Develop Reference

How To Hide AppBar When Scrolling Down

I have an AppBar and other things in my layout. When the user scrolls down, I want AppBar(actually, the Toolbar to hide. This is what I have tried, the app bar isn't hiding all small part it just stays there. Actually I think the problem is with my header of the screen it gets collapsed and adds a small space when I scroll.
As you can see in second image some part stays it doesn't hide. I need to hide that part while scrolling.
Please provide me solution what am I doing wrong?
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/white">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleTextAppearance="#style/TextAppearance.AppCompat.Title"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:titleEnabled="false">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/slideIV"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:src="#drawable/ic_dish" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/bottomButtonRL"
android:layout_gravity="bottom"
android:background="#drawable/gradient_bg" />
<View style="#style/itemBottomViewLarge" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_margin="#dimen/_20"
android:gravity="center_vertical"
android:orientation="vertical">
<de.hdodenhof.circleimageview.CircleImageView
android:layout_width="80dp"
android:layout_height="80dp"
android:src="#drawable/fake_chef_bg"
app:civ_border_color="#color/border_grey_color"
app:civ_border_width="#dimen/_2" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/_5"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/bold_font"
android:text="#string/fatima_al_zahraa"
android:textColor="#color/white"
android:textSize="#dimen/large_text_size"
android:textStyle="bold" />
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:fontFamily="#font/regular_font"
android:text="#string/presenter_of_the_cuient"
android:textColor="#color/white"
android:textSize="#dimen/app_text_size" />
</LinearLayout>
</LinearLayout>
<RelativeLayout
android:id="#+id/bottomButtonRL"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_below="#+id/slideIV"
android:layout_marginTop="-25dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<View
android:layout_width="match_parent"
android:layout_height="#dimen/_0"
android:layout_weight="1" />
<View
android:layout_width="match_parent"
android:layout_height="#dimen/_0"
android:layout_weight="1"
android:background="#color/defaultColor" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingStart="#dimen/_20"
android:paddingLeft="#dimen/_20">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:src="#drawable/ic_share" />
<RelativeLayout
android:layout_width="220dp"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/_10"
android:layout_marginLeft="#dimen/_10"
android:background="#drawable/ic_rec1">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fontFamily="#font/regular_font"
android:gravity="center"
android:layout_centerInParent="true"
android:text="#string/add_to_fav"
android:textColor="#color/white"
android:textSize="#dimen/medium_text_size" />
</RelativeLayout>
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/bottom_radius_view">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/regular_font"
android:padding="#dimen/_20"
android:text="#string/galetes_fires_au_plates_fires_au_plates_fires_au_plates_fires_au_plates_fires_au_plates"
android:textColor="#color/white"
android:textSize="#dimen/app_text_size" />
</LinearLayout>
</LinearLayout>
<androidx.appcompat.widget.Toolbar
android:visibility="gone"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
/>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingLeft="#dimen/_20"
android:paddingTop="#dimen/_10"
android:paddingRight="#dimen/_20">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/bold_font"
android:padding="#dimen/_5"
android:text="#string/les_videos"
android:textColor="#color/medium_grey_text_color"
android:textSize="#dimen/large_text_size" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/itemFRV"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="#dimen/_5" />
</LinearLayout>
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</layout>
This is the header code:
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="#dimen/header_height"
android:background="#color/white"
android:gravity="center"
android:orientation="horizontal"
android:paddingLeft="#dimen/_20"
android:paddingRight="#dimen/_20">
<LinearLayout
android:id="#+id/backLL"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="left"
android:gravity="center"
android:paddingRight="#dimen/_20"
android:layout_marginBottom="#dimen/_10"
android:visibility="gone">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:src="#drawable/ic_back" />
</LinearLayout>
<ImageView
android:id="#+id/logoIV"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:adjustViewBounds="true"
android:paddingStart="0dp"
android:paddingTop="#dimen/_15"
android:paddingEnd="#dimen/_10"
android:layout_marginBottom="#dimen/_10"
android:src="#drawable/ic_header_logo" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
<ImageView
android:id="#+id/profileIV"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:adjustViewBounds="true"
android:paddingStart="#dimen/_10"
android:paddingTop="#dimen/_15"
android:paddingEnd="0dp"
android:layout_marginBottom="#dimen/_10"
android:src="#drawable/ic_default_user" />
</LinearLayout>
</layout>

Answer to the problem is just remove
android:fitsSystemWindows="true"

