Hi Romain!
I know, thanks for the reminder! This is just while I am trying out
stuff to help me get the result that I want.
So far I am unsuccessful though. Any suggestions or pointers on how I
can make images draw where I want them to be?
I moved everything out of the onDraw method and now I have this:
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(mResizedBitmap, mXLocation, mYLocation, null);
}
with mResizedBitmap being the transformed image, and mXLocation and
mYLocation the coordinates I want the images to be in. But the images
are still all dumped onto the top-left corner of the screen.
The API for drawBitmap says "Draw the specified bitmap, with its top/
left corner at (x,y), using the specified paint, transformed by the
current matrix." But it doesn't do that. Is there any step I am
missing here?
Thanks!
- Zarah.
On Jun 23, 2:45 pm, Romain Guy <[email protected]> wrote:
> Never, ever, ever decode bitmaps from the onDraw() method. This is
> going to cause big performance issues.
>
>
>
>
>
>
>
>
>
> On Wed, Jun 22, 2011 at 11:41 PM,Zarah<[email protected]> wrote:
> > Hi again! I tried creating a custom View that extends View so I can
> > control how the image should appear and where it should appear.
>
> > I override the onDraw() method like this:
> > @Override
> > protected void onDraw(Canvas canvas) {
> > super.onDraw(canvas);
>
> > Bitmap bitmapOrg =
> > BitmapFactory.decodeResource(mContext.getResources(), mResourceID);
>
> > // ... set up image (scale, rotate, etc) ...
> > // (maybe this can be moved done before calling this method?)
>
> > canvas.drawBitmap(resizedBitmap, mXLocation, mYLocation, null);
> > }
>
> > It draws the image the size that I want it to be, at the coordinates I
> > want to be. So far, so good. I tried adding two instances of this
> > custom View and they appeared correctly. But I noticed that the bounds
> > of each image spans the whole screen, so I cannot capture which of the
> > two images was clicked.
>
> > I tried changing the custom View to inherit from ImageView instead,
> > and now the app can recognize which of the two images was clicked. BUT
> > it doesn't draw where I want it to draw. All images are dumped on the
> > upper left hand corner. :(
>
> > If I can merge the two results, it would be perfect (I think!) for
> > what I need.
>
> > Any thoughts? :)
>
> > Thank you so much!
> > -Zarah
>
> > On Jun 23, 11:45 am, Zsolt Vasvari <[email protected]> wrote:
> >> If you want the simplicity of View objects, use the layout_margin as I
> >> outlined above.
>
> >> The rotation should be doable via translation animations, if not, you
> >> can certainly set up a Timer and change the View margins so they
> >> appear is the new positions. Now, if you need to rotate each
> >> individual View so they appear as if they were on carousel, I am not
> >> sure how to do that. If they are just ImageButtons, you can probably
> >> rotate and change their Drawables.
>
> >> On Jun 23, 10:23 am,Zarah<[email protected]> wrote:
>
> >> > Hi Nik and Zsolt! Thanks for your responses!
>
> >> > Yeah, I would need to have the conveniences of View objects (listeners
> >> > and such). I would also need to be able to rotate the Canvas each time
> >> > the user clicks and drags on an image and still be able to track which
> >> > image was clicked.
>
> >> > -Zarah.
>
> >> > On Jun 23, 6:56 am, Zsolt Vasvari <[email protected]> wrote:
>
> >> > > But I think he wants the other niceties, such as the visible state
> >> > > changes, etc, at least that way my impression. Those things aren't
> >> > > trivial to implement.
>
> >> > > Of course, if that's not a requirement, just use a Canvas object.
>
> >> > > On Jun 22, 10:15 pm, niko20 <[email protected]> wrote:
>
> >> > > > I would suggest using a Canvas and just drawing yourself. Then in the
> >> > > > onTouch handler just do the match to find which circle was clicked.
> >> > > > You could use RelativeLayout too if you wanted to use views.
>
> >> > > > -nik
>
> >> > > > On Jun 22, 5:56 am, Zsolt Vasvari <[email protected]> wrote:
>
> >> > > > > Yes, looks like it is. Sorry, I didn't know that as I've never
> >> > > > > used
> >> > > > > AbsoluteLayout.
>
> >> > > > > I guess you could use FrameLayout and then give each view an
> >> > > > > appropriate layout_marginLeft and layout_marginTop.
>
> >> > > > > On Jun 22, 6:44 pm,Zarah<[email protected]> wrote:
>
> >> > > > > > Hi Zsolt!
>
> >> > > > > > But isn't that deprecated already?
>
> >> > > > > > -Zarah.
>
> >> > > > > > On Jun 22, 6:40 pm, Zsolt Vasvari <[email protected]> wrote:
>
> >> > > > > > > Use an AbsoluteLayout
>
> >> > > > > > > On Jun 22, 6:33 pm,Zarah<[email protected]> wrote:
>
> >> > > > > > > > Hi guys,
>
> >> > > > > > > > This is such a n00b question but I hope someone helps me. :)
>
> >> > > > > > > > I have always made apps that make use of traditional widgets
> >> > > > > > > > so when
> >> > > > > > > > it comes to things like this I am totally at a loss. :(
>
> >> > > > > > > > Anyhooo, my aim is to display a set of images of beads into
> >> > > > > > > > a circle
> >> > > > > > > > (sort of forming a bracelet), with each bead being
> >> > > > > > > > clickable. Some of
> >> > > > > > > > the beads are not perfect spheres (some are oblong-ish), so
> >> > > > > > > > I would
> >> > > > > > > > have to rotate the images by some degrees to either left or
> >> > > > > > > > right to
> >> > > > > > > > make them look like they are stringed together.
>
> >> > > > > > > > I don't have an idea how to start doing this because I don't
> >> > > > > > > > know how
> >> > > > > > > > I should tell the OS where to place the images. Should I use
> >> > > > > > > > a Canvas?
> >> > > > > > > > Learn OpenGL?
>
> >> > > > > > > > If I use a Canvas, I would end up having a bitmap with all
> >> > > > > > > > the images,
> >> > > > > > > > right? Can I still make the images clickable?
>
> >> > > > > > > > If I use OpenGL, is it an overkill? The main animation I
> >> > > > > > > > would have to
> >> > > > > > > > do is simply have the circle rotate when the user clicks and
> >> > > > > > > > drags on
> >> > > > > > > > a bead.
>
> >> > > > > > > > Thank you in advance!
>
> >> > > > > > > > -Zarah.- Hide quoted text -
>
> >> > > > > > - Show quoted text -- Hide quoted text -
>
> >> > > > - Show quoted text -- Hide quoted text -
>
> >> > - Show quoted text -
>
> > --
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>
> --
> Romain Guy
> Android framework engineer
> [email protected]
>
> 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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