnd(View view) {
mIsAnimatingOut = false;
fabButton.hide(true);
}
}).start();
} else {
Animation anim = AnimationUtils.loadAnimation(fabButton.getContext(), android.R.anim.fade_in);
anim.setInterpolator(INTERPOLATOR);
anim.setDuration(200L);
anim.setAnimationListener(new Animation.AnimationListener() {
public void onAnimationStart(Animation animation) {
mIsAnimatingOut = true;
}
public void onAnimationEnd(Animation animation) {
mIsAnimatingOut = false;
fabButton.hide(true);
}
#Override
public void onAnimationRepeat(final Animation animation) {
}
});
fabButton.startAnimation(anim);
}
}
public static void animateIn(FloatingActionButton fabButton) {
fabButton.show(true);
if (Build.VERSION.SDK_INT >= 14) {
ViewCompat.animate(fabButton).translationY(0).scaleX(1.0F).scaleY(1.0F).alpha(1.0F)
.setInterpolator(INTERPOLATOR).withLayer().setListener(null)
.start();
} else {
Animation anim = AnimationUtils.loadAnimation(fabButton.getContext(), android.R.anim.fade_out);
anim.setDuration(200L);
anim.setInterpolator(INTERPOLATOR);
fabButton.startAnimation(anim);
}
}
}
I am trying to hide and show a view when my recyclerview scrolls with the help of coordinator layout.
My view is a linearlayout with button and it is not a fab, toolbar or tablayout as I already know how to hide them on scroll.
Please note this is not a duplicate as all answers show how to fab toolbar or tablayout
This is xml i am using
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/prodMain"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/transparent"
android:orientation="vertical"
xmlns:app="http://schemas.android.com/apk/res-auto">
<RelativeLayout
android:id="#+id/LinearLayout01"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/gray_light"
android:orientation="vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp">
<LinearLayout
android:id="#+id/linearFilterLayout"
android:layout_width="match_parent"
app:layout_behavior="fc.admin.fcexpressadmin.itemdecorators.FABFloatOnScroll"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/margin10dp"
android:background="#color/white"
android:orientation="horizontal"
android:padding="#dimen/margin10dp"
android:visibility="visible"
android:weightSum="3">
</LinearLayout>
<ViewFlipper
android:id="#+id/ViewFlipper01"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/linearFilterLayout"
android:layout_marginBottom="#dimen/margin10dp"
android:layout_marginTop="#dimen/margin6dp"
android:background="#color/gray_light"
android:visibility="visible">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="#+id/btnFooterRefresh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="5dp"
android:text="Refresh"
android:visibility="visible"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/gridview"
android:layout_width="match_parent"
android:clipToPadding="false"
android:layout_height="match_parent"
android:layout_above="#+id/btnFooterRefresh"
android:cacheColorHint="#android:color/transparent"
android:listSelector="#android:color/transparent"
android:scrollbars="vertical"
android:scrollingCache="false"
android:visibility="visible"/>
</RelativeLayout>
</ViewFlipper>
</RelativeLayout>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
and this is code of my custom behaviour:
public class FABFloatOnScroll extends CoordinatorLayout.Behavior {
private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
private int mDySinceDirectionChange=0;
public FABFloatOnScroll() {
super();
}
public FABFloatOnScroll(Context context, AttributeSet attrs) {
super(context, attrs);
}
#Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
Log.e("scroll", "dependent on views");
return dependency instanceof LinearLayout;
}
#Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
// Adjust the child View accordingly
Log.e("scroll","dependent");
return true;
}
#Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
Log.e("scroll","called");
//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 void onNestedPreScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dx, int dy, int[] consumed) {
if (dy > 0 && mDySinceDirectionChange < 0
|| dy < 0 && mDySinceDirectionChange > 0) {
mDySinceDirectionChange = 0;
}
mDySinceDirectionChange += dy;
if (mDySinceDirectionChange > child.getHeight()
&& child.getVisibility() == View.VISIBLE) {
hide(child);
} else if (mDySinceDirectionChange < 0
&& child.getVisibility() == View.GONE) {
show(child);
}
}
#Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, View child, View directTargetChild, View target, int nestedScrollAxes) {
return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL;
}
private void hide(final View view) {
view.animate()
.translationY(view.getHeight())
.setInterpolator(INTERPOLATOR)
.setDuration(200)
.setListener(new Animator.AnimatorListener() {
#Override
public void onAnimationStart(Animator animator) {
}
#Override
public void onAnimationEnd(Animator animator) {
// Prevent drawing the View after it is gone
view.setVisibility(View.GONE);
}
#Override
public void onAnimationCancel(Animator animator) {
// Canceling a hide should show the view
show(view);
}
#Override
public void onAnimationRepeat(Animator animator) {
}
})
.start();
}
private void show(final View view) {
view.animate()
.translationY(0)
.setInterpolator(INTERPOLATOR)
.setDuration(200)
.setListener(new Animator.AnimatorListener() {
#Override
public void onAnimationStart(Animator animator) {
}
#Override
public void onAnimationEnd(Animator animator) {
// Prevent drawing the View after it is gone
view.setVisibility(View.VISIBLE);
}
#Override
public void onAnimationCancel(Animator animator) {
// Canceling a hide should show the view
hide(view);
}
#Override
public void onAnimationRepeat(Animator animator) {
}
})
.start();
}
}
But the problem is the custom behaviour class is not calling no logs are printed whatsoever
A Behavior can be effective only when associated to a direct child of a CoordinatorLayout.
Im using the FloatingActionButton from the android.support.design.widget package:
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_marginBottom="20dp"
android:layout_marginEnd="16dp"
android:clickable="true"
android:backgroundTint="#color/primaryColor"
android:src="#drawable/ic_search_white_24dp"
app:borderWidth="0dp"
app:elevation="6dp"
app:backgroundTint="#color/primaryColorDark"
app:rippleColor="#color/accentColor" />
Is it possible to configure that button to hide with an animation when the listview is scrolling down and to show it again when listview is scrolling up to the top?
Those who are looking to make it with recyclerview can do this:
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);
}
});
Sorry! I am late by years to answer this. I hope this still helps someone. This is also my first answer.
Mates! No need to implement scroll listeners.
Add the following to the floating action button xml:
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
giving:
<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
android:id="#+id/fabAddOItransferIn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
android:text="#string/btn_text_transfer_in"
app:icon="#android:drawable/ic_input_add"
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toRightOf="parent" />
In response to the following comment of mine,
"Sorry! I just noticed this has a weird side effect. Any snackbars will overlap this floating action button if app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior is added. ☹️ Taking this line off will prevent the overlap and the floating action button will behave as it is intended to inside the coordinator layout. "
To counter this, do use the following:
Snackbar.make(floating_action_button, "Some snackbar text!", BaseTransientBottomBar.LENGTH_SHORT).setAnchorView(floating_action_button).show();
A small improvement to the code from Irfan Raza:
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener(){
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy){
if (dy<0 && !fab.isShown())
fab.show();
else if(dy>0 && fab.isShown())
fab.hide();
}
#Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
});
The Floating Action Button hides when scrolling down and shows when scrolling up.
See this. Here it tells how to do what you are trying to achieve. You have to use it like this in a CoordinatorLayout and ListView :
<android.support.design.widget.CoordinatorLayout
android:id="#+id/main_content"
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">
<ListView
android:id="#+id/lvToDoList"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="16dp"
android:src="#drawable/ic_done"
app:layout_anchor="#id/lvToDoList"
app:layout_anchorGravity="bottom|right|end" />
</android.support.design.widget.CoordinatorLayout>
using this class you can easily animate you FAB, here I have implemented onStopNestedScroll() method to show your Fab whenever scroll stop.
