Android I am unable to have ViewPager WRAP CONTENT

Question

I have setup a simple ViewPager that has an ImageView with a height of 200dp on each page   Here is my pager   pager   new ViewPager this   pager setLayoutParams new LayoutParams LayoutParams FILL PARENT  LayoutParams WRAP CONTENT    pager setBackgroundColor Color WHITE   pager setOnPageChangeListener listener   layout addView pager     Despite the height set as wrap content  the pager always fills the screen even though the imageview is only 200dp  I tried to replace the height of the pager with  200  but that gives me different results with multiple resolutions  I am unable to add  dp  to that value  How do I add 200dp to the pager s layout

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I also ran into this problem  but in my case I had a FragmentPagerAdapter that was supplying the ViewPager with its pages  The problem I had was that onMeasure   of the ViewPager was called before any of the Fragments had been created  and therefore could not size itself correctly    After a bit of trial and error  I found that the finishUpdate   method of the FragmentPagerAdapter is called after the Fragments have been initialized  from instantiateItem   in the FragmentPagerAdapter   and also after during the page scrolling  I made a small interface   public interface AdapterFinishUpdateCallbacks       void onFinishUpdate        which I pass into my FragmentPagerAdapter and call    Override public void finishUpdate ViewGroup container        super finishUpdate container        if  this listener    null                this listener onFinishUpdate              which in turn allows me to call setVariableHeight   on my CustomViewPager implementation   public void setVariableHeight            super measure   calls finishUpdate   in adapter  so need this to stop infinite loop     if   this isSettingHeight                this isSettingHeight   true           int maxChildHeight   0          int widthMeasureSpec   MeasureSpec makeMeasureSpec getMeasuredWidth    MeasureSpec EXACTLY           for  int i   0  i  lt  getChildCount    i                          View child   getChildAt i               child measure widthMeasureSpec  MeasureSpec makeMeasureSpec ViewGroup LayoutParams WRAP CONTENT  MeasureSpec UNSPECIFIED                maxChildHeight   child getMeasuredHeight    gt  maxChildHeight   child getMeasuredHeight     maxChildHeight                     int height   maxChildHeight   getPaddingTop     getPaddingBottom            int heightMeasureSpec   MeasureSpec makeMeasureSpec height  MeasureSpec EXACTLY            super measure widthMeasureSpec  heightMeasureSpec           requestLayout             this isSettingHeight   false            I am not sure it is the best approach  would love comments if you think it is good bad evil  but it seems to be working pretty well in my implementation     Hope this helps someone out there   EDIT  I forgot to add a requestLayout   after calling super measure    otherwise it doesn t redraw the view    I also forgot to add the parent s padding to the final height   I also dropped keeping the original width height MeasureSpecs in favor of creating a new one as required  Have updated the code accordingly   Another problem I had was that it wouldn t size itself correctly in a ScrollView and found the culprit was measuring the child with MeasureSpec EXACTLY instead of MeasureSpec UNSPECIFIED  Updated to reflect this   These changes have all been added to the code  You can check the history to see the old  incorrect  versions if you want

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When using static content inside the viewpager and you wish no fancy animation you may use the following view pager  public class HeightWrappingViewPager extends ViewPager      public HeightWrappingViewPager Context context        super context          public HeightWrappingViewPager Context context  AttributeSet attrs        super context  attrs           Override   protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            super onMeasure widthMeasureSpec  heightMeasureSpec         View firstChild   getChildAt 0         firstChild measure widthMeasureSpec  heightMeasureSpec         super onMeasure widthMeasureSpec  MeasureSpec makeMeasureSpec firstChild getMeasuredHeight    MeasureSpec EXACTLY

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If the ViewPager you re using is a child of a ScrollView AND has a PagerTitleStrip child you ll need to use a slight modification of the great answers already provided  For reference my XML looks like this    lt ScrollView     android id    id match scroll view      android layout width  fill parent      android layout height  fill parent      android background   color white  gt        lt LinearLayout         android id    id match and graphs wrapper          android layout width  match parent          android layout height  wrap content          android orientation  vertical  gt            lt view             android id    id pager              class  com printandpixel lolhistory util WrapContentHeightViewPager              android layout width  match parent              android layout height  wrap content  gt                lt android support v4 view PagerTitleStrip                 android id    id pager title strip                  android layout width  match parent                  android layout height  wrap content                  android layout gravity  top                  android background   33b5e5                  android paddingBottom  4dp                  android paddingTop  4dp                  android textColor   fff    gt           lt  view gt       lt  LinearLayout gt   lt  ScrollView gt    In your onMeasure you have to ADD the measuredHeight of the PagerTitleStrip if one is found  Otherwise its height won t be considered into the largest height of all the children even though it takes up additional space   Hope this helps someone else  Sorry that it s a bit of a hack     public class WrapContentHeightViewPager extends ViewPager        public WrapContentHeightViewPager Context context            super context              public WrapContentHeightViewPager Context context  AttributeSet attrs            super context  attrs               Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            int pagerTitleStripHeight   0          int height   0          for int i   0  i  lt  getChildCount    i                  View child   getChildAt i               child measure widthMeasureSpec  MeasureSpec makeMeasureSpec 0  MeasureSpec UNSPECIFIED                int h   child getMeasuredHeight                if  h  gt  height                       get the measuredHeight of the tallest fragment                 height   h                            if  child getClass      PagerTitleStrip class                       store the measured height of the pagerTitleStrip if one is found  This will only                    happen if you have a android support v4 view PagerTitleStrip as a direct child                    of this class in your XML                  pagerTitleStripHeight   h                                   heightMeasureSpec   MeasureSpec makeMeasureSpec height pagerTitleStripHeight  MeasureSpec EXACTLY            super onMeasure widthMeasureSpec  heightMeasureSpec

