Develop Reference

Android how to show toolbar after hiding (by scrolling down in RecyclerView)

I have BottomNavigationView with three fragments. First one has a RecyclerView and I implemented to hide Toolbar after scrolling this RecyclerView and it works. When I change fragment I would like to show it again (actionbar) - but actionbar.isShowing() returns true and actionbar.show() doesn't work. Maybe somebody has an idea?
activity_main.xml
<androidx.coordinatorlayout.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:background="#android:color/white"
tools:context=".main.MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize">
<androidx.appcompat.widget.Toolbar
android:id="#+id/mainToolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|enterAlways|snap"
app:title="#string/app_name"/>
</com.google.android.material.appbar.AppBarLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/mainNav"
android:layout_width="match_parent"
android:layout_height="56dp"
android:background="#android:color/white"
app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior"
app:menu="#menu/user_tabs_menu" />
<FrameLayout
android:id="#+id/mainFrameLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

When you change fragments you should call AppBarLayout.setExpanded(true)

Can you show us some code on how are you making the toolbar disappear?

coordinator layout anchor doesnt work

I can't get the anchor to work. it doesn't follow the app bar being scrolled to the top.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:background="#color/testGray">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_height="200dp"
android:layout_gravity="center_horizontal"
>
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
android:background="?attr/colorPrimary"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/frame_info"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginTop="140dp"
android:elevation="11dp"
android:layout_gravity="center_horizontal"
app:layout_anchor="#id/appbar"
app:layout_anchorGravity="center|bottom"
>
</FrameLayout>
<team.semicolon.amizeh.CustomViews.SongsListView
android:id="#+id/songs_listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintTop_toBottomOf="#id/frame_info"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginTop="60dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
</android.support.design.widget.CoordinatorLayout>
</android.support.constraint.ConstraintLayout>
plus, I can't get the minHeight to work, It scrolls all the way to the top.
I want the frame layout to follow the app bar and anchor it but the app bar scrolls but the frame layout doesn't.

the frame_info doesn't follow the appbar when I scroll, as it was
supposed to do. when I scroll SongsListView to the top, the appbar
moves to the top too, but frame_info stays in place
First of all, i don't suggest such a layout. Like i said, make the CoordinatorLayout as the root of the layout.
Also, if you are trying to achieve FrameLayout follow AppbarLayout when scrolling, you'll need to add it inside a NestedScrollView then setting the NestedScrollView:
app:layout_behavior="#string/appbar_scrolling_view_behavior"
To follow AppbarLayout.
Check my answer about where to using above code : appbar_scrolling_view_behavior https://stackoverflow.com/a/35181870/4409113

Floating Action Button Not In Bottom Right

My FAB for some reason won't go to the bottom right corner of the screen as usual. I'm inside a fragment and that fragment is a coordinator layout (I don't know if this is a good practice or not).
Here is the layout xml code:
<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"
tools:context="com.gigstudios.polls.fragment.MyPollsFragment">
<LinearLayout
android:id="#+id/linear_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
<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="#dimen/fab_margin"
android:src="#drawable/ic_add_white_36dp"
app:fabSize="normal"
app:layout_anchor="#id/linear_layout"
app:layout_anchorGravity="bottom|right|end" />
</android.support.design.widget.CoordinatorLayout>
And for some reason the FAB ends up in the top right instead of the bottom right. Does anyone know what I'm doing wrong?
Btw the xml preview has always shown the fab button in the bottom right corner but when I run it on my phone it's in the top right instead.
Edit: Here's my main_activity xml to show where I'm putting the fragment (The "container" FrameLayout).
<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:background="#color/colorGrey">
<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:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorGrey"
android:layout_marginTop="?attr/actionBarSize">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/container">
</FrameLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

The issue is coming due to android.support.v4.widget.NestedScrollView add one more field android:fillViewport="true". Issue was coming as yourNestedScrollView` was not expanding to match parent or take available space. Working fine tested with my code
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimary"
android:fillViewport="true"
android:layout_marginTop="?attr/actionBarSize">
</android.support.v4.widget.NestedScrollView>

Remove the lines
app:layout_anchor="#id/linear_layout"
app:layout_anchorGravity="bottom|right|end"
on your FloatingActionButton. They aren't doing anything (since you are anchoring to a view that fills the entire CoordinatorLayout). This will cause your layout_gravity to be respected and your FloatingActionButton will be placed in the bottom right corner of the CoordinatorLayout.

