Develop Reference

Android LinearLayout and RecyclerView BottomNavigation Alignment

so I can't figure out how to align my bottom navigation in a LinearLayout under a RecyclerView. The items are RecyclerView:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".CategoryActivity">
<android.support.design.widget.AppBarLayout
android:theme="#style/AppTheme.AppBarOverlay"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_category"
android:layout_margin="8dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
</android.support.v7.widget.RecyclerView>
<android.support.design.widget.BottomNavigationView
android:id="#+id/nav_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/windowBackground"
android:layout_alignParentBottom="true"
app:menu="#menu/bottom_nav_menu"/>
</LinearLayout>
The navigation should be always at the bottom.

Okay, here is your layout, it should work as you expected
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<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" />
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_category"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/nav_view"
android:layout_below="#+id/appbar"
android:layout_margin="8dp"
android:orientation="vertical" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/nav_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="?android:attr/windowBackground"
app:menu="#menu/menu_navigation" />
</RelativeLayout>

Not sure but try adding this:
android:layout_gravity="bottom"

If you don't want to change to RelativeLayout, set this attribute to the RecyclerView:
android:layout_weight="1"
This way the RecyclerView will take all the available space pushing the BottomNavigationView to the bottom.

You Can't adjust your BottomNavigationView properly inside LinearLayout. If there are so many items in your RecyclerView then BottomNavigationView will be hidden at the bottom. So you must use RelativeLayout to align it at the bottom and other layouts above of BottomNavigationView. Please check the bellow modified layout.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<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" />
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_category"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/nav_view"
android:layout_below="#+id/appbar"
android:layout_margin="8dp"
android:orientation="vertical" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/nav_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="?android:attr/windowBackground"
app:menu="#menu/menu_navigation" />
</RelativeLayout>

CoordinatorLayout Makes views Unpositioned

Sorry for my bad English.
I was trying to make scrolling Toolbar with recyclerview using Coordinatorlayout. The scrolling works fine but the views gets under the toolbar,like swipe refresh layout Show in .
Activity_main.xml
Im implementing a fragment in FrameLayout mobile_container
<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/main_content"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.naveed.youtubepro.activity.MainActivity">
<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:layout_scrollFlags="scroll|enterAlways"
app:title="#string/app_name">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/mobile_container"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
<me.majiajie.pagerbottomtabstrip.PageNavigationView
android:id="#+id/navigation"
android:elevation="8dp"
android:layout_width="match_parent"
android:layout_height="56dp"
android:layout_alignParentBottom="true"
android:background="#FFF"
app:menu="#menu/bottom_navigation_items"/>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout >
The fragment layout
<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:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/mainandroid.support.v4.widget.SwipeRefreshLayout">
<com.github.ksoichiro.android.observablescrollview.ObservableRecyclerView
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/recyclerViee"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</android.support.v4.widget.SwipeRefreshLayout>

Do Like This .Hope this works.
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/main_content"
android:fitsSystemWindows="true"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/txt_forget_password"
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:layout_scrollFlags="scroll|enterAlways"
app:title="#string/app_name">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/mobile_container"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="0dp">
</FrameLayout>
<me.majiajie.pagerbottomtabstrip.PageNavigationView
android:id="#+id/navigation"
android:elevation="8dp"
android:layout_width="match_parent"
android:layout_height="56dp"
android:background="#FFF"
app:menu="#menu/bottom_navigation_items"/>
</LinearLayout>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout >

Your LinearLayout holding the recycler view as android:layout_height="match_parent" so it will take all the height of the screen bacause the parent is the root layout.
You have to make this LinearLayout take all the height minus the header bar height
You can do this easily :
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1">
<!-- frame and bottom navigation -->
</LinearLayout>
============== UPDATE ==============
Actually you don't even need this LinearLayout
try this (as suggested by Rahul Kushwaha, wrap the whole thing in LinearLayout but you don't need the inner LinearLayout):
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/main_content"
android:fitsSystemWindows="true"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/txt_forget_password"
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:layout_scrollFlags="scroll|enterAlways"
app:title="#string/app_name">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/mobile_container"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="0dp">
</FrameLayout>
<me.majiajie.pagerbottomtabstrip.PageNavigationView
android:id="#+id/navigation"
android:elevation="8dp"
android:layout_width="match_parent"
android:layout_height="56dp"
android:background="#FFF"
app:menu="#menu/bottom_navigation_items"/>
</LinearLayout>