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I have an version of WrapContentHeightViewPager that was working correctly before API 23 that will resize the parent view s height base on the current child view selected   After upgrading to API 23  it stopped working  It turns out the old solution was using getChildAt getCurrentItem    to get the current child view to measure which is not working  See solution here  https   stackoverflow com a 16512217 1265583  Below works with API 23    Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        super onMeasure widthMeasureSpec  heightMeasureSpec       int height   0      ViewPagerAdapter adapter    ViewPagerAdapter getAdapter        View child   adapter getItem getCurrentItem    getView        if child    null            child measure widthMeasureSpec   MeasureSpec makeMeasureSpec 0  MeasureSpec UNSPECIFIED            height   child getMeasuredHeight              heightMeasureSpec   MeasureSpec makeMeasureSpec height  MeasureSpec EXACTLY        super onMeasure widthMeasureSpec  heightMeasureSpec

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Another Kotlin code  class DynamicViewPager  JvmOverloads constructor      context  Context      attrs  AttributeSet    null     ViewPager context  attrs         override fun onMeasure widthMeasureSpec  Int  heightMeasureSpec  Int            var height   0          0 until childCount  forEach               val child   getChildAt it              child measure                  widthMeasureSpec                  MeasureSpec makeMeasureSpec 0  MeasureSpec UNSPECIFIED                            height   max height  child measuredHeight                    if  height  gt  0                super onMeasure                  widthMeasureSpec                  MeasureSpec makeMeasureSpec height  MeasureSpec EXACTLY                          else               super onMeasure widthMeasureSpec  heightMeasureSpec

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In case you need ViewPager that adjust its size to every child  not just to biggest one  I have wrote a piece of code that does it  Note that there is no animation upon that change  not neccessary in my case   android minHeight flag is also supported   public class ChildWrappingAdjustableViewPager extends ViewPager       List lt Integer gt  childHeights   new ArrayList lt  gt  getChildCount         int minHeight   0      int currentPos   0       public ChildWrappingAdjustableViewPager  NonNull Context context            super context           setOnPageChangeListener               public ChildWrappingAdjustableViewPager  NonNull Context context   Nullable AttributeSet attrs            super context  attrs           obtainMinHeightAttribute context  attrs           setOnPageChangeListener                Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec                        childHeights clear               calculate child views         for  int i   0  i  lt  getChildCount    i                  View child   getChildAt i               child measure widthMeasureSpec  MeasureSpec makeMeasureSpec 0  MeasureSpec UNSPECIFIED                int h   child getMeasuredHeight                if  h  lt  minHeight                    h   minHeight                            childHeights add i  h                      if  childHeights size   - 1  gt   currentPos                heightMeasureSpec   MeasureSpec makeMeasureSpec childHeights get currentPos   MeasureSpec EXACTLY                     super onMeasure widthMeasureSpec  heightMeasureSpec              private void obtainMinHeightAttribute  NonNull Context context   Nullable AttributeSet attrs            int   heightAttr   new int   android R attr minHeight           TypedArray typedArray   context obtainStyledAttributes attrs  heightAttr           minHeight   typedArray getDimensionPixelOffset 0  -666           typedArray recycle               private void setOnPageChangeListener             this addOnPageChangeListener new SimpleOnPageChangeListener                  Override             public void onPageSelected int position                    currentPos   position                   ViewGroup LayoutParams layoutParams   ChildWrappingAdjustableViewPager this getLayoutParams                    layoutParams height   childHeights get position                   ChildWrappingAdjustableViewPager this setLayoutParams layoutParams                   ChildWrappingAdjustableViewPager this invalidate

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Measure the height of ViewPager   public class WrapViewPager extends ViewPager       View primaryView       public WrapViewPager Context context  AttributeSet attrs            super context  attrs               Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            super onMeasure widthMeasureSpec  heightMeasureSpec           if  primaryView    null                int height   0              for  int i   0  i  lt  getChildCount    i                      if  primaryView    getChildAt i                         int childHeightSpec   MeasureSpec makeMeasureSpec 0x1  lt  lt  30 - 1  MeasureSpec AT MOST                       getChildAt i  measure widthMeasureSpec  childHeightSpec                       height   getChildAt i  getMeasuredHeight                                                  setMeasuredDimension widthMeasureSpec  MeasureSpec makeMeasureSpec height  MeasureSpec EXACTLY                         public void setPrimaryView View view            primaryView   view             call setPrimaryView View     public class ZGAdapter extends PagerAdapter         Override     public void setPrimaryItem  NonNull ViewGroup container  int position   NonNull Object object            super setPrimaryItem container  position  object             WrapViewPager container  setPrimaryView  View object

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Another more generic solution is to get wrap content to just work   I ve extended ViewPager to override onMeasure    The height is wraped around the first child view  This could lead to unexpected results if the child views are not exactly the same height  For that the class can be easily extended to let s say animate to the size of the current view page  But I didn t need that   You can use this ViewPager in yout XML layouts just like the original ViewPager    lt view     android layout width  match parent      android layout height  wrap content      class  de cybergen ui layout WrapContentHeightViewPager      android id    id wrapContentHeightViewPager      android layout alignParentBottom  true      android layout alignParentLeft  true   gt    Advantage  This approach allows using the ViewPager in any layout including RelativeLayout to overlay other ui elements   One drawback remains  If you want to use margins  you have to create two nested layouts and give the inner one the desired margins   Here s the code   public class WrapContentHeightViewPager extends ViewPager                   Constructor                param context the context             public WrapContentHeightViewPager Context context            super context                         Constructor                param context the context         param attrs the attribute set             public WrapContentHeightViewPager Context context  AttributeSet attrs            super context  attrs               Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            super onMeasure widthMeasureSpec  heightMeasureSpec               find the first child view         View view   getChildAt 0           if  view    null                   measure the first child view with the specified measure spec             view measure widthMeasureSpec  heightMeasureSpec                      setMeasuredDimension getMeasuredWidth    measureHeight heightMeasureSpec  view                          Determines the height of this view                param measureSpec A measureSpec packed into an int         param view the base view with already measured height                return The height of the view  honoring constraints from measureSpec             private int measureHeight int measureSpec  View view            int result   0          int specMode   MeasureSpec getMode measureSpec           int specSize   MeasureSpec getSize measureSpec            if  specMode    MeasureSpec EXACTLY                result   specSize            else                  set the height from the base view if available             if  view    null                    result   view getMeasuredHeight                              if  specMode    MeasureSpec AT MOST                    result   Math min result  specSize                                   return result