Change the layout_scrollFlags
app:layout_scrollFlags="scroll|exitUntilCollapsed"
replace above line with
app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed"

Changing from one view to another view onScroll

I am working a project. I have a a layout with a view at top and a Scrollview at the bottom of the view. Initially the layout will look like this.
After I scroll up the bottom layout. The view should smoothly change the the below view. And if I scroll down the view should come back to its previous layout.
As you can see there is a change in the position and size of the textviews. How can I achieve this ?
Here is the layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:id="#+id/home_parentLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:animateLayoutChanges="true"
android:background="#color/AT_charcoal">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginBottom="9dp"
android:background="#drawable/topographybackgroundx">
<RelativeLayout
android:id="#+id/layout_header_profile"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="20dp">
<RelativeLayout
android:id="#+id/top_ExpandedHeader"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<ImageButton
android:id="#+id/image_invisalignLogo"
android:layout_width="108dp"
android:layout_height="26dp"
android:background="#drawable/invis_logo"
android:contentDescription="#null" />
<ImageButton
android:id="#+id/image_profile"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:background="#drawable/ic_profile_wht"
android:contentDescription="#null" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/number_RelativeLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RelativeLayout
android:id="#+id/layout_aligner_expanded_change"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp">
<TextView
android:id="#+id/image_alignerNumber"
style="#style/BigNumber"
android:layout_width="wrap_content"
android:layout_height="138dp"
android:layout_alignParentStart="true"
android:layout_below="#+id/textview_alignerTimeChange"
android:maxLength="2"
android:maxLines="1"
android:text="#string/three"
android:textSize="124sp" />
<TextView
android:id="#+id/textview_alignerChange"
style="#style/BodyWhite"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginTop="80dp"
android:layout_toEndOf="#id/image_alignerNumber"
android:letterSpacing="0.03"
android:text="#string/days_alignerchange" />
<de.hdodenhof.circleimageview.CircleImageView xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/image_selfie_icon"
android:layout_width="96dp"
android:layout_height="96dp"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
app:civ_border_color="#FFFFFFFF"
app:civ_border_width="2dp" />
<TextView
android:id="#+id/textview_6alignerNumber"
style="#style/HeaderWhite"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/image_alignerNumber"
android:layout_below="#id/image_alignerNumber"
android:layout_marginTop="2dp"
android:letterSpacing="0.03"
android:text="#string/aligner_number" />
<TextView
android:id="#+id/textview_expanalignerNumber"
style="#style/HeaderWhite"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/image_alignerNumber"
android:layout_toEndOf="#id/textview_6alignerNumber"
android:text="5" />
<TextView
android:id="#+id/textview_alignerTimeChange"
style="#style/LargeHeaderWhite"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="17dp"
android:letterSpacing="0.03"
android:text="#string/aligner_change"
android:visibility="gone" />
<Button
android:id="#+id/button_change"
style="#style/TextButtonWhite"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/textview_alignerTimeChange"
android:layout_marginTop="15dp"
android:background="#color/AT_lushGreen"
android:gravity="center_vertical"
android:paddingLeft="30dp"
android:paddingRight="30dp"
android:text="#string/changenow"
android:visibility="gone" />
</RelativeLayout>
<View
android:id="#+id/dividerline"
android:layout_width="fill_parent"
android:layout_height="2dp"
android:layout_below="#id/number_RelativeLayout"
android:layout_marginTop="12dp"
android:background="#color/AT_line" />
<TextView
android:id="#+id/addPhoto_TextView"
style="#style/BtnTextBlue18"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/dividerline"
android:layout_marginTop="10dp"
android:text="#string/add_photo" />
<TextView
android:id="#+id/goCalendar_TextView"
style="#style/BtnTextGold18"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_below="#id/dividerline"
android:layout_marginTop="7dp"
android:text="#string/go_calendar" />
</RelativeLayout>
</RelativeLayout>
<include
layout="#layout/homescreen_scrollview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/layout_header_profile"
android:layout_marginTop="15dp" />
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>

You can use the Collapsing Toolbar Layout
Example Here and here
Edit: some piece of code
<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.support.design.widget.AppBarLayout
android:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:contentScrim="?attr/colorPrimary">
<ImageView
android:id="#+id/expandedImage"
android:layout_width="match_parent"
android:layout_height="200dp"
android:src="#drawable/beach_scene"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7"
/>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin" >
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/sample_string"/>
</android.support.v4.widget.NestedScrollView>

