android - Programmatically adding ABOVE to LayoutParams causes view height to be 0 -


i have custom view. in constructor view, create , add 2 subviews. however, using layoutparams.addrule() causing problems. rules such center_horizontal work, when try use above, subview ends height of 0.

here code in constructor:

    setlayoutparams(new layoutparams(layoutparams.match_parent, layoutparams.match_parent));       mlayoutparams = new layoutparams(width, height);     mlayoutparams.leftmargin = left;     mlayoutparams.topmargin = top;      mimage = new imageview(getcontext());     mimage.setimagedrawable(getresources().getdrawable(r.drawable.my_image_drawable));     mimage.setscaletype(scaletype.fit_xy);     mimage.setid(r.id.my_image_id);     addview(mimage, mlayoutparams);      mtext = new textview(getcontext());     mtext.settext(r.string.my_text);     mtext.setid(r.id.my_text_id);     layoutparams textparams = new layoutparams(200, 40);     // textparams.addrule(center_horizontal, true); //works     textparams.addrule(above, mimage.getid()); //doesn't work      addview(mtext, textparams);

if inspect view on emulator device monitor, can see layout_height of text 40, top, bottom, , height parameters 0. measuredheight appears same screen width.

  1. am doing wrong adding rules?
  2. is there better place add rules? need happen first?
  3. any other alternatives? making textview have height of fill_parent, gravity bottom, , setting bottom margin height of image works, need able add view above text, , won't work that.

where in code checking height? if it's somewhere within oncreate or oncreateview, won't info. layout two-pass process , in 2 methods 2 passes not complete.

you may need height in methods using ".post" method this:

        myview.post( new runnable() {         @override             public void run() {                 int height = myview.getheight();             }          });

the runnable makes run on ui thread, it's invoked after both passes, measure pass , layout pass, have completed. trying set rule based on center horizontal without first knowing measurements going fail.


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