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I bumped into the same issue  and I also had to make the ViewPager wrap around its contents when the user scrolled between the pages  Using cybergen s above answer  I defined the onMeasure method as following    Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        super onMeasure widthMeasureSpec  heightMeasureSpec        if  getCurrentItem    lt  getChildCount              View child   getChildAt getCurrentItem             if  child getVisibility      GONE                heightMeasureSpec   MeasureSpec makeMeasureSpec MeasureSpec getSize heightMeasureSpec                       MeasureSpec UNSPECIFIED               child measure widthMeasureSpec  heightMeasureSpec                      setMeasuredDimension getMeasuredWidth    measureHeight heightMeasureSpec  getChildAt getCurrentItem                             This way  the onMeasure method sets the height of the current page displayed by the ViewPager

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This ViewPager only resizes to the current visible children  not the biggest of its actual children   The idea from https   stackoverflow com a 56325869 4718406  public class DynamicHeightViewPager extends ViewPager    public DynamicHeightViewPager  Context context        super context       initPageChangeListener       public DynamicHeightViewPager  Context context  AttributeSet attrs        super context  attrs       initPageChangeListener         private void initPageChangeListener         addOnPageChangeListener new ViewPager SimpleOnPageChangeListener              Override         public void onPageSelected int position                requestLayout                          Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec          View child   getChildAt getCurrentItem         View child   getCurrentView this       if  child    null            child measure widthMeasureSpec  MeasureSpec makeMeasureSpec 0            MeasureSpec UNSPECIFIED            int h   child getMeasuredHeight             heightMeasureSpec   MeasureSpec makeMeasureSpec h  MeasureSpec EXACTLY             super onMeasure widthMeasureSpec  heightMeasureSpec       View getCurrentView ViewPager viewPager        try           final int currentItem   viewPager getCurrentItem            for  int i   0  i  lt  viewPager getChildCount    i                  final View child   viewPager getChildAt i               final ViewPager LayoutParams layoutParams    ViewPager LayoutParams                child getLayoutParams                 Field f   layoutParams getClass   getDeclaredField  position                   NoSuchFieldException             f setAccessible true               int position    Integer  f get layoutParams     IllegalAccessException              if   layoutParams isDecor  amp  amp  currentItem    position                    return child                                catch  NoSuchFieldException e            e fillInStackTrace          catch  IllegalArgumentException e            e fillInStackTrace          catch  IllegalAccessException e            e fillInStackTrace              return null

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For people having this problem and coding for Xamarin Android in C   this might also be a quick solution   pager ChildViewAdded     sender  e    gt        e Child Measure   int MeasureSpecMode Unspecified   int MeasureSpecMode Unspecified       e Parent LayoutParameters Height   e Child MeasuredHeight       This is mainly useful if your child views are of the same height  Otherwise  you would be required to store some kind of  minimumHeight  value over all children that you check against  and even then you might not want to have empty spaces visible beneath your smaller child views    The solution itself is not sufficient for me though  but that is because my child items are listViews and their MeasuredHeight is not calculated correctly  it seems

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Give parent layout of ViewPager as NestedScrollView      lt androidx core widget NestedScrollView     android layout width  match parent      android layout height  match parent      android paddingLeft  5dp      android paddingRight  5dp      android fillViewport  true  gt           lt androidx viewpager widget ViewPager             android id    id viewPager              android layout width  match parent              android layout height  wrap content  gt           lt  androidx viewpager widget ViewPager gt       lt  androidx core widget NestedScrollView gt    Don t forget to set android fillViewport  true   This will stretch scrollview and its child s content to fill the viewport   https   developer android com reference android widget ScrollView html attr android fillViewport

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I based my answer on Daniel L  pez Lacalle and this post http   www henning ms 2013 09 09 viewpager-that-simply-dont-measure-up   The problem with Daniel s answer is that in some cases my children had a height of zero  The solution was to unfortunately measure twice    Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        int mode   MeasureSpec getMode heightMeasureSpec          Unspecified means that the ViewPager is in a ScrollView WRAP CONTENT         At Most means that the ViewPager is not in a ScrollView WRAP CONTENT      if  mode    MeasureSpec UNSPECIFIED    mode    MeasureSpec AT MOST               super has to be called in the beginning so the child views can be initialized          super onMeasure widthMeasureSpec  heightMeasureSpec           int height   0          for  int i   0  i  lt  getChildCount    i                  View child   getChildAt i               child measure widthMeasureSpec  MeasureSpec makeMeasureSpec 0  MeasureSpec UNSPECIFIED                int h   child getMeasuredHeight                if  h  gt  height  height   h                    heightMeasureSpec   MeasureSpec makeMeasureSpec height  MeasureSpec EXACTLY                super has to be called again so the new specs are treated as exact measurements     super onMeasure widthMeasureSpec  heightMeasureSpec       This also lets you set a height on the ViewPager if you so want to or just wrap content