Remove the android:layout_gravity="bottom|end" from your floating action button xml code...it will work

How to put RecyclerView below Toolbar and above TabLayout and ViewPager also handling responses to scrolls in a custom manner?

I want to create a layout like the below image:
A CoordinatorLayout which contain :
CollapsingToolbarLayout( contain ImageView & Toolbar)
RecyclerView
TabLayout
ViewPager( that each fragment of it contain a RecyclerView)
I wanna responding to scroll events in this way:
CollapsingToolbarLayout expand and collapse by scrolling
Toolbar sticks to the top until TabLayout reach to the top
After that toolbar scroll up and TabLayout stick to the top
I'm having trouble with the RecyclerView between CollapsingToolbarLayout and TabLayout. I can implement this layout without that RecyclerView( I put CollapsingToolbarLayout and TabLayout inside the AppBarLayout and the ViewPager outside it, inside the CoordinatorLayout).
My Question:
Where should I put that RecyclerView?
Which & where layout_scrollFlags and layout_behavior should I set for each layouts?
It seems that AppBarLayout have a limited height. When I put the RecyclerView inside AppBarLayout, only a portion part of the RecyclerView is visible and also TabLayout disappear.
I read lots of tutorials like this one and lots of questions like this one and this one, but non of them help me.

use this as a main layout
activity_main
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout 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/swipe_refresh_layout_profile"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:ignore="RtlHardcoded">
<android.support.design.widget.CoordinatorLayout
android:id="#+id/co_profile_activity_root_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:visibility="visible">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar_profile"
android:layout_width="match_parent"
android:layout_height="#dimen/profile_img_placeholder_height"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapse_toolbar_profile"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<RelativeLayout
android:id="#+id/rel_top"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop">
<ImageView
android:id="#+id/img_bg_placeholder_profile"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:tint="#11000000"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.9" />
<LinearLayout
android:id="#+id/lin_top_inner"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#BF473e6b"
android:orientation="vertical"
android:scaleType="centerCrop">
</LinearLayout>
</RelativeLayout>
<FrameLayout
android:id="#+id/frame_detail_profile"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center|center_horizontal"
android:orientation="vertical"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.3">
<android.support.v7.widget.RecyclerView
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</FrameLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_profile"
android:layout_width="match_parent"
android:layout_height="#dimen/profile_toolbar_height"
android:gravity="top|center"
app:layout_anchor="#id/frame_detail_profile"
app:layout_collapseMode="pin"
app:theme="#style/ThemeOverlay.AppCompat.Dark"
app:title="">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="#+id/tv_toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/profile_toolbar_title_left_margin"
android:gravity="center_vertical|center"
android:ellipsize="end"
android:singleLine="true"
android:layout_gravity="center"
android:textColor="#android:color/white"
android:textSize="20sp" />
</LinearLayout>
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout_profile"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="bottom"
android:layout_marginTop="#dimen/profile_tab_layout_top_margin"
android:background="#color/white"
app:tabIndicatorColor="#color/colorPrimary"
app:tabSelectedTextColor="#color/colorPrimary"
app:tabTextColor="#color/charcoal_grey" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/view_pager_profile"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
</RelativeLayout>
</android.support.v4.widget.SwipeRefreshLayout>
and for grid layout of tabs use adapter classes.

Start with AppBarLayout under which you add CollapsingToolbarLayout with scrollFlags="scroll|exitUntilCollapsed",
add LinearLayout with vertical orientation to CollapsingToolbarLayout and add the
FrameLayout with ImageView + Toolbar
RecyclerView
TabLayout

Two things to be done:-
When the search button is clicked, set the visibility of recycler view to VISIBLE
When the back button is pressed, set the visibility of recycler view to GONE
Following are the implementations:
1. Setting the visibility of recycler view to VISIBLE:
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.searchView) {
rView.setVisibility(VISIBLE);
}
return true;
}
2. Setting the visibility of recycle adapter to GONE
MenuItem searchMenuItem = menu.findItem(R.id.searchView);
MenuItemCompat.setOnActionExpandListener(searchMenuItem, new MenuItemCompat.OnActionExpandListener() {
#Override
public boolean onMenuItemActionExpand(MenuItem item) {
return true;
}
#Override
public boolean onMenuItemActionCollapse(MenuItem item) {
recyclerView.setVisibility(GONE);
return true;
}
});
NOTE: Do not forget to keep the visibilty as GONE initially when the activity is started