I set 1000 miliSeconds as delay using Handler();
public class FabBehaviour extends CoordinatorLayout.Behavior<FloatingActionButton> {
private static final String TAG = "ScrollingFABBehavior";
Handler mHandler;
public FabBehaviour(Context context, AttributeSet attrs) {
super();
}
public FabBehaviour() {
super();
}
#Override
public void onStopNestedScroll(#NonNull CoordinatorLayout coordinatorLayout, #NonNull final FloatingActionButton child, #NonNull View target, int type) {
super.onStopNestedScroll(coordinatorLayout, child, target, type);
if (mHandler == null)
mHandler = new Handler();
mHandler.postDelayed(new Runnable() {
#Override
public void run() {
child.animate().translationY(0).setInterpolator(new LinearInterpolator()).start();
Log.d("FabAnim", "startHandler()");
}
}, 1000);
}
#Override
public void onNestedScroll(#NonNull CoordinatorLayout coordinatorLayout, #NonNull FloatingActionButton child, #NonNull View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int type) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, type);
if (dyConsumed > 0) {
Log.d("Scrolling", "Up");
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) {
Log.d("Scrolling", "down");
child.animate().translationY(0).setInterpolator(new LinearInterpolator()).start();
}
}
#Override
public boolean onStartNestedScroll(#NonNull CoordinatorLayout coordinatorLayout, #NonNull FloatingActionButton child, #NonNull View directTargetChild, #NonNull View target, int axes, int type) {
if (mHandler != null) {
mHandler.removeMessages(0);
Log.d("Scrolling", "stopHandler()");
}
return axes == ViewCompat.SCROLL_AXIS_VERTICAL;
}
}
your_layout.xml
<android.support.design.widget.FloatingActionButton
android:id="#+id/imageViewYes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end|right"
android:layout_margin="#dimen/fab_margin"
android:src="#drawable/ic_yes"
app:backgroundTint="#color/white"
android:scaleType="center"
app:elevation="6dp"
app:fabSize="normal"
app:layout_behavior="com.your.package.FabBehaviour"
app:pressedTranslationZ="12dp"
app:rippleColor="#color/gray" />
hey there is o require to take the recyclerview for auto hiding the floating action button on scrolling down for this purpose we can use default listview with floating action button in normal way only make modifications on listview.onscroll listener then we can get feel like recycle
listview.setOnScrollListener(new AbsListView.OnScrollListener() {
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
#Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
int lastItem = firstVisibleItem + visibleItemCount;
if (lastItem == totalItemCount) {
fab.setVisibility(View.INVISIBLE);
}else {
fab.setVisibility(View.VISIBLE);
}
}
});
There is my code in kotlin.
class ScrollAwareFABBehavior (val recyclerView: RecyclerView, val floatingActionButton: FloatingActionButton) {
fun start() {
recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
if (dy > 0) {
if (floatingActionButton!!.isShown) {
floatingActionButton?.hide()
}
} else if (dy < 0) {
if (!floatingActionButton!!.isShown) {
floatingActionButton?.show()
}
}
}
})
}
}
Now, you just need to call the ScrollAwareFABBehavior with the recyclerView and the fab on constructor, then call method start().
ScrollAwareFABBehavior(recyclerView = recyclerViewPlaceFormContainer, floatingActionButton = floatingActionButton).start()
Another method for recycleView using kotlin extensions.
fun RecyclerView.attachFab(fab : FloatingActionButton) {
this.addOnScrollListener(object : RecyclerView.OnScrollListener(){
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
if (dy > 0)
fab.hide()
else if (dy < 0)
fab.show()
}
})
}
Now you can attach fab to any recycleView with:
rv.attachFab(requireActivity().fab)
// in my case i made fab public on activity
Here I am adding extra padding for last view item to avoid overlapping list item with floating action button
I used this in a RecyclerView.Adapter's onBindViewHolder method to set the bottom margin of the last item in the list to 72dp so that it will scroll up above the floating action button.
This does not require a dummy entry in the list.
