Develop Reference

How can I place two components in ScrollView, one being a cardView and other a recyclerView

I am new to android and trying to make a profile section of a social media app. The profile section is a fragment and inside this I wanted to have a CardView to hold user's information and then a RecyclerView to show user's posts. I have tried implementing this using a ScrollView and putting insinde the cardView and RecyclerView. I wanted both cardView and RecyclerView to be scroll as one, but currently the cardView is at its place and only elements in recyclerView are scrolling.
EDIT
NestedScrollView kind of worked for me. But I also wanted overScrollMode to work fine while scrolling to the end.
<ScrollView 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=".ui.profile.ProfileFragment">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<com.google.android.material.card.MaterialCardView
style="?attr/materialCardViewFilledStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp">
<androidx.cardview.widget.CardView
android:layout_width="120dp"
android:layout_height="120dp"
app:cardCornerRadius="100dp">
<ImageView
android:id="#+id/profileDisplayPicture"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="#string/user_profile_picture"
android:scaleType="centerCrop" />
</androidx.cardview.widget.CardView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_margin="10dp"
android:orientation="vertical">
<TextView
android:id="#+id/profileName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="#style/TextAppearance.AppCompat.Headline" />
<TextView
android:id="#+id/profileCollegeInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="#style/TextAppearance.AppCompat.Subhead" />
</LinearLayout>
</LinearLayout>
<com.google.android.material.divider.MaterialDivider
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<ImageView
android:id="#+id/profileLinkedinBtn"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_margin="10dp"
android:contentDescription="#string/linkedin"
android:src="#drawable/ic_linkedin" />
<ImageView
android:id="#+id/profileMailBtn"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_margin="10dp"
android:contentDescription="#string/mail"
android:src="#drawable/ic_gmail" />
</LinearLayout>
</LinearLayout>
</com.google.android.material.card.MaterialCardView>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/profileRecyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</ScrollView>

NestedScrollView in my layout becomes sluggish when a few more small views are added below it

I'm trying to add a few icons for a custom bottom navigation bar in my layout, and when I tried to add them, the NestedScrollView that occupies most of the screen has become very slow, the scrolling doesn't go smoothly with the touch gestures anymore just because of adding a few icons.
I don't understand this behavior of the NestedScrollViews. It contains a recyclerview by the way. I've put up my layout code here. The bottom_layout, which contains a view group with four icon-sized images causes the issue. If I have 1 or 2 images instead, there is no issue at all.
Edit: If possible, I would like to have some advice on a good way to load a layout which has lists as children of a scrolling view.
XML:
<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="#ffffff"
tools:context=".activities.PlacesActivity">
<LinearLayout
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:layout_marginTop="22sp"
android:background="#555555"
android:orientation="horizontal">
<TextView
android:id="#+id/place_toolbar_title"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:layout_marginLeft="10dp"
android:layout_weight="0.2"
android:gravity="center_vertical"
android:textColor="#f4e92c"
android:textSize="21sp" />
<!-- android:text="Cubbon Park" for the above textview-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_weight="0.9"
android:gravity="center">
<ImageView
android:id="#+id/places_profile_button"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginLeft="12dp"
android:layout_marginTop="4sp"
android:padding="5dp"
android:src="#drawable/profile3x" />
</LinearLayout>
</LinearLayout>
<android.support.v4.widget.NestedScrollView
android:id="#+id/scrollview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#id/bottom_layout"
android:layout_below="#id/toolbar"
android:fillViewport="true"
app:layout_anchor="#id/toolbar"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="blocksDescendants"
android:orientation="vertical">
<ImageView
android:id="#+id/image_place_header"
android:layout_width="match_parent"
android:layout_height="200dp"
android:scaleType="centerCrop"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="5dp"
android:background="#ececef" />
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/map_card_place"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center">
<LinearLayout
android:id="#+id/map_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/map_icon"
android:layout_width="30dp"
android:layout_height="30dp"
android:src="#drawable/location3x" />
<TextView
android:id="#+id/labelOnMap"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:gravity="center_vertical"
android:paddingLeft="5dp"
android:text="Point of Interest"
android:textColor="#757575"
android:textSize="20sp" />
</LinearLayout>
<fragment xmlns:android="http://schemas.android.com
/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/map"
android:name="com.testapp.android.WorkaroundMapFragment"
android:layout_width="match_parent"
android:layout_height="170dp"
tools:context="com.example.googlemap.MapsActivity" />
</LinearLayout>
</android.support.v7.widget.CardView>
<!--recyclerview containing all the content-->
<android.support.v7.widget.RecyclerView
android:id="#+id/metadata"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
<include
android:id="#+id/bottom_layout"
layout="#layout/bottom_bar"
android:layout_width="match_parent"
android:layout_alignParentBottom="true"
android:layout_height="40dp" />
<ImageButton
android:id="#+id/fab_main"
android:layout_width="62dp"
android:layout_height="62dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:background="?attr/selectableItemBackgroundBorderless"
android:scaleType="fitCenter"
android:src="#drawable/btn_scan_large" />
</RelativeLayout>

I found out the solution to remove sluggishness was to just place the images in drawable-nodpi folder.
found this answer here helpful:
https://stackoverflow.com/a/51960548/10165076

how can get red of empty space inside CardView?

