Android why is there no maxHeight for a View

Question

View s have a minHeight but somehow are lacking a maxHeight   What I m trying to achieve is having some items  views  filling up a ScrollView  When there are 1  3 items I want to display them directly  Meaning the ScrollView has the height of either 1  2 or 3 items   When there are 4 or more items I want the ScrollView to stop expanding  thus a maxHeight  and start providing scrolling   However  there is unfortunately no way to set a maxHeight  So I probably have to set my ScrollView height programmatically to either WRAP CONTENT when there are 1  3 items and set the height to 3 sizeOf View  when there are 4 or more items   Can anyone explain why there is no maxHeight provided  when there is already a minHeight     BTW  some views  like ImageView have a maxHeight implemented

User · Answer

As we know devices running android can have different screen sizes. As we further know views should adjust dynamically and become the space which is appropriate.

If you set a max height you maybe force the view not to get enough space or take to less space. I know that sometimes it seems to be practically to set a max height. But if the resolution will ever change dramatically, and it will!, then the view, which has a max height, will look not appropriate.

i think there is no proper way to exactly do the layout you want. i would recommend you to think over your layout using layout managers and relative mechanisms. i don't know what you're trying to achieve but it sounds a little strange for me that a list should only show three items and then the user has to scroll.

btw. minHeight is not guaranteed (and maybe shouldn't exist either). it can have some benefit to force items to be visible while other relative items get smaller.

User · Answer

In order to create a ScrollView or ListView with a maxHeight you just need to create a Transparent LinearLayout around it with a height of what you want the maxHeight to be  You then set the ScrollView s Height to wrap content   This creates a ScrollView that appears to grow until its height is equal to the parent LinearLayout

User · Answer

I know this does not directly answer the question but might be helpful to others looking for maxHeight functionality   ConstraintLayout offers maximum height for its children via  app layout constraintHeight max  300dp  app layout constrainedHeight  true     or  app layout constraintWidth max  300dp  app layout constrainedWidth  true     Sample usage here

User · Answer

As mentioned above  ConstraintLayout offers maximum height for its children via   app layout constraintHeight max  300dp  app layout constrainedHeight  true    Besides  if maximum height for one ConstraintLayout s child is uncertain until App running  there still has a way to make this child automatically adapt a mutable height no matter where it was placed in the vertical chain   For example  we need to show a bottom dialog with a mutable header TextView  a mutable ScrollView and a mutable footer TextView  The dialog s max height is 320dp when total height not reach 320dp ScrollView act as wrap content  when total height exceed ScrollView act as  maxHeight 320dp - header height - footer height    We can achieve this just through xml layout file    lt  xml version  1 0  encoding  utf-8   gt   lt 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  320dp  gt        lt TextView         android id    id tv header          android layout width  match parent          android layout height  wrap content          android background   color black 10          android gravity  center          android padding  10dp          app layout constraintBottom toTopOf   id scroll view          app layout constraintStart toStartOf  parent          app layout constraintTop toTopOf  parent          app layout constraintVertical bias  1          app layout constraintVertical chainStyle  packed          tools text  header    gt        lt ScrollView         android id    id scroll view          android layout width  match parent          android layout height  wrap content          android background   color black 30          app layout constrainedHeight  true          app layout constraintBottom toTopOf   id tv footer          app layout constraintHeight max  300dp          app layout constraintStart toStartOf  parent          app layout constraintTop toBottomOf   id tv header  gt            lt LinearLayout             android id    id ll container              android layout width  match parent              android layout height  wrap content              android orientation  vertical  gt                lt TextView                 android id    id tv sub1                  android layout width  match parent                  android layout height  160dp                  android gravity  center                  android textColor   color orange light                  tools text  sub1    gt                lt TextView                 android id    id tv sub2                  android layout width  match parent                  android layout height  160dp                  android gravity  center                  android textColor   color orange light                  tools text  sub2    gt            lt  LinearLayout gt       lt  ScrollView gt        lt TextView         android id    id tv footer          android layout width  match parent          android layout height  wrap content          android background   color black 50          android gravity  center          android padding  10dp          app layout constraintBottom toBottomOf  parent          app layout constraintStart toStartOf  parent          app layout constraintTop toBottomOf   id scroll view          tools text  footer    gt   lt  android support constraint ConstraintLayout gt    Most import code is short   app layout constraintVertical bias  1  app layout constraintVertical chainStyle  packed   app layout constrainedHeight  true    Horizontal maxWidth usage is quite the same

User · Answer

My MaxHeightScrollView custom view  public class MaxHeightScrollView extends ScrollView       private int maxHeight       public MaxHeightScrollView Context context            this context  null              public MaxHeightScrollView Context context  AttributeSet attrs            this context  attrs  0              public MaxHeightScrollView Context context  AttributeSet attrs  int defStyleAttr            super context  attrs  defStyleAttr           init context  attrs              private void init Context context  AttributeSet attrs            TypedArray styledAttrs                   context obtainStyledAttributes attrs  R styleable MaxHeightScrollView           try               maxHeight   styledAttrs getDimensionPixelSize R styleable MaxHeightScrollView mhs maxHeight  0             finally               styledAttrs recycle                          Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            if  maxHeight  gt  0                heightMeasureSpec   MeasureSpec makeMeasureSpec maxHeight  MeasureSpec AT MOST                     super onMeasure widthMeasureSpec  heightMeasureSpec             style xml   lt declare-styleable name  MaxHeightScrollView  gt       lt attr name  mhs maxHeight  format  dimension    gt   lt  declare-styleable gt    Using   lt     MaxHeightScrollView     android layout width  wrap content      android layout height  wrap content      app mhs maxHeight  100dp       gt             lt      MaxHeightScrollView gt

