Android get layout height and width in a fragment

Question

I am working on a fragment and I want to get the dimension of a layout contained in the xml fragment layout. When I try the code

RelativeLayout myLayout = view.findViewById(R.id.myLayout);
myLayout.getHeight();

it returns 0. I need these dimensions to put inside myLayout other objects.

I try to use:

myLayout.getViewTreeObserver().addOnGlobalLayoutListener( 
    new ViewTreeObserver.OnGlobalLayoutListener(){

        @Override
        public void onGlobalLayout() {
            mHeight = myLayout.getHeight();  
            mWidth= myLayout.getWidth();
            System.out.println("width: "+mWidth+"   height: "+mHeight);
         }
});

but this code is invoke a lot of time and I don't know exactly when it is execute. I need these dimensions into public void onActivityCreated () method. Is it possible?

what is myLayout..mention that code – Sam Jun 05 '13 at 10:56 — Sam, Jun 05 '13 at 10:56
It si reference of a relative layout declared in XML – lory105 Jun 05 '13 at 11:11 — lory105, Jun 05 '13 at 11:11

score 38 · Answer 1 · edited Jun 05 '19 at 04:37

38

There's a cleaner solution to this, just use the View.post() method on your fragment's root view, and you can call getMeasuredHeight()/getMeasuredWidth() and get the actual values.

E.g.

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View root = inflater.inflate(R.layout.myfragment, container, false);

    root.post(new Runnable() {
        @Override
        public void run() {
            // for instance
            int height = root.getMeasuredHeight(); 
        }
    });

    return root;
}

Very neat and tidy and no messy mucking about with the ViewTreeObserver.

I've only tested this with android-23 devices, but the API has had this method since level 1.

Anyway, WFM.

edited Jun 05 '19 at 04:37

ᴛʜᴇᴘᴀᴛᴇʟ

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answered Feb 25 '16 at 19:16

Staffan

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I think you can use onViewCreated if you need the measure from the fragment class and not from the activity – Fernando Gallego Apr 20 '16 at 14:26
1

@FernandoGallego No, in `onViewCreated` width and height return 0. – Minas Mina Aug 09 '17 at 08:11
Is this documented behavior? – funct7 Dec 13 '21 at 21:47
@funct7 is what documented? That getMeasuredHeight() isn't available until it's visible or View.post? – Staffan Dec 15 '21 at 18:39

score 11 · Answer 2 · answered Feb 09 '14 at 08:04

The addOnGlobalLayoutListener will be called whenever small change of the view happened. So you need to remove this listener from the view.

Simple usage:

public static void removeOnGlobalLayoutListener(View v, ViewTreeObserver.OnGlobalLayoutListener listener){
if (Build.VERSION.SDK_INT < 16) {
    v.getViewTreeObserver().removeGlobalOnLayoutListener(listener);
} else {
    v.getViewTreeObserver().removeOnGlobalLayoutListener(listener);
}

}

I would suggest you to check :

if (myLayout.getHeight()>0 && myLayout.getWidth()>0) {
// Do some code...
removeOnGlobalLayoutListener(..)
}

score 2 · Answer 3 · edited Feb 09 '14 at 07:47

2

In onActivityCreated, the view hasn't been measured yet.

So no, you can't get the measurements from there. onGlobalLayout is a good place to do it. Layouts happen directly after measurement.

You can remove your listener afterwards, if you only want to do it once. Note that layouts can change size though (soft keyboards appearing, for example)

edited Feb 09 '14 at 07:47

Shiva Saurabh

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answered Jun 05 '13 at 11:14

Bradley Campbell

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Android get layout height and width in a fragment

3 Answers3

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