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Nothing of suggested above worked for me  My use case is having 4 custom ViewPagers in ScrollView  Top of them is measured based on aspect ratio and the rest just has layout height wrap content  I ve tried cybergen   Daniel L  pez Lacalle solutions  None of them work fully for me    My guess why cybergen doesn t work on page   1 is because it calculates height of pager based on page 1  that is hidden if you scroll further   Both cybergen and Daniel L  pez Lacalle suggestions have weird behavior in my case  2 of 3 are loaded ok and 1 randomly height is 0  Appears that onMeasure was called before children were populated  So I came up with a mixture of these 2 answers   my own fixes    Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        super onMeasure widthMeasureSpec  heightMeasureSpec       if  getLayoutParams   height    ViewGroup LayoutParams WRAP CONTENT               find the first child view         View view   getChildAt 0           if  view    null                   measure the first child view with the specified measure spec             view measure widthMeasureSpec  heightMeasureSpec               int h   view getMeasuredHeight                setMeasuredDimension getMeasuredWidth    h                 do not recalculate height anymore             getLayoutParams   height   h                      Idea is to let ViewPager calculate children s dimensions and save calculated height of first page in layout params of the ViewPager  Don t forget to set fragment s layout height to wrap content otherwise you can get height 0  I ve used this one    lt  xml version  1 0  encoding  utf-8   gt    lt LinearLayout xmlns android  http   schemas android com apk res android      android orientation  horizontal  android layout width  match parent      android layout height  wrap content  gt           lt  -- Childs are populated in fragment -- gt   lt  LinearLayout gt    Please note that this solution works great if all of your pages have same height  Otherwise you need to recalculate ViewPager height based on current child active  I don t need it  but if you suggest the solution I would be happy to update the answer

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Most of the solutions I see here seem to be doing a double measurement  first measuring the  child views  and then calling the super onMeasure    I have come up with a custom WrapContentViewPager that is more efficient  works well with RecyclerView and Fragment  You can check the demo here   github ssynhtn WrapContentViewPager  and the code of the class here  WrapContentViewPager java

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I ve found a solution that is a bit like merging of some of the solutions mentioned here   The idea is to measure the current view of the ViewPager   Here s the full code   MainActivity kt  class MainActivity   AppCompatActivity          override fun onCreate savedInstanceState  Bundle             super onCreate savedInstanceState          setContentView R layout activity main          viewPager adapter   WrapHeightViewPager CustomPagerAdapter this            activity main xml   lt FrameLayout         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   MainActivity  gt        lt com android myapplication WrapHeightViewPager             android layout width  match parent  android id    id viewPager              android background   33ff0000              android layout height  wrap content   gt    lt  FrameLayout gt    view pager page xml   lt LinearLayout xmlns android  http   schemas android com apk res android                android orientation  vertical  android gravity  center                android layout width  match parent                android layout height  wrap content  gt        lt ImageView android layout width  wrap content  android layout height  wrap content                 android src   android drawable sym def app icon   gt         lt TextView android layout width  wrap content  android layout height  wrap content  android id    id textView   gt   lt  LinearLayout gt    WrapHeightViewPager kt  class WrapHeightViewPager   ViewPager       constructor context  Context    super context          constructor context  Context  attrs  AttributeSet     super context  attrs          override fun onMeasure widthMeasureSpec  Int  heightMeasureSpec  Int            super onMeasure widthMeasureSpec  heightMeasureSpec          val adapter   adapter as CustomPagerAdapter          val currentView   adapter  currentView         if  currentView    null                currentView measure widthMeasureSpec  heightMeasureSpec              super onMeasure                  widthMeasureSpec                  View MeasureSpec makeMeasureSpec currentView measuredHeight  View MeasureSpec EXACTLY                            return                   super onMeasure widthMeasureSpec  heightMeasureSpec             class CustomPagerAdapter private val context  Context    PagerAdapter             var currentView  View    null          override fun instantiateItem parent  ViewGroup  position  Int   Any               val inflater   LayoutInflater from context              val view   inflater inflate R layout view pager page  parent  false              view textView text    item position              parent addView view              return view                    override fun setPrimaryItem container  ViewGroup  position  Int  obj  Any                super setPrimaryItem container  position  obj              currentView   obj as View                    override fun destroyItem collection  ViewGroup  position  Int  view  Any    collection removeView view as View           override fun getCount    Int   3          override fun isViewFromObject view  View  obj  Any    view     obj          override fun getPageTitle position  Int   CharSequence     item  position             If you use RecyclerPagerAdapter library  the way to get the  currentView  is by getting it from the pager-view-holder that you ve set       val item   obj as PagerViewHolder     currentView   item itemView

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in my case adding clipToPadding solved the problem    lt android support v4 view ViewPager             android clipToPadding  false                gt    Cheers

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For those who want a solution of ViewPager2 that will have the ViewPager2 have the same height as the max height of all of its pages  sadly I ve found only this workaround  viewPager doOnPreDraw         workaround to set the viewPagerheight the same as its children     var height   0     for  i in 0 until featuresViewPager adapter   itemCount            val viewHolder   viewPager adapter   createViewHolder viewPager  0          viewPager adapter   bindViewHolder viewHolder  i          val child  View   viewHolder itemView         child layoutParams height   ViewGroup LayoutParams WRAP CONTENT         val widthMeasureSpec   View MeasureSpec makeMeasureSpec viewPager width  View MeasureSpec EXACTLY          val heightMeasureSpec   View MeasureSpec makeMeasureSpec 0  View MeasureSpec UNSPECIFIED          child measure widthMeasureSpec  heightMeasureSpec          val childHeight   child measuredHeight         child layoutParams height   ViewGroup LayoutParams MATCH PARENT         if  childHeight  gt  height              height   childHeight           viewPager layoutParams height   height    I say  quot sadly quot  because it goes over all of the pages  creates their views  measures them  and on the way it calls functions that are meant for other purposes  Should work fine in most cases  Please let me know if you know of a nicer solution

