I just put harcoded fake values for time being, instead of centering.
I was expecting everything embedded with the linearlayout which is my
main layout to be shrunk by the top and bottom margins I specified.
On Nov 22, 1:25 pm, rukiman <ruksh...@optushome.com.au> wrote:
> I thought I'd create my own specialized LinearLayout so that I can
> calculate the aspect ratio and center vertically. My game is only
> designed to be played in portrait mode. However this code doesn't seem
> to work. Spot what I am doing wrong?
>
> import android.content.Context;
> import android.util.AttributeSet;
> import android.view.ViewGroup;
> import android.widget.LinearLayout;
>
> public class SpecialLinearLayout extends LinearLayout {
>
> private final Context context;
>
> public SpecialLinearLayout(Context context, AttributeSet attrs) {
> super(context, attrs);
> this.context = context;
> }
>
> protected void onLayout(boolean changed, int l, int t, int r, int
> b) {
> int width = r - l;
> int height = b - t;
> float aspect = 480.0f / 320.0f;
> int newheight = (int) Math.floor((float) width * (float)
> aspect);
> if(newheight != height) {
> // create top margins to center vertically
> ViewGroup.MarginLayoutParams margin = new
> ViewGroup.MarginLayoutParams(this.getLayoutParams());
> margin.setMargins(0, 40, 0, 50);
> this.setLayoutParams(new LinearLayout.LayoutParams
> (margin));
> }
> }
>
> }
>
> On Nov 22, 11:26 am, Mark Murphy <mmur...@commonsware.com> wrote:
>
> > rukiman wrote:
> > > This is working almost 90% for my game except when testing in WVGA
> > > screen resolution, all my images are scaled incorrectly, it is longer
> > > vertically than horizontally. I was expecting the screen compatibility
> > > to maintain aspect ratios as that of HVGA.
>
> > No.
>
> > "DROID has been optimized to display wide-screen multimedia (movie)
> > content at its native aspect ratio of 16/9. This is different from the
> > HVGA aspect ratio of 3/2, which is the traditional computer screen
> > format. What this means is that when content is scaled up to "full
> > screen", the horizontal (X*1.5) and vertical (Y*1.77) scaling factors
> > are different. As a result, when displaying the same bitmap as a full
> > screen background, round circles can appear as ovals, and squares are
> > elongated to rectangles."
>
> >http://developer.motorola.com/docstools/library/Support_for_Multiple_...
>
> > I have no reason to believe this is DROID-specific, but rather is how
> > Android scales things in WVGA800/WVGA854, when you do not supply your
> > own pre-scaled resources.
>
> > > Also in my layout I have a scrollview and it is designed in such a way
> > > that in HVGA when it is not scrolled down, the items are hidden away,
> > > however now in WVGA those things are shown. If the aspect ratio of
> > > HVGA is maintained I won't have this issue.
>
> > > How can I make sure the aspect ratio is maintained?
>
> > You cannot control the aspect ratio, as that is dictated by the physical
> > parameters of the screen. AFAIK, there is no Android equivalent of
> > "letterbox" that would put black bars on either side of your app and
> > give you a smaller virtual screen with 3/2 aspect ratio.
>
> > > Also in my layout I am positioning some items using pixel positions.
> > > Should I convert these to dpi?
>
> > If you mean dip (density-independent pixels), perhaps. It depends on
> > what the pixels represent. There is no hard-and-fast rule.
>
> > > How do I calculate what dpi they should be?
>
> > 1px = 1dip at 160dpi (i.e., traditional "normal" screen density).
>
> > --
> > Mark Murphy (a Commons
> > Guy)http://commonsware.com|http://twitter.com/commonsguy
>
> > _Android Programming Tutorials_ Version 1.0 Available!
--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