Dear Android Developers I am a creating cv Android app but there are empty after TextView inside CardView how can I get rid of that space
below my xml code where I have implemented CardView as parent child as LinearLayout.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
card_view:cardCornerRadius="0dp"
card_view:cardPreventCornerOverlap="true"
card_view:cardUseCompatPadding="true">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="30dp"
android:scaleType="centerCrop" />
<Space
android:layout_width="50dp"
android:layout_height="20dp" />
<TextView
android:id="#+id/about"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_marginRight="250dp"
android:gravity="center"
android:text="#string/about_me"
android:textSize="16sp"
android:textStyle="bold" />
<TextView
android:id="#+id/introduction"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="16dp"
android:gravity="start" />
</LinearLayout>
</android.support.v7.widget.CardView>

Change layout height of card view to match_parent

reduce marginTop of your text View remove the Space tag also and also reduce margin of your imageView

use this attributes in your cardview you can see the difference
your card do not have elevation and radius and that card view merge to the activity that's why it showing like a space after text use this in your card view:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="8dp">
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardCornerRadius="8dp"
card_view:cardElevation="6dp"
android:elevation="4dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:orientation = "vertical">
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="30dp"
android:scaleType="centerCrop" />
<TextView
android:id="#+id/about"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_marginRight="250dp"
android:gravity="center"
android:text="#string/about_me"
android:textSize="16sp"
android:textStyle="bold" />
<TextView
android:id="#+id/introduction"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="16dp"
android:gravity="start" />
</LinearLayout>
</android.support.v7.widget.CardView>
</RelativeLayout>

Scroll View does not work on OS 4.1.2

I have added scroll view in a layout, scroll view has attributes of match parent for height and width also fillViewPort is true for scroll view, its working in other devices but not working in android OS 4.1.2.
Layout :
<?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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:background="#android:color/white"
android:layout_height="match_parent">
<!-- <RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<!– <ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:alpha="0.5"
android:scaleType="fitXY"
android:src="#drawable/page"/>–>
</RelativeLayout>-->
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="8">
<TextView
android:id="#+id/main_welcome"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="#dimen/dimen_20dp"
android:text="#string/welcome"
android:textColor="#color/colorPrimary"
android:textStyle="bold" />
<GridView
android:id="#+id/gridviewMain"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="#dimen/dimen_40dp"
android:layout_marginLeft="#dimen/dimen_40dp"
android:layout_marginRight="#dimen/dimen_40dp"
android:columnWidth="80dp"
android:horizontalSpacing="#dimen/dimen_10dp"
android:numColumns="2"
android:stretchMode="columnWidth"
android:verticalSpacing="10dp"></GridView>
</LinearLayout>
</ScrollView>
<TextView
android:id="#+id/textView20"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_centerInParent="false"
android:text="For Any Queries Related To Mobile App Click On Service Request"
android:textAlignment="center" />
</RelativeLayout>
What can be the reason for this? All other scroll views are working in same device just not working on this screen.
Please help.Thank you..

Try Using nestedScrollView instead
<nestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="8">
<TextView
android:id="#+id/main_welcome"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="#dimen/dimen_20dp"
android:text="#string/welcome"
android:textColor="#color/colorPrimary"
android:textStyle="bold" />
<GridView
android:id="#+id/gridviewMain"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="#dimen/dimen_40dp"
android:layout_marginLeft="#dimen/dimen_40dp"
android:layout_marginRight="#dimen/dimen_40dp"
android:columnWidth="80dp"
android:horizontalSpacing="#dimen/dimen_10dp"
android:numColumns="2"
android:stretchMode="columnWidth"
android:verticalSpacing="10dp"></GridView>
</LinearLayout>
</nestedScrollView>