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The below code is the only thing worked for me  1  Use this class to declare a HeightWrappingViewPager    public class HeightWrappingViewPager extends ViewPager            public HeightWrappingViewPager Context context                super context                      public HeightWrappingViewPager Context context  AttributeSet attrs                super context  attrs                       Override         protected void onMeasure int widthMeasureSpec  int heightMeasureSpec                int mode   MeasureSpec getMode heightMeasureSpec                  Unspecified means that the ViewPager is in a ScrollView WRAP CONTENT                 At Most means that the ViewPager is not in a ScrollView WRAP CONTENT              if  mode    MeasureSpec UNSPECIFIED    mode    MeasureSpec AT MOST                       super has to be called in the beginning so the child views can be initialized                  super onMeasure widthMeasureSpec  heightMeasureSpec                   int height   0                  for  int i   0  i  lt  getChildCount    i                          View child   getChildAt i                       child measure widthMeasureSpec  MeasureSpec makeMeasureSpec 0  MeasureSpec UNSPECIFIED                        int h   child getMeasuredHeight                        if  h  gt  height  height   h                                    heightMeasureSpec   MeasureSpec makeMeasureSpec height  MeasureSpec EXACTLY                                super has to be called again so the new specs are treated as exact measurements             super onMeasure widthMeasureSpec  heightMeasureSpec                     2  Insert the height wrapping view pager to your xml file    lt com project test HeightWrappingViewPager     android id    id pager      android layout width  match parent      android layout height  match parent  gt   lt  com project test HeightWrappingViewPager gt    3  Declare your view pager   HeightWrappingViewPager mViewPager  mViewPager    HeightWrappingViewPager  itemView findViewById R id pager   CustomAdapter adapter   new CustomAdapter context   mViewPager setAdapter adapter   mViewPager measure LinearLayout LayoutParams MATCH PARENT  LinearLayout LayoutParams WRAP CONTENT

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I just bumped into the same issue  I had a ViewPager and I wanted to display an ad at the button of it  The solution I found was to get the pager into a RelativeView and set it s layout above to the view id i want to see below it  that worked for me   here is my layout XML      lt RelativeLayout     xmlns android  http   schemas android com apk res android      android layout width  match parent      android layout height  match parent   gt        lt LinearLayout         android id    id AdLayout          android layout width  match parent          android layout height  wrap content          android layout alignParentBottom  true          android orientation  vertical   gt       lt  LinearLayout gt        lt android support v4 view ViewPager         android id    id mainpager          android layout width  match parent          android layout height  match parent          android layout above    id AdLayout   gt       lt  android support v4 view ViewPager gt   lt  RelativeLayout gt

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I have faced this issue in several project already and never had a complete solution  So I created a WrapContentViewPager github project as a in-place replacement for ViewPager   https   github com rnevet WCViewPager  The solution was inspired by some of the answers here  but improves on    Dynamically changes the ViewPager height according to current View including while scrolling  Takes into consideration the height of  decor  views like PagerTabStrip  Takes into consideration all Padding    Updated for support library version 24 which broke previous implementation

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I edit cybergen answer for make viewpager to change height depending on selected item The class is the same of cybergen s  but I added a Vector of integers that is all viewpager s child views heights and we can access it when page change to update height  This is the class   import android content Context  import android util AttributeSet  import android view View   import androidx annotation NonNull  import androidx annotation Nullable  import androidx viewpager widget ViewPager   import java util Vector   public class WrapContentHeightViewPager extends ViewPager       private Vector lt Integer gt  heights   new Vector lt  gt          public WrapContentHeightViewPager  NonNull Context context            super context              public WrapContentHeightViewPager  NonNull Context context   Nullable AttributeSet attrs            super context  attrs               Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            super onMeasure widthMeasureSpec  heightMeasureSpec            for int i 0 i lt getChildCount   i                  View view   getChildAt i               if  view    null                    view measure widthMeasureSpec  heightMeasureSpec                   heights add measureHeight heightMeasureSpec  view                                    setMeasuredDimension getMeasuredWidth    measureHeight heightMeasureSpec  getChildAt 0                public int getHeightAt int position           return heights get position              private int measureHeight int measureSpec  View view            int result   0          int specMode   MeasureSpec getMode measureSpec           int specSize   MeasureSpec getSize measureSpec            if  specMode    MeasureSpec EXACTLY                result   specSize            else               if  view    null                    result   view getMeasuredHeight                              if  specMode    MeasureSpec AT MOST                    result   Math min result  specSize                                   return result            Then in your activity add an OnPageChangeListener  WrapContentHeightViewPager viewPager   findViewById R id my viewpager   viewPager addOnPageChangeListener new ViewPager OnPageChangeListener           Override      public void onPageScrolled int position  float positionOffset  int positionOffsetPixels           Override      public void onPageSelected int position             LinearLayout LayoutParams params    LinearLayout LayoutParams  viewPager getLayoutParams             params height   viewPager getHeightAt position            viewPager setLayoutParams params                Override      public void onPageScrollStateChanged int state           And here is xml    lt com example example WrapContentHeightViewPager     android id    id my viewpager      android fillViewport  true      android layout width  match parent      android layout height  wrap content   gt    Please correct my English if necessary

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I my case adding android fillViewport  true  solved the issue

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You can switch to ViewPager2  It is an updated version of ViewPager  It does the same thing as ViewPager but in a smarter and efficient way  ViewPager2 comes with a variety of new features  Of course the Wrap Content issue has been solved by ViewPager2   From Android docs   ViewPager2 replaces ViewPager  addressing most of its predecessor   s pain-points  including right-to-left layout support  vertical orientation  modifiable Fragment collections  etc    I recommend this article for beginners   https   medium com google-developer-experts exploring-the-view-pager-2-86dbce06ff71

