Develop Reference

RecyclerView does not scroll while searching

I have a recyclerview assoicated with a filtered search in a toolbar. When I start the search, the number of items displayed by the recyclerview is far larger than the screen size. But when I try to scroll up by swiping to look at the elements off the screen, there no response. I thought RecyclerViews like ListViews always support scrolling. Any ideas why my RecyclerView is not scrolling?
Here is the coordinator layout for the tool bar, search, and recycler view that gets included in my main layout (I apologize for the formatting but the insert code widget does not work correctly):
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.lampreynetworks.cpa.CPA_Activity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_search_id"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/colorToolbarBackground"
android:theme="#style/AppThemeDark"
app:contentInsetEnd="0dp"
app:contentInsetStart="0dp">
</android.support.v7.widget.Toolbar>
<android.support.v7.widget.RecyclerView
android:id="#+id/card_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
The main layout is as follows
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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/base_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.lampreynetworks.cpa.CPA_Activity"
android:orientation="vertical">
<include
android:id="#+id/toolbar_search"
layout="#layout/toolbar_search_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:id="#+id/borderLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="4dp"
android:background="#drawable/text_view_border"
android:orientation="vertical">
<TextView
android:id="#+id/text_connect_status"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="some text"
android:textColor="#color/orange"
android:textStyle="bold"/>
</RelativeLayout>
<ListView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="#+id/borderLayout"
android:layout_marginLeft="4dp"
android:layout_marginStart="4dp"
android:choiceMode="none"
android:stackFromBottom="false">
</ListView>
</RelativeLayout>
<android.support.design.widget.NavigationView
android:id="#+id/navigation_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="#menu/nav_drawer_menu"/>
</android.support.v4.widget.DrawerLayout>
</LinearLayout>
All other aspects appear to be okay. The list interactively responds to user input text and click actions on the recyclerview items are able to obtain the searched-for information. But this list never scrolls. I have tried numerous approaches taking hints from related issues (adding various types of scroll layouts, invoking scroll-related attributes in various places, etc. all within the coordinator layout) but the behavior remains unchanged. There must be something really stupid that I am doing to kill such a basic behavior.

Try moving the RecyclerView outside of the AppBarLayout as follows:
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.lampreynetworks.cpa.CPA_Activity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_search_id"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/colorToolbarBackground"
android:theme="#style/AppThemeDark"
app:contentInsetEnd="0dp"
app:contentInsetStart="0dp">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/card_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>

change recyclerview height to wrap_content.
<android.support.v7.widget.RecyclerView
android:id="#+id/card_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
put your recyclerview out of AppBarLayout.

Bottom navigation overlapping recycler view contents in android

I am using bottom navigation view and displaying three tabs,In one of the tab i have added recycler view, but the contents are overlapped by bottom navigation.Not able to scroll recycler view.Is there any way that i can hide the bottom navigation when i scroll item on recycler view.
<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:fab="http://schemas.android.com/apk/res-auto"
xmlns:sv="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".activity.patient.PatientsActivity">
<include
layout="#layout/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<RelativeLayout
android:id="#+id/asd"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="60dp"
android:orientation="vertical">
<co.moonmonkeylabs.realmrecyclerview.RealmRecyclerView
android:id="#+id/appointmentsList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:rrvEmptyLayoutId="#layout/empty_view"
app:rrvLayoutType="LinearLayout"
app:rrvSwipeToDelete="true" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
app:itemBackground="#color/white"
app:layout_behavior=".BottomNavigationBehavior"
app:menu="#menu/bottom_navigation_main" />
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout> </android.support.v4.widget.DrawerLayout>
image

First i think you could add an:
android:layout_above="#id/bottom_navigation"
To the Recyclerview
For the Scrolling part i would suggest looking for a ScrollingBehaviour
like in this question:
How to scroll up/down of bottom bar on scrolling of RecyclerView

add NestedScrollView just before RecyclerView this may work like above
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<co.moonmonkeylabs.realmrecyclerview.RealmRecyclerView
android:id="#+id/appointmentsList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:rrvEmptyLayoutId="#layout/empty_view"
app:rrvLayoutType="LinearLayout"
app:rrvSwipeToDelete="true" />
</android.support.v4.widget.NestedScrollView>

Hiding View in Fragment on Scroll of Other View

I am using Navigation drawer activity in content_main there is one linear layout which will be inflate with fragment.
content_main.xml
<?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:id="#+id/content_home"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="net.techdesire.khabargujarat.HomeActivity"
tools:showIn="#layout/app_bar_home">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fragment_container"/>
</RelativeLayout>
fragment_home.xml
<android.support.percent.PercentRelativeLayout
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="fragment.HomeFragment">
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
app:layout_heightPercent="40%"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp"
app:layout_heightPercent="60%"
android:layout_below="#+id/viewpager">
<TextView
android:id="#+id/about"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="#string/about_khijadiya"
android:textAppearance="#style/TextAppearance.AppCompat.Large"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/about"
android:text="#string/dummy"
android:textAppearance="#style/TextAppearance.AppCompat.Medium"/>
</RelativeLayout>
</android.support.percent.PercentRelativeLayout>
I have large content in textview named about. I want to make it scrollable,like in image.First scroll relativelayout to full screen and if content of about is still overflow then make only about textview scrollable. When scroll reach to top and if user swipe down from there then re-display viewpager.