User · Answer

if you guys want to make a non-overflow scrollview or listview  just but it on a RelativeLayout with a topview and bottomview on top and bottom for it     lt ScrollView     android layout width  match parent      android layout height  wrap content      android layout above    id topview      android layout below    id bottomview   gt

User · Answer

I have an answer here   https   stackoverflow com a 29178364 1148784  Just create a new class extending ScrollView and override it s onMeasure method        Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            if  maxHeight  gt  0               int hSize   MeasureSpec getSize heightMeasureSpec               int hMode   MeasureSpec getMode heightMeasureSpec                switch  hMode                   case MeasureSpec AT MOST                      heightMeasureSpec   MeasureSpec makeMeasureSpec Math min hSize  maxHeight   MeasureSpec AT MOST                       break                  case MeasureSpec UNSPECIFIED                      heightMeasureSpec   MeasureSpec makeMeasureSpec maxHeight  MeasureSpec AT MOST                       break                  case MeasureSpec EXACTLY                      heightMeasureSpec   MeasureSpec makeMeasureSpec Math min hSize  maxHeight   MeasureSpec EXACTLY                       break                                   super onMeasure widthMeasureSpec  heightMeasureSpec

User · Answer

This worked for me to make it customizable in xml   MaxHeightScrollView java   public class MaxHeightScrollView extends ScrollView    private int maxHeight  private final int defaultHeight   200   public MaxHeightScrollView Context context        super context      public MaxHeightScrollView Context context  AttributeSet attrs        super context  attrs       if   isInEditMode              init context  attrs            public MaxHeightScrollView Context context  AttributeSet attrs  int defStyleAttr        super context  attrs  defStyleAttr       if   isInEditMode              init context  attrs             TargetApi Build VERSION CODES LOLLIPOP  public MaxHeightScrollView Context context  AttributeSet attrs  int defStyleAttr  int defStyleRes        super context  attrs  defStyleAttr  defStyleRes       if   isInEditMode              init context  attrs            private void init Context context  AttributeSet attrs        if  attrs    null            TypedArray styledAttrs   context obtainStyledAttributes attrs  R styleable MaxHeightScrollView             200 is a defualt value         maxHeight   styledAttrs getDimensionPixelSize R styleable MaxHeightScrollView maxHeight  defaultHeight            styledAttrs recycle              Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        heightMeasureSpec   MeasureSpec makeMeasureSpec maxHeight  MeasureSpec AT MOST       super onMeasure widthMeasureSpec  heightMeasureSpec         attr xml   lt declare-styleable name  MaxHeightScrollView  gt           lt attr name  maxHeight  format  dimension    gt       lt  declare-styleable gt    example layout   lt blah blah MaxHeightScrollView android layout weight  1                  app maxHeight  90dp                  android layout width  fill parent                  android layout height  wrap content  gt                   lt EditText android id    id commentField                      android hint  Say Something                      android background   FFFFFF                      android paddingLeft  8dp                      android paddingRight  8dp                      android gravity  center vertical                      android maxLines  500                      android minHeight  36dp                      android layout width  fill parent                      android layout height  wrap content    gt               lt  blah blah MaxHeightScrollView gt

User · Answer

I would have commented on whizzle s answer if I could  but thought it useful to note that in order for me to solve this problem in the context of multi-window mode in Android N  I needed to change the code slightly to this    Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        if MeasureSpec getSize heightMeasureSpec   gt  maxHeight            heightMeasureSpec   MeasureSpec makeMeasureSpec maxHeight  MeasureSpec AT MOST             super onMeasure widthMeasureSpec  heightMeasureSpec       This allows for the layout to resize to be smaller than the max height  but also prevent it from being larger than the max height  I used this is a layout class that Overrides RelativeLayout and this allowed me to create a custom dialog with a ScrollView as the child of MaxHeightRelativeLayout that does not expand the full height of the screen and also shrinks to fit within the smallest widow size in multi-window for Android N

User · Answer

i think u can set the heiht at runtime for 1 item just scrollView setHeight 200px   for 2 items scrollView setheight 400px  for 3 or more scrollView setHeight 600px

User · Answer

Wrap your ScrollView around your a plainLinearLayout with layout height  max height   this will do a perfect job  In fact  I have this code in production from last 5 years with zero issues    lt LinearLayout         android id    id subsParent          android layout width  match parent          android layout height  150dp          android gravity  bottom center horizontal          android orientation  vertical  gt            lt ScrollView             android id    id subsScroll              android layout width  wrap content              android layout height  wrap content              android layout marginBottom  10dp              android layout marginEnd  15dp              android layout marginStart  15dp  gt                lt TextView                 android id    id subsTv                  android layout width  wrap content                  android layout height  wrap content                  android text   string longText                  android visibility  visible    gt            lt  ScrollView gt       lt  LinearLayout gt