Using a Collapse Tool Bar as João said, your code should be like this
and getting my answer as base from here
<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:clipToPadding="false">
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="210dp"
android:background="#color/WHITE">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:collapsedTitleTextAppearance="#style/TextAppearance.AppCompat.Widget.ActionBar.Title.Inverse"
app:expandedTitleMarginStart="72dp"
app:expandedTitleTextAppearance="#style/TextAppearance.AppCompat.Widget.ActionBar.Title.Inverse"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<Your Content>
<android.support.v7.widget.Toolbar
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="40dp"
app:layout_collapseMode="pin" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<include
layout="#layout/homescreen_scrollview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/layout_header_profile"
android:layout_marginTop="15dp" />
On <Your Content> is the place where you should put your string.
Sorry that I can't help more. Your Cody is a little messy and really hard to understand.
Maybe if you edit leaving only the important codes will help.
But maybe this library can help you.

How to make CardView overlap AppBarLayout

I have tried to accomplish something similar to the following layout.
There are a few things to note. The cardview that overlaps the appbar is not supposed to be a part of a nestedscrollview as I have a nestedscrollview in the xml layout. The cardview is positioned correctly but it comes just beneath the appbarlayout.

I just got the solution to this now. I did not give the CardView an elevation value before and that was wrong. I just assumed that making it come last in the CoordinatorLayout should place it on top. It works now. I have added an elevation value. Here is the code -
<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.support.design.widget.AppBarLayout
android:id="#+id/appBar"
android:layout_width="match_parent"
android:layout_height="250dp"
>
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/toolbarlayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/quotes"
android:scaleType="centerCrop"/>
<android.support.v7.widget.Toolbar
android:id="#+id/tool"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="parallax"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorWhite"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_marginRight="32dp"
android:layout_marginLeft="32dp"
app:layout_anchor="#id/appBar"
app:layout_anchorGravity="bottom|center"
app:cardElevation="#dimen/small_padding"
/>
</android.support.design.widget.CoordinatorLayout>

Try with the following layout.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="#color/colorAccent"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:layout_scrollFlags="scroll|enterAlways"
app:layout_collapseMode="pin">
<ImageView
android:id="#+id/toolbar_logo"
android:src="#drawable/ic_launcher"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center"/>
</android.support.v7.widget.Toolbar>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_marginLeft="45dp"
android:layout_marginRight="45dp"
app:cardCornerRadius="8dp"
app:cardElevation="7dp"
android:layout_marginTop="150dp"
android:id="#+id/cardView">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="10dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Photos" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="376" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Followers"
android:layout_gravity="center"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1769"
android:layout_gravity="center"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Following"
android:layout_gravity="center"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="127"
android:layout_gravity="center"/>
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
</RelativeLayout>

Layout is behind Navigation bar (out of screen)

I created a Basic-Activity and have the activity_main which includes the content_main. But at the Design-Screen I can see, that the included content_main starts below the toolbar and ends behind the navigationbar. I think that the Included layout is as high as the full screen and not as high as the space between toolbar and the end of screen. What can I do?
Screenshot of Designscreen
Activity_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"
tools:context="com.htlhl.kellergassen_app.MainActivity"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
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="#color/KG_orange">
<android.support.v7.widget.AppCompatTextView
android:id="#+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/HomeActivity"
style="#style/Toolbartitle_KG" />
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_main" />
</android.support.design.widget.CoordinatorLayout>
Content_Main
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/background2"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.htlhl.kellergassen_app.MainActivity"
tools:showIn="#layout/activity_main"
android:id="#+id/rl_main">
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentEnd="false"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:orientation="vertical"
android:onClick="here">
<ImageView
android:id="#+id/Kellergassenlogo"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="0dp"
android:contentDescription="#string/ButtonKellergasse"
android:onClick="toKellerkatze"
android:src="#drawable/kk_logo" />
<Button
android:id="#+id/btnToKellergasse"
android:layout_width="180dp"
android:layout_height="36dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="12dp"
android:background="#drawable/roundbutton"
android:onClick="toKellerkatze"
android:text="#string/ButtonKellergasse"
android:textColor="#color/white"
android:textSize="15sp" />
<ImageView
android:id="#+id/Routenlogo"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_gravity="top|bottom|center_horizontal"
android:layout_marginTop="15dp"
android:contentDescription="#string/ButtonRoute"
android:onClick="toRouten"
android:src="#drawable/routenlogo" />
<Button
android:id="#+id/btnToRouten"
android:layout_width="180dp"
android:layout_height="36dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="12dp"
android:background="#drawable/roundbutton"
android:onClick="toRouten"
android:text="#string/ButtonRoute"
android:textColor="#color/white"
android:textSize="15sp" />
</LinearLayout>
<Button
android:id="#+id/btnParse"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="parse"
android:textColor="#color/black"
android:background="#color/KG_green"
android:onClick="startParsing"/>
<LinearLayout
android:id="#+id/layout_bottom_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal"
android:weightSum="3">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginStart="10dp"
android:layout_weight="2"
android:gravity="center"
android:orientation="vertical">
<fragment
android:id="#+id/fragmentChooseLang"
android:name="com.htlhl.kellergassen_app.FragmentLanguage"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/tvChooseLang"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:drawableTop="#drawable/german_flag"
android:text="#string/chooseLanguage"
android:textSize="12sp"
android:textStyle="bold" />
</LinearLayout>
<Button
android:id="#+id/btnToImpressum"
style="?android:attr/borderlessButtonStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/ButtonImpressum"
android:textSize="15sp"
android:textStyle="bold"
android:layout_gravity="bottom"/>
</LinearLayout>
</RelativeLayout>
The Layout named "layout_bootom_main" is not shown, because it is layout_alignParentBottom and the parents end is out of screen.