I think, your requirement is collapsing the view while scrolling.
So you can use
"android.support.design.widget.CollapsingToolbarLayout".
It is implemented in material design.
You can refer this link:
http://www.androidhive.info/2016/05/android-working-with-card-view-and-recycler-view/

Android Scroll View in fragment crops content

I created a Scroll View which should allow me to scroll through all the content which is inside Linear Layout (that is a child of Scroll View).
Code looks like this:
<ScrollView 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="pl.oakfusion.delegator.DomesticDelegationSecondFragment">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
....
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="25dp"
android:layout_marginTop="25dp"
android:background="#color/textDarkest"
android:text="Save"
android:textColor="#color/textColor"
android:layout_gravity="right" />
</LinearLayout>
Preview looks like this:
But in my app I have this:
I can't scroll down, this is all I can see.
If I allow to rotate I have horizontal view:
which now allows me to scroll but cuts the button entirely. (On the picture is bottom of view) I can pull down fast and I can see that the button is there but it goes up again (this android thing when you can pull slightly further but it scrolls back)
How can I fix this?
Hosting activity:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="pl.oakfusion.delegator.DomesticDelegationActivity">
<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">
<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:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />

try adding this to the scrollView in your xml layout
android:fillViewport="true"

I have experienced the same problem once. I tried adding padding for the ViewGroup inside ScrollView. Then it worked fine. Its a hacky solution and not an ideal one.
For the example mentioned above (by user3212350):
I have added some padding to the LinearLayout inside ScrollView to make the view completely visible. The amount of padding required may differ for various screen sizes.
<ScrollView 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="pl.oakfusion.delegator.DomesticDelegationSecondFragment">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
##android:paddingBottom="50dp"##>
....
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="25dp"
android:layout_marginTop="25dp"
android:background="#color/textDarkest"
android:text="Save"
android:textColor="#color/textColor"
android:layout_gravity="right" />
</LinearLayout>

Fragment from View Pager hiding behind Tab Bar

I am having an issue with a Tab bar and ViewPager in my android project. What the app does it has an activity which hosts a tab layout and then has 2 fragment which represents each of the tabs.
When the activity is opened it posts to an API to get some data and puts the data into a data adapter for a Recycler View and Card layout in each of the fragments.
The recycler view will contain 3 items but only 2 are being shown as the first is being hidden under the toolbar and/or the tab bar as shown in the screenshot below.
Below is the layout file of my activity
<?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"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="com.BoardiesITSolution.CritiMonApp.AppsActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<include layout="#layout/toolbar" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill" />
</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_behaviour="#string/appbar_scrolling_view_behaviour" />-->
</android.support.design.widget.CoordinatorLayout>
Below is the layout of the fragment
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<view
android:id="#+id/recycler_view"
class="android.support.v7.widget.RecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true" />
</LinearLayout>
Below is the layout for card layout
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:cardview="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="80dp"
android:layout_margin="8dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="80dp"
android:elevation="5dp">
<TextView
android:id="#+id/txtApplicationName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:maxLines="3"
android:padding="8dp"
android:textColor="#222"
android:textSize="15dp"
android:layout_centerInParent="true"/>
</RelativeLayout>
</android.support.v7.widget.CardView>
Below is the screenshot as mentioned above which shows the problem. I've pixelated some of the text but it should you what I mean, there should be 3 items but the first item is hiding underneath the tab bar.

Edit: As suggested below by #smeet and #hardik, adding the scroll behavior app:layout_behavior="#string/appbar_scrolling_view_behavior" should fix the problem while preserving the scroll behavior. Scroll behaviors only work if the view is a direct child of the coordinator layout.
Old Answer
Just Wrap your appbar layout and viewpager in a vertical LinearLayout
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="com.BoardiesITSolution.CritiMonApp.AppsActivity">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
//appbar layout
//viewpager
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
From the docs, CoordinatorLayout is a super-powered FrameLayout. So you can expect the typical "lay views on top of other views" FrameLayout behavior.

Adding :
app:layout_behavior="#string/appbar_scrolling_view_behavior"
in ViewPager resolved issue in my case.

if we will wrap app bar layout with linear layout than toolbar will not hide when you scroll so accepted answer might not help you if you want to hide toolbar when you scroll.
Smeet did it right way but not explained! here is full example with explanation.
add app namspace to CoordinatorLayout
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
......
>
and just add below line in your ViewPager
app:layout_behavior="#string/appbar_scrolling_view_behavior"
complete xml will be as below
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<android.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="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay" />
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_height="match_parent" />
</android.support.design.widget.CoordinatorLayout>