User · Answer

I used a custom ScrollView made in Kotlin which uses maxHeight  Example of use    lt com antena3 atresplayer tv ui widget ScrollViewWithMaxHeight     android layout width  match parent      android layout height  wrap content      android maxHeight  100dp  gt        lt LinearLayout         android layout width  match parent          android layout height  wrap content  gt            lt TextView             android layout width  wrap content              android layout height  wrap content   gt   lt  com antena3 atresplayer tv ui widget ScrollViewWithMaxHeight gt    Here is the code of ScrollViewWidthMaxHeight   import android content Context import android util AttributeSet import android widget ScrollView import timber log Timber  class ScrollViewWithMaxHeight  JvmOverloads constructor      context  Context      attrs  AttributeSet    null      defStyleAttr  Int   0     ScrollView context  attrs  defStyleAttr     companion object       var WITHOUT MAX HEIGHT VALUE   -1    private var maxHeight   WITHOUT MAX HEIGHT VALUE  init       val a   context obtainStyledAttributes          attrs  R styleable ScrollViewWithMaxHeight          defStyleAttr  0           try           maxHeight   a getDimension              R styleable ScrollViewWithMaxHeight android maxHeight              WITHOUT MAX HEIGHT VALUE toFloat             toInt         finally           a recycle            override fun onMeasure widthMeasureSpec  Int  heightMeasureSpec  Int        var heightMeasure   heightMeasureSpec     try           var heightSize   MeasureSpec getSize heightMeasureSpec          if  maxHeight    WITHOUT MAX HEIGHT VALUE                heightSize   maxHeight             heightMeasure   MeasureSpec makeMeasureSpec heightSize  MeasureSpec AT MOST            else               heightMeasure   MeasureSpec makeMeasureSpec heightSize  MeasureSpec UNSPECIFIED                    layoutParams height   heightSize       catch  e  Exception            Timber e e   Error forcing height         finally           super onMeasure widthMeasureSpec  heightMeasure           fun setMaxHeight maxHeight  Int        this maxHeight   maxHeight       which needs also this declaration in values attrs xml    lt  xml version  1 0  encoding  utf-8   gt   lt resources gt   lt declare-styleable name  ScrollViewWithMaxHeight  gt           lt attr name  android maxHeight    gt       lt  declare-styleable gt   lt  resources gt

User · Answer

None of these solutions worked for what I needed which was a ScrollView set to wrap content but having a maxHeight so it would stop expanding after a certain point and start scrolling  I just simply overrode the onMeasure method in ScrollView     Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        heightMeasureSpec   MeasureSpec makeMeasureSpec 300  MeasureSpec AT MOST       super onMeasure widthMeasureSpec  heightMeasureSpec       This might not work in all situations  but it certainly gives me the results needed for my layout  And it also addresses the comment by madhu      If some layout present below the scrollview then this trick wont work      madhu Mar 5 at 4 36

User · Answer

There is no way to set maxHeight  But you can set the Height   To do that you will need to discovery the height of each item of you scrollView  After that just set your scrollView height to numberOfItens   heightOfItem   To discovery the height of an item do that   View item   adapter getView 0  null  scrollView   item measure 0  0   int heightOfItem   item getMeasuredHeight      To set the height do that      if the scrollView already has a layoutParams  scrollView getLayoutParams   height   heightOfItem   numberOfItens     or    if the layoutParams is null  then create a new one  scrollView setLayoutParams new LayoutParams LayoutParams FILL PARENT  heightOfItem   numberOfItens

User · Answer

Have you tried using the layout weight value   If you set one it to a value greater than 0  it will stretch that view into the remaining space available   If you had multiple views that needed to be stretched  then the value will become a weight between them   So if you had two views both set to a layout weight value of 1  then they would both stretch to fill in the space but they would both stretch to an equal amount of space   If you set one of them to the value of 2  then it would stretch twice as much as the other view   Some more info here listed under Linear Layout

User · Answer

First get the item height in pixels  View rowItem   adapter getView 0  null  scrollView      rowItem measure 0  0       int heightOfItem   rowItem getMeasuredHeight      then simply   Display display   getWindowManager   getDefaultDisplay        DisplayMetrics displayMetrics   new DisplayMetrics        display getMetrics displayMetrics       scrollView getLayoutParams   height    int   heightOfItem   3  displayMetrics  density

User · Answer

If anyone is considering using exact value for LayoutParams e g   setLayoutParams new LayoutParams Y  X      Do remember to take into account the density of the device display otherwise you might get very odd behaviour on different devices  E g   Display display   getWindowManager   getDefaultDisplay    DisplayMetrics d   new DisplayMetrics    display getMetrics d   setLayoutParams new LayoutParams LayoutParams WRAP CONTENT   int  50 d density

[android] Android: why is there no maxHeight for a View?

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