If you change the size of a child, you need to measure it with that size first.
On Sun, Sep 26, 2010 at 7:38 AM, John Gaby <jg...@gabysoft.com> wrote:
> I have a custom ViewGroup. The idea is to be able to place controls
> at absolute positions and then have the ViewGroup scale those controls
> based on the difference in the screen dimensions with respect to the
> original design dimensions. I am using the code below. In response
> to the 'onMeasure' message, I am storing the width and height of the
> view. Then on the 'onLayout' message I am computing new dimensions
> for the child controls and adjusting their sizes proportionally. This
> all works to some degree. However for certain controls (e.g. button
> controls), the control resizes, but the text inside does not remain
> centered within the control. I am thinking that there is some other
> call I need to make to update the child controls after I change their
> size.
>
> Any suggestions?
>
> Thanks
>
> @Override
> protected void onMeasure(int wid, int hgt)
> {
> super.onMeasure(wid, hgt);
>
> m_viewWidth = getMeasuredWidth();
> m_viewHeight = getMeasuredHeight();
>
> measureChildren(wid, hgt);
> }
>
> @Override
>
> protected void onLayout(boolean changed, int l, int t, int r, int b)
> {
> int count = getChildCount();
>
> for (int i = 0; i < count; i++)
> {
> View child = getChildAt(i);
>
> if (child.getVisibility() != GONE)
> {
> GViewGroup.LayoutParams lp = (GViewGroup.LayoutParams)
> child.getLayoutParams();
>
> int wid = child.getMeasuredWidth();
> int hgt = child.getMeasuredHeight();
> int lx = lp.x;
> int ly = lp.y;
> int ux = lp.x + wid;
> int uy = lp.y + hgt;
>
> if ((m_designWidth != 0) && (m_designHeight != 0) &&
> (m_viewWidth != 0) && (m_viewHeight != 0))
> {
> lx = (lx * m_viewWidth) / m_designWidth;
> ux = (ux * m_viewWidth) / m_designWidth;
> ly = (ly * m_viewHeight) / m_designHeight;
> uy = (uy * m_viewHeight) / m_designHeight;
> }
>
> child.layout(lx, ly, ux, uy);
> }
> }
> }
>
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--
Romain Guy
Android framework engineer
romain...@android.com
Note: please don't send private questions to me, as I don't have time
to provide private support. All such questions should be posted on
public forums, where I and others can see and answer them
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