I know I might be late to this answer but I have also been trying to implement this for a while. The solution I have feels a bit hacky but it is an option for trying to get the tabs to stick. In a simpler solution lets say we wanted the following:
A Collapsing toolbar layout
Which links to a scroll view.
In that scroll view we want the following:
A recyclerview that say scrolls horizontally
Below the recycler view a tab layout
Below the tab layout we want a view pager that will load dynamic fragments within a fixed space.
activity_scrolling.xml the outer parent xml file may look something like this
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.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=".temp.ScrollingActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="#dimen/app_bar_height"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:toolbarId="#+id/toolbar">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_marginBottom="5dp"
app:layout_collapseMode="pin"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<include layout="#layout/content_scrolling" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/fab_margin"
app:layout_anchor="#id/app_bar"
app:layout_anchorGravity="bottom|end"
app:srcCompat="#android:drawable/ic_dialog_email" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Then the inner content_scrolling.xml may look something like this
<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView 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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".temp.ScrollingActivity"
tools:showIn="#layout/activity_scrolling">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="20dp"
android:layout_marginEnd="20dp"
android:gravity="center"
android:text="A Heading"
android:textSize="#dimen/text_xl"
android:textStyle="bold" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/title" />
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/recycler_view"
android:layout_gravity="center"
android:minHeight="60dp"
app:tabGravity="fill"
app:tabIndicatorColor="#color/colorAccent"
app:tabMode="fixed"
app:tabSelectedTextColor="#color/colorPrimaryDark" />
<androidx.viewpager.widget.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="680dp"
android:layout_below="#+id/tabs" />
</RelativeLayout>
</androidx.core.widget.NestedScrollView>
This will allow you to forcefully place the tab layout in a location of your choosing (even if its after a recyler view).
The hacky part which i dont like is this specific line android:layout_height="680dp" which forces the viewpager height to be something specific. I am not sure why wrap_content or match_parent do not work. But this is the best thing to a solution I can provide for the issue of placing TabLayout and ViewPager in specific places.

hide tablayout and appbar using co-ordinator layout

I have a main activity with a appbar layout(also containing a navigation view) and a fragment with a tablayout . I want the user to be able to hide and show both of them while scrolling like Google Play Music app.But I just can't get the app bar to hide as it is not in the fragment although the tablayout is getting hidden fine.Also I can't move the appbar layout into the fragment as this will make my code for switching between fragments using navigation view very complicated.I am using coordinator layout for achieving this.How do I achieve this?.My code is as below-
WelcomeActivity
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="#+id/welcome_toolbar"
layout="#layout/default_toolbar_layout"
app:layout_scrollFlags="scroll|enterAlways"/>
<FrameLayout
android:id="#+id/welcome"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|enterAlways">
</FrameLayout>
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="#+id/welcome_nav"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="#menu/welcome_menu_drawer"/>
</android.support.v4.widget.DrawerLayout>
Myfragment.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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/toolbar_gradient">
<android.support.design.widget.AppBarLayout
android:id="#+id/welcome_feeds_appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.TabLayout
android:id="#+id/welcome_feeds_tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/toolbar_gradient"
app:tabGravity="fill"
app:tabSelectedTextColor="#fff"
app:tabIndicatorColor="#color/accent"
app:layout_scrollFlags="scroll|enterAlways"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/welcome_feeds_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<com.software.shell.fab.ActionButton
android:id="#+id/welcome_feeds_fab"
android:layout_width="56dp"
android:layout_height="56dp"
android:layout_gravity="bottom|right"
android:layout_marginRight="16dp"
android:layout_marginBottom="16dp"
app:button_color="#color/accent"
app:image="#mipmap/add"
app:image_size="24dp"
/>
</android.support.design.widget.CoordinatorLayout>

I haven't tried your code yet.....
Is your tabLayout correctly swipe out the screen on scrolling?
Have you tried to move inside CoordinatorLayout also the Toolbar?
To use the features by design Library all the elements have to be inside CoordinatorLayout and you have to set as your needs the correct property "app:layout_scrollFlags"