Develop Reference

Add animation for Changing Height of Layout

I have a small view, which at the beginning only contains a loading indicator, which is why it is relatively small. However, when the actual content is loaded, I would like to display that instead of the loading indicator, for which I add 2 text fields and an ImageView. Currently I just do this by hiding the ProgressBar and showing the elements I just mentioned, but this way there is a hard cut between the two states. I would like to change this so that first the height of the view is adjusted over a short period of time, and then the content is shown (maby faded in, but I'm more concerned about changing the height).
In general I already have some ideas how to do this, but I don't know how to calculate the new height? Is there a way to calculate it, or even a function directly from Android that solves my Problem?
Thanks already :)^
Heres the Layout for the Fragment:
<?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/home_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".viewables.fragments.home.HomeFragment">
<ListView
android:id="#+id/home_vertretungsplan_preview"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:listitem="#layout/vertretungsplan_list_item"/>
<include
android:animateLayoutChanges="true"
android:layout_weight="0"
android:id="#+id/home_article_preview"
layout="#layout/thomsline_main_recyclerview_article"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp" />
</LinearLayout>
and here ist the Included Layout
<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.card.MaterialCardView
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:animateLayoutChanges="true"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:clickable="true"
android:focusable="true"
app:cardElevation="10dp"
app:cardCornerRadius="20dp"
app:cardPreventCornerOverlap="false">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/thomsline_post_image"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_margin="0dp"
android:adjustViewBounds="true"
android:padding="0dp"
android:scaleType="centerCrop"
android:src="#drawable/img_thomsline_article_image_default"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="20dp"
android:id="#+id/container1"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#id/thomsline_post_image"
app:layout_constraintLeft_toLeftOf="parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="19sp"
android:id="#+id/thomsline_post_title"
tools:text="Article Title"/>
<TextView
android:id="#+id/thomsline_post_excerpt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:textAllCaps="false"
android:textSize="12.5sp"
tools:text="Post Excerpt" />
</LinearLayout>
<ProgressBar
android:id="#+id/thomsline_post_loading_indicator"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:visibility="gone"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.card.MaterialCardView>

You can try using animateLayoutChanges attribute in your parent layout.
Add this line to your root element of your activity layout :
android:animateLayoutChanges="true"
Or you can use TransitionManager for smooth transitions. (API 19+)
Add this code to your file just before the line where you set your content :
TransitionManager.beginDelayedTransition(cardView); //Default transition
You can pass your preferred transition to this function like this :
Transition transition = new ChangeBounds();
TransitionManager.beginDelayedTransition(cardView,transition);
You can choose any transition :
ChangeBounds
Explode
Slide
Fade
AutoTransition
TransitionSet
If you want to know more about animations in android, i would suggest u read this : Simple Animations in Android

How to make scrollable Items within a scrollable listview?

I have small database which populates data into a listview which uses other layout as provided below to show the data.
What happens is if the 1st field's text is more than two lines, the text starts hiding. So I thought i would make that listview's each row scrollable. Though it shows a scroll bar but nothing happens.
This is the layout which is used by listview
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
android:layout_height="75dp"
android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="75dp"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:id="#+id/desc_d"
android:layout_width="165dp"
android:layout_height="match_parent"
android:layout_alignParentStart="true"
android:text="Description"
android:gravity="center"
android:textAppearance="#android:style/TextAppearance.Large"/>
<TextView
android:id="#+id/cate_d"
android:layout_width="70dp"
android:layout_height="match_parent"
android:gravity="center"
android:layout_toEndOf="#id/desc_d"
android:text="others"
android:textAppearance="#android:style/TextAppearance.Large" />
<TextView
android:id="#+id/date_d"
android:layout_width="70dp"
android:layout_height="match_parent"
android:gravity="center"
android:layout_toEndOf="#id/cate_d"
android:text="16/11/2017"
android:textAppearance="#android:style/TextAppearance.Large" />
<TextView
android:id="#+id/amt_d"
android:layout_width="80dp"
android:layout_height="match_parent"
android:gravity="center"
android:layout_toEndOf="#id/date_d"
android:text="100000"
android:textAppearance="#android:style/TextAppearance.Large" />
</RelativeLayout>
</ScrollView>
My MainActivity layout has a listview which is also scrollable and uses above layout.
<?xml version="1.0" encoding="utf-8"?>
<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">
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="beforeDescendants"
android:focusableInTouchMode="true"
android:keepScreenOn="false"
android:scrollbarAlwaysDrawHorizontalTrack="false"
android:scrollbarAlwaysDrawVerticalTrack="false"
tools:context="apps.harry.expensedata.MainActivity">
<Button
android:id="#+id/add_expense_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="24dp"
android:layout_marginTop="24dp"
android:onClick="addExpenseClick"
android:text="#string/button_1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/view_expense_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="24dp"
android:onClick="viewClick"
android:text="#string/button_2"
app:layout_constraintStart_toEndOf="#+id/add_expense_btn"
app:layout_constraintTop_toTopOf="parent" />
<RelativeLayout
android:id="#+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="406dp"
android:layout_marginTop="84dp"
app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteX="0dp">
<ListView
android:id="#+id/list_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="248dp" />
</RelativeLayout>
</android.support.constraint.ConstraintLayout>
</ScrollView>
Here's the screen shot of the APP
As you can see there's a scroll bar available for each row in that layout, but nothing happens when I scroll.Please suggest me how this could be achieved.

