getLayoutParams().height returns -2 even after onGlobalLayout()

Question

I have an android dialog which i want to position in a specific position in its window.

I'm using API 8

how come int a == -2 and int b == 153 are not positive?

what is the difference between

getLayoutParams().height;
    mToolTipLayout.getHeight();

I have the following code

  public void initViews(int orientation) {

    mToolTipLayout = ((LinearLayout) findViewById(R.id.tooltip_layout));

    ViewTreeObserver vto = mToolTipLayout.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
      @Override
      public void onGlobalLayout() {
        mToolTipLayout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
        setPosition();
      }
    });


  private void setPosition() {
    int a = mToolTipLayout.getLayoutParams().height;
int b = mToolTipLayout.getHeight();

  }

why not use PopupWindow which can be placed anywhere in screen. — Haresh Chhelana, May 14 '14 at 09:58
I would agree with using a PopupWindow for this behavior, but for calculation of a window, you should read the documentation. I believe its the onResume() in which the values for the LayoutParms actually get updated for the given view/window. — JoxTraex, May 14 '14 at 09:59
I think Dialog is by default shown screen center if you show such kind of popup/dialog at specific location then you prefer PopupWindow. — Haresh Chhelana, May 15 '14 at 06:57
A dialog should ONLY be used when you need the user to make a decision. If its just information being displayed then a PopupWindow should suffice. — JoxTraex, May 16 '14 at 05:37
@Haresh it says otherwise here: http://stackoverflow.com/questions/15165454/should-i-use-a-popupwindow-or-dialogfragment-for-accepting-input — Elad Benda, May 19 '14 at 11:34

score 3 · Accepted Answer · answered May 14 '14 at 10:02

3

Layout params specify how the measure and layout process should work. They are not updated in the measure/layout process. -2 is the value for WRAP_CONTENT.

The measures themselves are available in the views themselves, not their layout params. 153 is the measured pixel height in your case, measured with WRAP_CONTENT spec.

answered May 14 '14 at 10:02

laalto

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but what will getLayoutParams().height return when in the xml layout_height= "3dp" ? – Elad Benda May 14 '14 at 14:49
The requested height in pixels. – laalto May 14 '14 at 15:44
thanks. so in that case `getLayoutParams().height;` and `mToolTipLayout.getHeight();` return the same? – Elad Benda May 15 '14 at 06:45
Possibly but not necessarily - the measure process won't always give you exactly the specific size requested via layout params. – laalto May 15 '14 at 06:48

score 0 · Answer 2 · answered Jul 13 '18 at 12:25

Yes, -2 means WRAP_CONTENT. To get a height of a layout in this case you cannot use getLayoutParams().height or getHeight() (-2 and 0 respectively). You should get a height of inner view (for instance, with view.getLayoutParams().height). Probably add paddings.

getLayoutParams().height returns -2 even after onGlobalLayout()

2 Answers2