You can add scroll view in content_main as parent view for both linear layouts.
<RelativeLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<!-- Add your linear layouts here -->
</LinearLayout>
</ScrollView>
</RelativeLaout>
And while designing in android studio try to preview the design with device having more hight

You could wrap everything inside a scrollview like this:
<RelativeLayout
......>
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<-! All the layout children in here-->
</ScrollView>
</RelativeLaout>

Coordinator Layout with RecyclerView

I am using a CoordinatorLayout with RecyclerView.The app runs fine but my problem is the the view should only scroll as the items in RecyclerView.In my case i have only 3 items but the CordinatorLayout will scroll the RecyclerView till it will snap to the top because of this i am getting the below part as white as the listsize is only 3.
XMl
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<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.support.design.widget.AppBarLayout
android:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="#android:color/transparent"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/textView38"
android:layout_alignParentTop="true"
android:padding="20dp"
android:src="#drawable/ic_filter_back" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/rv_event_details"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clipToPadding="false"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
<LinearLayout
android:id="#+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#fff"
android:orientation="horizontal"
android:paddingBottom="03dp">
<RelativeLayout
android:id="#+id/rl_tab1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<ImageView
android:id="#+id/tab1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:padding="05dp"
android:src="#drawable/ic_create_wedding_admin" />
<TextView
android:id="#+id/tv_tab_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/tab1"
android:layout_marginLeft="05dp"
android:layout_marginRight="05dp"
android:gravity="center"
android:text="Admin" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/rl_tab2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<ImageView
android:id="#+id/tab2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:padding="05dp"
android:src="#drawable/ic_create_wedding_guests" />
<TextView
android:id="#+id/tv_tab_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/tab2"
android:layout_marginLeft="05dp"
android:layout_marginRight="05dp"
android:gravity="center"
android:text="Guests" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/rl_ed_tab_guests"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<ImageView
android:id="#+id/iv_ed_iv_budget"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:padding="05dp"
android:src="#drawable/ic_create_wedding_budget" />
<TextView
android:id="#+id/tvbud"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/iv_ed_iv_budget"
android:layout_marginLeft="05dp"
android:layout_marginRight="05dp"
android:gravity="center"
android:text="Budget" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/rl_ed_tab_tasks"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<ImageView
android:id="#+id/iv_ed_iv_tasks"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:padding="05dp"
android:src="#drawable/ic_create_wedding_tasks" />
<TextView
android:id="#+id/tv_ed_tasks"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/iv_ed_iv_tasks"
android:layout_marginLeft="05dp"
android:layout_marginRight="05dp"
android:gravity="center"
android:text="Tasks" />
</RelativeLayout>
</LinearLayout>
What i want is to scroll the view only till the item size.

This issue has already been brought up.
Please check other questions before posting another.
You need to provide a custom behavior to your child layout in the Coordinator Layout.
Check this if it helps:
https://stackoverflow.com/a/33461064/2346980