Set your LinearLayout Property
android:layout_marginTop="?attr/actionBarSize"

cant position FrameLayout inside ConstraintLayout

Building main app layout that should have:
1) ConstraintLayout as root - because its new and trending changer of RelativeLayout
2) AppBarLayout with toolbar inside
3) BottomNavigationView at the bottom ofc
4) FAB at bottom right above BNV
5) And FrameLayout - container for my fragments that must be between AppBarLayout and BottomNavigationView.
I cant position my FrameLayout. It appears only match_parent with full device size or 0dp.
<?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:id="#+id/main_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:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay"
app:layout_constraintTop_toTopOf="#+id/frame_container">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_weight="1"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:title="#string/app_name">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
app:layout_constraintTop_toTopOf="parent">
</FrameLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/floatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:clickable="true"
android:focusable="true"
app:layout_constraintBottom_toTopOf="#+id/navigation"
app:layout_constraintEnd_toEndOf="parent"
app:srcCompat="#drawable/ic_home_black_24dp" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#color/primary"
app:elevation="8dp"
app:itemIconTint="#color/icons"
app:itemTextColor="#color/icons"
app:layout_constraintBottom_toBottomOf="#+id/frame_container"
app:layout_insetEdge="bottom"
app:menu="#menu/navigation" />
</android.support.constraint.ConstraintLayout>

Set constraintTop and constraintBottom like this:
<FrameLayout
android:id="#+id/frame_container"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
app:layout_constraintTop_toBottomOf="#+id/appbar"
app:layout_constraintBottom_toTopOf="#+id/navigation">
And also edit the constraints of the other Views

FrameLayout partially gets out of the screen from below in CoordinateLayout

I am new to CoordinateLayout. I want my appBar to hide when listView in FrameLayout scroll up and show again when listView scroll down. But there is two problems.
1" FrameLayout getting out of the screen partially from below.
2" AppBar is not scrolling with listView.
In this below image the blue border is FrameLayout and it is out of screen from below.
Below is activity_main.xml;
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:background="#f9f8f8">
<android.support.design.widget.AppBarLayout
android:id="#+id/appBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:layout_scrollFlags="scroll|enterAlways"/>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/container"
android:paddingRight="16dp"
android:paddingLeft="16dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>
And below is fragment_main_list.xml to which I am populating in FrameLayout of activity_main.xml;
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.nishant.veuz.FragmentMainList">
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/main_progress_bar"
android:layout_gravity="center"
android:visibility="gone"/>
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/list_view_main"
android:dividerHeight="16dp"
android:divider="#null"/>
</FrameLayout>

Try to change your Parent Layout from CoordinatorLayout into LinearLayout, like so
...
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:background="#f9f8f8"
android:fitsSystemWindows="true">
...
from your NestedScrollView try to enclose it with;
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical">
<!-- MAIN CONTENT-->
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/container"
android:paddingRight="16dp"
android:paddingLeft="16dp" />
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

ViewPager and other viewGroup in CoordinatorLayout not working

I observed that adding appbar_scrolling_view_behavior to a ViewPager and that viewPager is not fullScreen (in my case contains some bottom buttons/tabs), then the viewPager has a bigger height (with the height of the toolbar I guess) and overlaps with the other layout(in my case those tabs)
See the images below (one is with the toolbar scrolled up)
This is the xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".AudioRecActivity"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.CoordinatorLayout
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/bottomLayout">
<android.support.design.widget.AppBarLayout android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay"
app:elevation="0dp">
<android.support.v7.widget.Toolbar android:id="#+id/acb_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/AppTheme.AppBarOverlay"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:layout_scrollFlags="scroll|enterAlways">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
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>
<LinearLayout
android:id="#+id/bottomLayout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
<audiorec.com.gui.views.SlidingTabLayout
android:id="#+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#color/secondary" >
</audiorec.com.gui.views.SlidingTabLayout>
<FrameLayout
android:id="#+id/adsContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/secondary" >
<TextView
android:id="#+id/loading_ad_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/advertisement_loading"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#ffffff" />
</FrameLayout>
</LinearLayout>
How the ViewPager/CoordinatorLayout content can be under that Linearlayout if I specified not to be?

I found an answer here:link and works for me as well
It appears it is a "problem" from android team....see here: issue on android