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In my case  I needed a viewpager with a wrap content for the currently selected element and animation when applying the size  Below you can see my implementation  Can someone come in handy   package one xcorp widget  import android animation ValueAnimator import android content Context import android util AttributeSet import android view View import android view ViewGroup LayoutParams MATCH PARENT import android view ViewGroup LayoutParams WRAP CONTENT import one xcorp widget R import kotlin properties Delegates observable  class ViewPager   android support v4 view ViewPager        var enableAnimation by observable false          enable - gt          if  enable                addOnPageChangeListener onPageChangeListener            else               removeOnPageChangeListener onPageChangeListener                       private var animationDuration   0L     private var animator  ValueAnimator    null      constructor  context  Context    super context            init context  null             constructor  context  Context  attrs  AttributeSet     super context  attrs            init context  attrs             private fun init context  Context  attrs  AttributeSet             context theme obtainStyledAttributes              attrs              R styleable ViewPager              0              0           apply               try                   enableAnimation   getBoolean                      R styleable ViewPager enableAnimation                      enableAnimation                                   animationDuration   getInteger                      R styleable ViewPager animationDuration                      resources getInteger android R integer config shortAnimTime                    toLong                 finally                   recycle                                      override fun onMeasure widthMeasureSpec  Int  heightMeasureSpec  Int            val heightMode   MeasureSpec getMode heightMeasureSpec           val measuredHeight   if  heightMode    MeasureSpec EXACTLY                MeasureSpec getSize heightMeasureSpec            else               val currentViewHeight   findViewByPosition currentItem   also                   measureView it                 measuredHeight    0              if  heightMode    MeasureSpec AT MOST                    currentViewHeight               else                   Math min                      currentViewHeight                      MeasureSpec getSize heightMeasureSpec                                                     super onMeasure              widthMeasureSpec              MeasureSpec makeMeasureSpec measuredHeight  MeasureSpec EXACTLY                       private fun measureView view  View    with view            val horizontalMode  Int         val horizontalSize  Int         when  layoutParams width                MATCH PARENT - gt                    horizontalMode   MeasureSpec EXACTLY                 horizontalSize   this ViewPager measuredWidth                           WRAP CONTENT - gt                    horizontalMode   MeasureSpec UNSPECIFIED                 horizontalSize   0                           else - gt                    horizontalMode   MeasureSpec EXACTLY                 horizontalSize   layoutParams width                                  val verticalMode  Int         val verticalSize  Int         when  layoutParams height                MATCH PARENT - gt                    verticalMode   MeasureSpec EXACTLY                 verticalSize   this ViewPager measuredHeight                           WRAP CONTENT - gt                    verticalMode   MeasureSpec UNSPECIFIED                 verticalSize   0                           else - gt                    verticalMode   MeasureSpec EXACTLY                 verticalSize   layoutParams height                                  val horizontalMeasureSpec   MeasureSpec makeMeasureSpec horizontalSize  horizontalMode          val verticalMeasureSpec   MeasureSpec makeMeasureSpec verticalSize  verticalMode           measure horizontalMeasureSpec  verticalMeasureSpec             private fun findViewByPosition position  Int   View            for  i in 0 until childCount                val childView   getChildAt i              val childLayoutParams   childView layoutParams as LayoutParams              val childPosition by lazy                   val field   childLayoutParams javaClass getDeclaredField  position                   field isAccessible   true                 field get childLayoutParams  as Int                            if   childLayoutParams isDecor  amp  amp  position    childPosition                    return childView                                  return null            private fun animateContentHeight childView  View  fromHeight  Int  toHeight  Int            animator  cancel            if  fromHeight    toHeight                return                    animator   ValueAnimator ofInt fromHeight  toHeight  apply               addUpdateListener                   measureView childView                  if  childView measuredHeight    toHeight                        animateContentHeight childView  height  childView measuredHeight                    else                       layoutParams height   animatedValue as Int                     requestLayout                                               duration   animationDuration             start                        private val onPageChangeListener   object   OnPageChangeListener            override fun onPageScrollStateChanged state  Int                   do nothing                       override fun onPageScrolled              position  Int              positionOffset  Float              positionOffsetPixels  Int                            do nothing                       override fun onPageSelected position  Int                if   isAttachedToWindow                    return                            findViewByPosition position   let   childView - gt                  measureView childView                  animateContentHeight childView  height  childView measuredHeight                                    Add attrs xml in project    lt  xml version  1 0  encoding  utf-8   gt   lt resources gt       lt declare-styleable name  ViewPager  gt           lt attr name  enableAnimation  format  boolean    gt           lt attr name  animationDuration  format  integer    gt       lt  declare-styleable gt   lt  resources gt    And use    lt one xcorp widget ViewPager     android id    id wt content      android layout width  match parent      android layout height  wrap content      app enableAnimation  true    gt