Floating Action Button and CardView

How to add Floating Action Button from the support library for CardView so that when you scroll through the ScrollView, the button has gone up along with the card?
My app
before scrolling
after scrolling
The button should go along with the card
I want to fix this
Layout
<?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"
>
<ScrollView
android:id="#+id/nested_scroll_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white_vk_background_color">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/spacing_8"
android:orientation="vertical"
android:padding="#dimen/spacing_16">
<android.support.v7.widget.CardView
android:id="#+id/behavior_card_view"
style="#style/RateCardView"
app:cardBackgroundColor="#color/white"
app:cardCornerRadius="#dimen/spacing_2"
app:cardElevation="#dimen/spacing_8">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="#dimen/spacing_16"
android:orientation="vertical"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingBottom="#dimen/spacing_8">
<TextView
android:id="#+id/description_rate_usd_text_view"
style="#style/AppTextView.RateTextView"
android:text="#string/description_currency_text_view_usd"/>
<TextView
android:id="#+id/rate_usd_text_view"
style="#style/AppTextView.RateTextView"
android:layout_centerHorizontal="true"
android:layout_toRightOf="#id/description_rate_usd_text_view"
tools:text="63.99"
/>
<TextView
android:id="#+id/rate_difference_usd_text_view"
style="#style/AppTextView.DifferenceTextView"
android:layout_toRightOf="#id/rate_usd_text_view"
tools:text="+0.44"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingBottom="#dimen/spacing_8">
<TextView
android:id="#+id/description_rate_eur_text_view"
style="#style/AppTextView.RateTextView"
android:text="#string/description_currency_text_view_eur"/>
<TextView
android:id="#+id/rate_eur_text_view"
style="#style/AppTextView.RateTextView"
android:layout_centerHorizontal="true"
android:layout_toRightOf="#id/description_rate_eur_text_view"
tools:text="71.99"
/>
<TextView
android:id="#+id/rate_difference_eur_text_view"
style="#style/AppTextView.DifferenceTextView"
android:layout_toRightOf="#id/rate_eur_text_view"
tools:text="+0.15"/>
</RelativeLayout>
<TextView
android:id="#+id/rate_update_time_text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom|start"
android:layout_marginBottom="#dimen/spacing_8"
android:layout_marginLeft="#dimen/spacing_16"
android:layout_marginTop="#dimen/spacing_16"
android:gravity="center"
android:textSize="#dimen/density_font_size_text_date"
tools:text="Date: 15.07.2016"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:id="#+id/converter_card_view"
style="#style/RateCardView"
app:cardBackgroundColor="#color/white"
app:cardCornerRadius="#dimen/spacing_2"
app:cardElevation="#dimen/spacing_8">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="#dimen/spacing_16">
<com.rengwuxian.materialedittext.MaterialEditText
android:id="#+id/converter_ruble_edit_text"
style="#style/RateEditText"
android:hint="#string/description_currency_ruble"
app:met_baseColor="#android:color/black"
app:met_bottomTextSize="#dimen/density_font_size_text_converter"
app:met_errorColor="#color/red_light"
app:met_floatingLabel="normal"
app:met_floatingLabelAlwaysShown="true"
app:met_floatingLabelTextSize="#dimen/density_font_size_text_converter"
app:met_helperText=""
app:met_primaryColor="#color/red_light"
app:met_textColorHint="#android:color/transparent"/>
<com.rengwuxian.materialedittext.MaterialEditText
android:id="#+id/converter_dollar_edit_text"
style="#style/RateEditText"
android:hint="#string/description_currency_dollar"
app:met_baseColor="#android:color/black"
app:met_bottomTextSize="#dimen/density_font_size_text_converter"
app:met_errorColor="#color/red_light"
app:met_floatingLabel="normal"
app:met_floatingLabelAlwaysShown="true"
app:met_floatingLabelTextSize="#dimen/density_font_size_text_converter"
app:met_helperText=""
app:met_primaryColor="#color/red_light"
app:met_textColorHint="#android:color/transparent"/>
<com.rengwuxian.materialedittext.MaterialEditText
android:id="#+id/converter_euro_edit_text"
style="#style/RateEditText"
android:hint="#string/description_currency_euro"
app:met_baseColor="#android:color/black"
app:met_bottomTextSize="#dimen/density_font_size_text_converter"
app:met_errorColor="#color/red_light"
app:met_floatingLabel="normal"
app:met_floatingLabelAlwaysShown="true"
app:met_floatingLabelTextSize="#dimen/density_font_size_text_converter"
app:met_helperText=""
app:met_primaryColor="#color/red_light"
app:met_textColorHint="#android:color/transparent"/>
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
</ScrollView>
<android.support.design.widget.FloatingActionButton
android:id="#+id/update_floating_action_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/density_spacing_size_floating_action_button"
android:layout_marginRight="#dimen/float_action_button_spacing_8"
android:src="#drawable/ic_cached_white_24dp"
app:fabSize="mini"
app:layout_anchor="#id/behavior_card_view"
app:pressedTranslationZ="6dp"
app:layout_anchorGravity="end|right|center"
/>
</android.support.design.widget.CoordinatorLayout>

Instead of anchoring to behavior_card_view, try anchoring it to something inside behavior_card_view. Ideally, anchor to the bottom of the USD textview. This should prevent the FAB from sliding down.
I would actually create a invisible layout which I can use to anchor but it doesn't affect the UI otherwise.
I can't replicate the issue you are having but the following works as you want:
<RelativeLayout
android:id="#+id/rl1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingTop="10dp"
android:paddingRight="10dp">
<TextView
android:id="#+id/tv1"
android:layout_width="match_parent"
android:layout_height="100dp"
android:paddingLeft="12dp"
android:text="Setting"
android:focusable="true"
android:focusableInTouchMode="true" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:src="#drawable/ic_add"
app:fabSize="mini"
app:pressedTranslationZ="6dp"
app:layout_anchorGravity="end|right|center"
app:layout_anchor="#id/tv1" />
... a lot of elements here ...
</RelativeLayout>
This RelativeLayout is the only element inside my ScrollView element.