This is not a solution suggestion for your scrolling problem, but due to user experience you should consider to not habe scrollable list items inside a scrollable list.
See Material Guidelines for this. Here is a little excerpt.
List tiles may contain up to three lines of text, and text length may vary between tiles in the same list. To display more than three lines of text, use a card.
Place the most distinguishing content on the left of the tile and the least distinguishing content on the right.
Specifications:
The majority of space on a list tile should be dedicated to the primary action
Place the most distinguishing content towards the left of the tile
In tiles with multi-line content, place the most distinguishing content in the first line
Place supplemental actions on the right side

Try using maxLines and minLines as attributes for the TextView to accommodate all the data.

Make scrollView Height="wrap_content" instead of fixed size. maybe useful

Google defined in their guidelines do not use scrollview inside of scrollview and it is more then simply guidelines it doesnt work properly. and you see that case. Tbe solution is set to your listitem height as wrap_content and the best practices is as was mentioned above do not use listitems with more than 2-3 lines of text. take a look into materisl design guide to see the dimensions of list items

I would suggest you to can change your custom list item height to wrap_content and then you don't need scrolling.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="horizontal"
android:padding="10dp">
<TextView
android:id="#+id/decription"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:hint="decription" />
<TextView
android:id="#+id/whatFor"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:hint="whatFor" />
<TextView
android:id="#+id/date"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:hint="date" />
<TextView
android:id="#+id/amount"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:hint="amount" />
</LinearLayout>
Your output will be like below image.
I hope your issue will be resolved and if you still have any query then please ask.

MvxRecyclerView is being drawn under other elements

What I have so far
I have a recyclerview and buttons below it. On initial state everything looks good: recyclerview makes space for a button and I can scroll down to the end of the list and the last item won't be hidden by the button. When I pick one of the items, one button becomes invisible and other buttons become visible.
Actual behavior
When buttons change their visibility, recyclerview fills parent, so part of the content is being hidden under the recently appeared buttons.
Expected behavior
I expect that recyclerview will shrink its height leaving some space for the buttons.
What I've tried to do
I've tried to apply this to a swiperefreshlayout:
android:layout_height="0dp"
android:layout_weight="1"
but now recyclerview will just disappear when first button hides and others show up.
Layout
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_height="match_parent"
android:layout_width="match_parent">
<include
layout="#layout/toolbar_actionbar" />
<TextView
android:gravity="center"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:layout_centerInParent="true"
android:layout_gravity="center|center"
android:maxLines="10"
android:textSize="20dp"
local:MvxBind="Text EmptyMessage;Visibility Visibility(ShowEmptyMessage)" />
<MvvmCross.Droid.Support.V4.MvxSwipeRefreshLayout
android:id="#+id/timeslotsSwipeRefresh"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/getTimeslotButton"
android:layout_below="#+id/appbar"
local:layout_behavior="#string/appbar_scrolling_view_behavior"
local:MvxBind="Refreshing IsRefreshingTimeslots; RefreshCommand RefreshTimeslotsCommand">
<!-- Here is my recycler view -->
<MvxRecyclerView
android:id="#+id/MyTimeslotsRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
local:MvxBind="ItemsSource Timeslots;Visibility Visibility(ShowList)"
local:MvxItemTemplate="#layout/item_my_timeslot" />
</MvvmCross.Droid.Support.V4.MvxSwipeRefreshLayout>
<!-- Here is my disappearing button -->
<android.support.v7.widget.AppCompatButton
android:id="#+id/getTimeslotButton"
android:text="Получить таймслоты"
android:theme="#style/ButtonPrimary"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_alignParentBottom="true"
local:MvxBind="Click GetTimeslotsCommand; Visibility InvertedVisibility(IsEditModeEnabled)" />
<!-- Here are my appearing buttons.
I placed it inside of a relativelayout
to make a single visibility data binding -->
<RelativeLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_alignParentBottom="true"
local:MvxBind="Visibility Visibility(IsEditModeEnabled)">
<android.support.v7.widget.AppCompatButton
android:id="#+id/copyToSmsButton"
android:text="Отправить по SMS"
android:theme="#style/ButtonPrimary"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_marginBottom="0dp"
android:layout_alignParentLeft="true"/>
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_below="#id/copyToSmsButton">
<android.support.v7.widget.AppCompatButton
android:id="#+id/deleteTimeslotButton"
android:text="Удалить"
android:theme="#style/ButtonSecondary.Red"
android:layout_marginTop="0dp"
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"/>
<android.support.v7.widget.AppCompatButton
android:id="#+id/moveTimeslotButton"
android:text="Перенести"
android:theme="#style/ButtonSecondary"
android:layout_marginTop="0dp"
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"/>
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>

Is it possible to make the first view in ScrollView match dimensions to screen?