User · Answer

I have a similar  but more complex scenario   I have a dialog  which contains a ViewPager  One of the child pages is short  with a static height  Another child page should always be as tall as possible  Another child page contains a ScrollView  and the page  and thus the entire dialog  should WRAP CONTENT if the ScrollView contents don t need the full height available to the dialog   None of the existing answers worked completely for this specific scenario  Hold on- it s a bumpy ride   void setupView         final ViewPager SimpleOnPageChangeListener pageChangeListener   new ViewPager SimpleOnPageChangeListener              Override         public void onPageSelected int position                currentPagePosition   position                  Update the viewPager height for the current view                             Borrowed from https   github com rnevet WCViewPager blob master wcviewpager src main java nevet me wcviewpager WrapContentViewPager java             Gather the height of the  decor  views  since this height isn t included             when measuring each page s view height                              int decorHeight   0              for  int i   0  i  lt  viewPager getChildCount    i                      View child   viewPager getChildAt i                   ViewPager LayoutParams lp    ViewPager LayoutParams  child getLayoutParams                    if  lp    null  amp  amp  lp isDecor                        int vgrav   lp gravity  amp  Gravity VERTICAL GRAVITY MASK                      boolean consumeVertical   vgrav    Gravity TOP    vgrav    Gravity BOTTOM                      if  consumeVertical                            decorHeight    child getMeasuredHeight                                                                       int newHeight   decorHeight               switch  position                    case PAGE WITH SHORT AND STATIC CONTENT                      newHeight    measureViewHeight thePageView1                       break                  case PAGE TO FILL PARENT                      newHeight   ViewGroup LayoutParams MATCH PARENT                      break                  case PAGE TO WRAP CONTENT                      newHeight   ViewGroup LayoutParams WRAP CONTENT     Works same as MATCH PARENT because   reasons                        newHeight    measureViewHeight thePageView2      Doesn t allow scrolling when sideways and height is clipped                                             Only option that allows the ScrollView content to scroll fully                      Just doing this might be way too tall  especially on tablets                       Will shrink it down below                                              newHeight   ViewGroup LayoutParams MATCH PARENT                      break                                Update the height             ViewGroup LayoutParams layoutParams   viewPager getLayoutParams                layoutParams height   newHeight              viewPager setLayoutParams layoutParams                if  position    PAGE TO WRAP CONTENT                       This page should wrap content                     Measure height of the scrollview child                 View scrollViewChild            generally this is a LinearLayout                  int scrollViewChildHeight   scrollViewChild getHeight       full height  even portion which can t be shown                       doesn t need measureViewHeight   because    reasons                     if  viewPager getHeight    gt  scrollViewChildHeight       View pager too tall                         Wrap view pager height down to child height                     newHeight   scrollViewChildHeight   decorHeight                       ViewGroup LayoutParams layoutParams2   viewPager getLayoutParams                        layoutParams2 height   newHeight                      viewPager setLayoutParams layoutParams2                                                   Bonus goodies                   Show or hide the keyboard as appropriate   Some pages have EditTexts  some don t              switch  position                       This case takes a little bit more aggressive code than usual                  if  position needs keyboard shown                       showKeyboardForEditText                      else if                       hideKeyboard                                                          viewPager addOnPageChangeListener pageChangeListener        viewPager getViewTreeObserver   addOnGlobalLayoutListener              new ViewTreeObserver OnGlobalLayoutListener                      Override                 public void onGlobalLayout                            http   stackoverflow com a 4406090 4176104                        Do things which require the views to have their height populated here                     pageChangeListener onPageSelected currentPagePosition      fix the height of the first page                      if  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN                            viewPager getViewTreeObserver   removeOnGlobalLayoutListener this                         else                           viewPager getViewTreeObserver   removeGlobalOnLayoutListener this                                                                          private void showKeyboardForEditText            Make the keyboard appear      getDialog   getWindow   clearFlags WindowManager LayoutParams FLAG NOT FOCUSABLE   WindowManager LayoutParams FLAG ALT FOCUSABLE IM       getDialog   getWindow   setSoftInputMode WindowManager LayoutParams SOFT INPUT STATE ALWAYS VISIBLE   WindowManager LayoutParams SOFT INPUT ADJUST PAN        inputViewToFocus requestFocus            http   stackoverflow com a 5617130 4176104     InputMethodManager inputMethodManager                InputMethodManager  getActivity   getSystemService Context INPUT METHOD SERVICE       inputMethodManager toggleSoftInputFromWindow              inputViewToFocus getApplicationWindowToken                InputMethodManager SHOW IMPLICIT  0                  Hide the keyboard - http   stackoverflow com a 8785471     private void hideKeyboard         InputMethodManager inputManager    InputMethodManager  getActivity   getSystemService Context INPUT METHOD SERVICE        inputManager hideSoftInputFromWindow inputBibleBookStart getWindowToken    InputMethodManager HIDE NOT ALWAYS             https   github com rnevet WCViewPager blob master wcviewpager src main java nevet me wcviewpager WrapContentViewPager java private int measureViewHeight View view        view measure ViewGroup getChildMeasureSpec -1  -1  view getLayoutParams   width   View MeasureSpec makeMeasureSpec 0  View MeasureSpec UNSPECIFIED        return view getMeasuredHeight        Much thanks to  Raanan for the code to measure views and measure the decor height  I ran into problems with his library- the animation stuttered  and I think my ScrollView wouldn t scroll when the height of the dialog was short enough to require it

User · Answer

Overriding onMeasure of your ViewPager as follows will make it get the height of the biggest child it currently has   Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        super onMeasure widthMeasureSpec  heightMeasureSpec        int height   0      int childWidthSpec   MeasureSpec makeMeasureSpec          Math max 0  MeasureSpec getSize widthMeasureSpec  -             getPaddingLeft   - getPaddingRight             MeasureSpec getMode widthMeasureSpec            for  int i   0  i  lt  getChildCount    i              View child   getChildAt i           child measure childWidthSpec  MeasureSpec UNSPECIFIED           int h   child getMeasuredHeight            if  h  gt  height  height   h                 if  height    0            heightMeasureSpec   MeasureSpec makeMeasureSpec height  MeasureSpec EXACTLY              super onMeasure widthMeasureSpec  heightMeasureSpec

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From Popcorn time android app s source code I found this solution which dynamically adjusts size of viewpager with nice animation depending on the size of current child   https   git popcorntime io popcorntime android blob 5934f8d0c8fed39af213af4512272d12d2efb6a6 mobile src main java pct droid widget WrappingViewPager java  public class WrappingViewPager extends ViewPager        private Boolean mAnimStarted   false       public WrappingViewPager Context context            super context              public WrappingViewPager Context context  AttributeSet attrs           super context  attrs               TargetApi Build VERSION CODES JELLY BEAN       Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            super onMeasure widthMeasureSpec  heightMeasureSpec            if  mAnimStarted  amp  amp  null    getAdapter                  int height   0              View child     FragmentPagerAdapter  getAdapter    getItem getCurrentItem    getView                if  child    null                    child measure widthMeasureSpec  MeasureSpec makeMeasureSpec 0  MeasureSpec UNSPECIFIED                    height   child getMeasuredHeight                    if  VersionUtils isJellyBean    amp  amp  height  lt  getMinimumHeight                          height   getMinimumHeight                                                    Not the best place to put this animation  but it works pretty good              int newHeight   MeasureSpec makeMeasureSpec height  MeasureSpec EXACTLY               if  getLayoutParams   height    0  amp  amp  heightMeasureSpec    newHeight                        final int targetHeight   height                      final int currentHeight   getLayoutParams   height                      final int heightChange   targetHeight - currentHeight                       Animation a   new Animation                              Override                         protected void applyTransformation float interpolatedTime  Transformation t                                if  interpolatedTime  gt   1                                    getLayoutParams   height   targetHeight                                else                                   int stepHeight    int   heightChange   interpolatedTime                                   getLayoutParams   height   currentHeight   stepHeight                                                            requestLayout                                                        Override                         public boolean willChangeBounds                                 return true                                                                        a setAnimationListener new Animation AnimationListener                              Override                         public void onAnimationStart Animation animation                                mAnimStarted   true                                                      Override                         public void onAnimationEnd Animation animation                                mAnimStarted   false                                                      Override                         public void onAnimationRepeat Animation animation                                                                           a setDuration 1000                       startAnimation a                       mAnimStarted   true                else                   heightMeasureSpec   newHeight                                   super onMeasure widthMeasureSpec  heightMeasureSpec

