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

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?

In Kotlin file, change accordingly

 Handler().postDelayed({

           Your Code

        }, 1)

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;
        }
    }

You can check this question. You can use the View's post() method.

There are actually multiple solutions, depending on the scenario:

1. 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 "getWidth" and "getHeight"), and do whatever you wish with it
        }
    });

2. 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

3. if you have a custom view that you've extended, you can get its size on the "onMeasure" 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);
}

4. 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 = "1.8"
    }
}

implementation 'androidx.core:core-ktx:#.#'

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

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]
            }

        }
    });
}

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());
}

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();
    }
  });
}

Here is the code for getting the layout via overriding a view if API < 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);
}

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.

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);