I was able to this somehow using RecyclerView. When I create a view for a specific item in my RecyclerView, the recyclerview item layout is matched to parent.
I am wondering if this is also possible using ScrollView?
Here's what I did so far:
ScrollView xml:
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/scrollview_homescreen"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<LinearLayout
android:id="#+id/linearlayout_homescreen"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include layout="#layout/listitem_comic_menu"/>
<LinearLayout
android:id="#+id/linearlayout_comic_listings"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
</LinearLayout>
</LinearLayout>
</ScrollView>
Content:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relativelayout_homescreen"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/imageview_menu_bg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:adjustViewBounds="true" />
<ImageView
android:id="#+id/imageview_menu_title_bg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/starwars_webtoon_home_1_logo"
android:scaleType="fitXY"
android:adjustViewBounds="true" />
<Button
android:id="#+id/button_start_reading"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_above="#+id/button_menu"
android:layout_marginBottom="18dp"
android:text="#string/button_start_reading"
android:gravity="start"
android:drawableRight="#drawable/ic_keyboard_arrow_right_black_24dp"
android:drawableEnd="#drawable/ic_keyboard_arrow_right_black_24dp"
android:background="#drawable/button_bg"
android:textSize="18sp"
android:layout_marginStart="12dp"
android:layout_marginLeft="12dp"
android:layout_marginEnd="12dp"
android:layout_marginRight="12dp" />
<Button
android:id="#id/button_menu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:layout_marginBottom="28dp"
android:text="#string/button_menu"
android:textSize="18sp"
android:textColor="#FFFFFF"
android:drawableLeft="#drawable/ic_menu_white_24dp"
android:drawableStart="#drawable/ic_menu_white_24dp"
android:background="?android:attr/selectableItemBackground" />
</RelativeLayout>
So what am I trying to do? Basically this is for comic listing. The first item should be the homescreen, a couple of button here and there and the entire application logo. The next item should show the listings (I have 40 items of the same width and height) and a footer.
I need my homescreen to match the parent which is the screen. So when I scroll the topmost part, the first item (the first view, which is the homescreen) fills the entire devices screen.
I was able to to do this on RecyclerView and looks nice. I have encountered some of problems that plague me which I have to fix extensively to the point that I am hacking through the system and I realize RecyclerView is not really the best layout for this kind of case. I am currently deciding whether to switch to ScrollView and dynamically/statically add the comic items. But, the homescreen, which is the first View is not matching the screen device.
I would just like to ask if this possible at all to do in ScrollView?
Thanks!

Use weight attribute:
<LinearLayout
android:id="#+id/linearlayout_homescreen"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<include layout="#layout/listitem_comic_menu"/>
<LinearLayout
android:id="#+id/linearlayout_comic_listings"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
</LinearLayout>
</LinearLayout>

Anchoring Views together Android

I want to implement view anchoring, I have a Horizontal ScrollView which I want to anchor to a button, the button files the screen width, in the ScrollView is a linearlayout with images, I want the Images to be looking like they are pass on the Button, I want to make something like how a Fab manages to anchor between view except I do not know where to start, Fab has attributes like app:layout_anchor="#+id/appbar"
app:layout_anchorGravity="bottom|right|end"
which make it very easy to anchor it, I once tried implementing anchoring but on Big screens it was cutting off from the anchor, below is my XML layout
<FrameLayout
style="#style/commonListItemStyle"
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"
android:background="#android:color/transparent">
<FrameLayout
android:id="#+id/container"
android:paddingTop="4dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:paddingBottom="4dp"
android:foreground="?attr/selectableItemBackground">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<HorizontalScrollView
android:layout_width="match_parent"
android:scrollbars="none"
android:id="#+id/scrollView"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/imageHolder"
android:orientation="horizontal">
<ImageView
android:layout_width="70dp"
android:layout_height="70dp"
android:src="#drawable/clothes"/>
</LinearLayout>
</HorizontalScrollView>
<android.support.v7.widget.CardView
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="wrap_content"
app:cardCornerRadius="2dp"
app:cardElevation="1dp"
android:layout_below="#+id/scrollView"
app:cardMaxElevation="2dp"
app:cardUseCompatPadding="true"
android:id="#+id/relativeLayout">
<LinearLayout
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_height="wrap_content">
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Add New Item"
android:textStyle="bold"
android:id="#+id/addNewItem"
android:textSize="16sp"
style="?android:buttonBarButtonStyle"
android:textColor="#color/google_darkblue"
android:layout_weight="1"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
</RelativeLayout>
</FrameLayout>
</FrameLayout>
So I will give an example of Gem Player here https://android-arsenal.com/details/3/2679 I want the HorizontalScrollview to act like the Fab and the Button to act like the red view anchoring the fab, I want when Images are being scrolled within the Horizontal scrollview to look like they are halfway on the Button, I want the user to feel like the image is on the button.