Android, scale drawable Image with ImageView

//> set height after ImageView draw.



   ViewTreeObserver vto = campaignImageView.getViewTreeObserver();

   vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {

       public boolean onPreDraw() {

        campaignImageView.getViewTreeObserver().removeOnPreDrawListener(this);

           

        float height = drw.getIntrinsicHeight();

     float width = drw.getIntrinsicWidth();

     

     float ratio = height / width;

     int imageViewHeight = (int) ( campaignImageView.getMeasuredWidth() * ratio);

     

     LayoutParams lp = new LayoutParams(

                   LayoutParams.MATCH_PARENT,

                   LayoutParams.WRAP_CONTENT);

     lp.height = imageViewHeight;

     campaignImageView.setLayoutParams(lp);

        

           return true;

       }

   });







http://stackoverflow.com/questions/4680499/how-to-get-the-width-and-height-of-an-android-widget-imageview