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
// other binding code goes here.
if (position + 1 == getItemCount()) {
// set bottom margin to 72dp.
setBottomMargin(holder.itemView, (int) (72 * Resources.getSystem().getDisplayMetrics().density));
} else {
// reset bottom margin back to zero. (your value may be different)
setBottomMargin(holder.itemView, 0);
}
}
public static void setBottomMargin(View view, int bottomMargin) {
if (view.getLayoutParams() instanceof ViewGroup.MarginLayoutParams) {
ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) view.getLayoutParams();
params.setMargins(params.leftMargin, params.topMargin, params.rightMargin, bottomMargin);
view.requestLayout();
}
}
Kotlin + DataBinding Adapter
#BindingAdapter("bindAdapter:attachFloatingButton")
fun bindRecyclerViewWithFB(recyclerView: RecyclerView, fb: FloatingActionButton) {
recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
if (dy > 0 && fb.isShown) {
fb.hide()
} else if (dy < 0 && !fb.isShown) {
fb.show()
}
}
})
}
and the xml
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/main_recyclerview"
android:layout_width="match_parent"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
android:layout_height="wrap_content"
android:clipToPadding="false"
android:paddingBottom="8dp" app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="#+id/main_chips"
android:layout_marginBottom="8dp"
**bindAdapter:attachFloatingButton="#{mainFb}"**
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.0"/>
<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
android:id="#+id/main_fb"
android:layout_width="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
style="#style/Widget.Design.FloatingActionButton"
app:layout_constraintEnd_toEndOf="parent"
android:layout_height="wrap_content"
android:layout_margin="18dp"
android:background="#color/colorPrimaryDark"
app:icon="#drawable/ic_add_black_24dp"/>
According to me the best way to implement this would be as below.
public class ScrollingFABBehavior extends FloatingActionButton.Behavior {
private static final String TAG = "ScrollingFABBehavior";
public ScrollingFABBehavior(Context context, AttributeSet attrs) {
super();
// Log.e(TAG, "ScrollAwareFABBehavior");
}
public boolean onStartNestedScroll(CoordinatorLayout parent, FloatingActionButton child, View directTargetChild, View target, int nestedScrollAxes) {
return true;
}
#Override
public boolean layoutDependsOn(CoordinatorLayout parent, FloatingActionButton child, View dependency) {
if (dependency instanceof RecyclerView)
return true;
return false;
}
#Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout,
FloatingActionButton child, View target, int dxConsumed,
int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
// TODO Auto-generated method stub
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed,
dxUnconsumed, dyUnconsumed);
//Log.e(TAG, "onNestedScroll called");
if (dyConsumed > 0 && child.getVisibility() == View.VISIBLE) {
// Log.e(TAG, "child.hide()");
child.hide();
} else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {
// Log.e(TAG, "child.show()");
child.show();
}
}}
For detailed answer check this out. Hide FloatingActionButton on scroll of RecyclerView
for Kotlin it is very simple (API 23+)
myRecyclerView.setOnScrollChangeListener { _, _, _, _, oldScrollY ->
if (oldScrollY < 0) myFAB.hide() else myFAB.show()
}
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (dy > 0 && mFloatingActionButton.getVisibility() == View.VISIBLE) {
mFloatingActionButton.hide();
} else if (dy < 0 && mFloatingActionButton.getVisibility() != View.VISIBLE) {
mFloatingActionButton.show();
}
}});
Just to add, for NestedScrollView the approach will be something like the following:
// register the extended floating action Button
final ExtendedFloatingActionButton extendedFloatingActionButton = findViewById(R.id.extFloatingActionButton);
// register the nestedScrollView from the main layout
NestedScrollView nestedScrollView = findViewById(R.id.nestedScrollView);
// handle the nestedScrollView behaviour with OnScrollChangeListener
// to extend or shrink the Extended Floating Action Button
nestedScrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
#Override
public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
// the delay of the extension of the FAB is set for 12 items
if (scrollY > oldScrollY + 12 && extendedFloatingActionButton.isExtended()) {
extendedFloatingActionButton.shrink();
}
// the delay of the extension of the FAB is set for 12 items
if (scrollY < oldScrollY - 12 && !extendedFloatingActionButton.isExtended()) {
extendedFloatingActionButton.extend();
}
// if the nestedScrollView is at the first item of the list then the
// extended floating action should be in extended state
if (scrollY == 0) {
extendedFloatingActionButton.extend();
}
}
});
I've taken this code from GeeksForGeeks