User · Answer

Using Daniel L  pez Localle answer  I created this class in Kotlin  Hope it save you more time  class DynamicHeightViewPager  JvmOverloads constructor context  Context  attrs  AttributeSet    null    ViewPager context  attrs     override fun onMeasure widthMeasureSpec  Int  heightMeasureSpec  Int        var heightMeasureSpec   heightMeasureSpec      var height   0     for  i in 0 until childCount            val child   getChildAt i          child measure widthMeasureSpec  View MeasureSpec makeMeasureSpec 0  View MeasureSpec UNSPECIFIED           val h   child measuredHeight         if  h  gt  height  height   h            if  height    0            heightMeasureSpec   View MeasureSpec makeMeasureSpec height  View MeasureSpec EXACTLY             super onMeasure widthMeasureSpec  heightMeasureSpec

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All answers do not work perfectly  So I created one  Below class would request layout when a new page was selected to make viewPager  s height is the current child view s height   class WrapContentViewPager   ViewPager       constructor context  Context    super context      constructor context  Context  attrs  AttributeSet     super context  attrs       private var curPos   0      init           addOnPageChangeListener object   ViewPager OnPageChangeListener               override fun onPageScrollStateChanged state  Int                  override fun onPageScrolled                  position  Int                  positionOffset  Float                  positionOffsetPixels  Int                               override fun onPageSelected position  Int                    curPos   position                 requestLayout                                       override fun onMeasure widthMeasureSpec  Int  heightMeasureSpec  Int            if  childCount    0                super onMeasure widthMeasureSpec  heightMeasureSpec              return                   measureChildren widthMeasureSpec  heightMeasureSpec          setMeasuredDimension measuredWidth  getChildAt curPos  measuredHeight

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Improved Daniel L  pez Lacalle answer  rewritten in Kotlin   class MyViewPager context  Context  attrs  AttributeSet   ViewPager context  attrs        override fun onMeasure widthMeasureSpec  Int  heightMeasureSpec  Int            val zeroHeight   MeasureSpec makeMeasureSpec 0  MeasureSpec UNSPECIFIED           val maxHeight   children              map   it measure widthMeasureSpec  zeroHeight   it measuredHeight                max      0          if  maxHeight  gt  0                val maxHeightSpec   MeasureSpec makeMeasureSpec maxHeight  MeasureSpec EXACTLY              super onMeasure widthMeasureSpec  maxHeightSpec              return                    super onMeasure widthMeasureSpec  heightMeasureSpec

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public CustomPager  Context context        super context      public CustomPager  Context context  AttributeSet attrs        super context  attrs      int getMeasureExactly View child  int widthMeasureSpec        child measure widthMeasureSpec  MeasureSpec makeMeasureSpec 0  MeasureSpec UNSPECIFIED        int height   child getMeasuredHeight        return MeasureSpec makeMeasureSpec height  MeasureSpec EXACTLY       Override public void onMeasure int widthMeasureSpec  int heightMeasureSpec        super onMeasure widthMeasureSpec  heightMeasureSpec       boolean wrapHeight   MeasureSpec getMode heightMeasureSpec     MeasureSpec AT MOST       final View tab   getChildAt 0       if  tab    null            return             int width   getMeasuredWidth        if  wrapHeight               Keep the current measured width          widthMeasureSpec   MeasureSpec makeMeasureSpec width  MeasureSpec EXACTLY             Fragment fragment     Fragment  getAdapter   instantiateItem this  getCurrentItem          heightMeasureSpec   getMeasureExactly fragment getView    widthMeasureSpec          Log i Constants TAG   item      getCurrentItem       height    heightMeasureSpec          super has to be called again so the new specs are treated as        exact measurements      super onMeasure widthMeasureSpec  heightMeasureSpec

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I was just answering a very similar question about this  and happened to find this when looking for a link to back up my claims  so lucky you       My other answer  The ViewPager does not support wrap content as it  usually  never have all its children loaded at the same time  and can therefore not get an appropriate size  the option would be to have a pager that changes size every time you have switched page    You can however set a precise dimension  e g  150dp  and match parent works as well  You can also modify the dimensions dynamically from your code by changing the height-attribute in its LayoutParams   For your needs you can create the ViewPager in its own xml-file  with the layout height set to 200dp  and then in your code  rather than creating a new ViewPager from scratch  you can inflate that xml-file   LayoutInflater inflater   context getLayoutInflater    inflater inflate R layout viewpagerxml  layout  true

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Another solution is to update ViewPager height according to the current page height in its PagerAdapter  Assuming that your are creating your ViewPager pages this way    Override public Object instantiateItem ViewGroup container  int position      PageInfo item   mPages get position     item mImageView   new CustomImageView container getContext       item mImageView setImageDrawable item mDrawable     container addView item mImageView  0     return item      Where mPages is internal list of PageInfo structures dynamically added to the PagerAdapter and CustomImageView is just regular ImageView with overriden onMeasure   method that sets its height according to specified width and keeps image aspect ratio   You can force ViewPager height in setPrimaryItem   method    Override public void setPrimaryItem ViewGroup container  int position  Object object      super setPrimaryItem container  position  object      PageInfo item    PageInfo  object    ViewPager pager    ViewPager  container    int width   item mImageView getMeasuredWidth      int height   item mImageView getMeasuredHeight      pager setLayoutParams new FrameLayout LayoutParams width  Math max height  1         Note the Math max height  1   That fixes annoying bug that ViewPager does not update displayed page  shows it blank   when previous page has zero height  i  e  null drawable in the CustomImageView   each odd swipe back and forth between two pages

[android] Android: I am unable to have ViewPager WRAP_CONTENT

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