Determining the size of an Android view at runtime

Question

I am trying to apply an animation to a view in my Android app after my activity is created   To do this  I need to determine the current size of the view  and then set up an animation to scale from the current size to the new size   This part must be done at runtime  since the view scales to different sizes depending on input from the user   My layout is defined in XML   This seems like an easy task  and there are lots of SO questions regarding this though none which solved my problem  obviously   So perhaps I am missing something obvious   I get a handle to my view by   ImageView myView    ImageView  getWindow   findViewById R id MyViewID     This works fine  but when calling getWidth    getHeight    getMeasuredWidth    getLayoutParams   width  etc   they all return 0   I have also tried manually calling measure   on the view followed by a call to getMeasuredWidth    but that has no effect   I have tried calling these methods and inspecting the object in the debugger in my activity s onCreate   and in onPostCreate     How can I figure out the exact dimensions of this view at runtime

User · Answer

Use below code  it is give the size of view    Override public void onWindowFocusChanged boolean hasFocus           super onWindowFocusChanged hasFocus          Log e  WIDTH     view getWidth            Log e  HEIGHT     view getHeight

User · Answer

I was also lost around getMeasuredWidth   and getMeasuredHeight   getHeight   and getWidth   for a long time           later i found that getting the view s width and height in onSizeChanged   is the best way to do this         you can dynamically get your CURRENT width and CURRENT height of your view by overriding the onSizeChanged   method   might wanna take a look at this which has an elaborate code snippet  New Blog Post  how to get width and height dimensions of a customView  extends View  in Android http   syedrakibalhasan blogspot com 2011 02 how-to-get-width-and-height-dimensions html

User · Answer

works perfekt for me    protected override void OnElementPropertyChanged object sender  PropertyChangedEventArgs e                base OnElementPropertyChanged sender  e           CTEditor ctEdit   Element as CTEditor          if  ctEdit    null  return                     if  e PropertyName     Text                         double xHeight   Element Height              double aHaight   Control Height              double height                              Control Measure LayoutParams MatchParent LayoutParams WrapContent               height   Control MeasuredHeight              height   xHeight   aHaight   height              if  Element HeightRequest    height                  Element HeightRequest   height

User · Answer

Are you calling getWidth   before the view is actually laid out on the screen      A common mistake made by new Android developers is to use  the width   and height of a view inside its constructor  When  a view   s   constructor is called  Android doesn   t know yet how  big the view will   be  so the sizes are set to zero  The real sizes are calculated during   the layout stage  which occurs after construction but before anything   is drawn  You can use the onSizeChanged   method to be notified of   the values when they are known  or you can use the getWidth   and   getHeight   methods later  such as in the onDraw   method

User · Answer

You can get both Position and Dimension of the view on screen  val viewTreeObserver  ViewTreeObserver   videoView viewTreeObserver   if  viewTreeObserver isAlive        viewTreeObserver addOnGlobalLayoutListener object   ViewTreeObserver OnGlobalLayoutListener           override fun onGlobalLayout                   Remove Listener             videoView viewTreeObserver removeOnGlobalLayoutListener this                  View Dimentions             viewWidth   videoView width              viewHeight   videoView height                 View Location             val point   IntArray 2              videoView post                   videoView getLocationOnScreen point     or getLocationInWindow point                  viewPositionX   point 0                  viewPositionY   point 1

User · Answer

Here is the code for getting the layout via overriding a view if API  lt  11  API 11 includes the View OnLayoutChangedListener feature    public class CustomListView extends ListView       private OnLayoutChangedListener layoutChangedListener       public CustomListView Context context                super context               Override     protected void onLayout boolean changed  int l  int t  int r  int b                if  layoutChangedListener    null                        layoutChangedListener onLayout changed  l  t  r  b                     super onLayout changed  l  t  r  b              public void setLayoutChangedListener          OnLayoutChangedListener layoutChangedListener                this layoutChangedListener   layoutChangedListener          public interface OnLayoutChangedListener       void onLayout boolean changed  int l  int t  int r  int b

User · Answer

In Kotlin file  change accordingly  Handler   postDelayed               Your Code             1

User · Answer

This works for me in my onClickListener   yourView postDelayed new Runnable                         Override     public void run                      yourView invalidate            System out println  Height yourView      yourView getHeight             System out println  Width yourView      yourView getWidth                             1

User · Answer

You can check this question  You can use the View s post   method

User · Answer

Use the ViewTreeObserver on the View to wait for the first layout  Only after the first layout will getWidth   getHeight   getMeasuredWidth   getMeasuredHeight   work   ViewTreeObserver viewTreeObserver   view getViewTreeObserver    if  viewTreeObserver isAlive        viewTreeObserver addOnGlobalLayoutListener new OnGlobalLayoutListener          Override     public void onGlobalLayout           view getViewTreeObserver   removeOnGlobalLayoutListener this         viewWidth   view getWidth          viewHeight   view getHeight

User · Answer

There are actually multiple solutions  depending on the scenario   The safe method  will work just before drawing the view  after the layout phase has finished    public static void runJustBeforeBeingDrawn final View view  final Runnable runnable        final OnPreDrawListener preDrawListener   new OnPreDrawListener              Override         public boolean onPreDraw                 view getViewTreeObserver   removeOnPreDrawListener this               runnable run                return true                       view getViewTreeObserver   addOnPreDrawListener preDrawListener        Sample usage      ViewUtil runJustBeforeBeingDrawn yourView  new Runnable              Override         public void run                   Here you can safely get the view size  use  quot getWidth quot  and  quot getHeight quot    and do whatever you wish with it                     On some cases  it s enough to measure the size of the view manually    view measure MeasureSpec UNSPECIFIED  MeasureSpec UNSPECIFIED   int width view getMeasuredWidth     int height view getMeasuredHeight      If you know the size of the container      val widthMeasureSpec   View MeasureSpec makeMeasureSpec maxWidth  View MeasureSpec AT MOST      val heightMeasureSpec   View MeasureSpec makeMeasureSpec maxHeight  View MeasureSpec AT MOST      view measure widthMeasureSpec  heightMeasureSpec      val width view measuredWidth     val height view measuredHeight   if you have a custom view that you ve extended  you can get its size on the  quot onMeasure quot  method  but I think it works well only on some cases     protected void onMeasure final int widthMeasureSpec  final int heightMeasureSpec        final int newHeight  MeasureSpec getSize heightMeasureSpec       final int newWidth  MeasureSpec getSize widthMeasureSpec       super onMeasure widthMeasureSpec  heightMeasureSpec        If you write in Kotlin  you can use the next function  which behind the scenes works exactly like runJustBeforeBeingDrawn that I ve written   view doOnPreDraw   actionToBeTriggered        Note that you need to add this to gradle  found via here    android       kotlinOptions           jvmTarget    quot 1 8 quot           implementation  androidx core core-ktx

User · Answer

Based on  mbaird s advice  I found a workable solution by subclassing the ImageView class and overriding onLayout     I then created an observer interface which my activity implemented and passed a reference to itself to the class  which allowed it to tell the activity when it was actually finished sizing   I m not 100  convinced that this is the best solution  hence my not marking this answer as correct just yet   but it does work and according to the documentation is the first time when one can find the actual size of a view

[android] Determining the size of an Android view at runtime

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