If you're making a game I understand why the AnimationDrawable wasn't working. You can indeed draw it onto the Canvas directly but for the drawable to animate you have to give it a Drawable.Callback. A View is Drawable.Callback. What is going to happen is that the AnimationDrawable will draw its first frame and then call invalidateDrawable() on its callback. That in turns will trigger the drawing of the next frame of the animation. If you use an AnimationDrawable without setting its callback (see Drawable.setCallback()) then nothing will happen, unless you call invalidate() yourself on your views or reforce the drawing of the AnimationDrawable onto the Canvas.
The reason why ImageView works is because when you set a Drawable onto a View, the View is automatically set as the Drawable's callback. On Sat, Jan 24, 2009 at 5:55 PM, Brendan <[email protected]> wrote: > > I got it working! > > Your advice actually sent me in the right direction. Just having > something that inherits from ViewGroup and adding the ImageView to it > totally works just like you'd expect. You can then implement your own > custom View that is also added to ViewGroup that does drawing to the > canvas. > > Thanks again for helping me through the frustration! > > > On Jan 24, 5:26 pm, Brendan <[email protected]> wrote: >> Thanks for the response, but maybe I should mention that I'm trying to >> make a game here, so one of the big things is that I'm going to have a >> lot of bitmaps interacting with each other and their positions a lot. >> Given that extra knowledge, doesn't it make sense to use a Canvas? >> >> On Jan 24, 4:59 pm, Romain Guy <[email protected]> wrote: >> >> > Hi, >> >> > Views can be added to a ViewGroup. All layouts (LinearLayout, >> > FrameLayout, etc.) are ViewGroups and offer the addView() method. From >> > your message, I feel like you are taking a complicated approach. It's >> > actually pretty simple: >> >> > Create a layout (let's say a FrameLayout) >> > Create an ImageView >> > Set your AnimationDrawable as the ImageView's image >> > Put the image view inside the FrameLayout >> > Set the FrameLayout as the content view >> >> > There is no need to use a Canvas or to call a system service. Several >> > example in ApiDemos show how to use addView() btw. >> >> > On Sat, Jan 24, 2009 at 4:53 PM, Brendan <[email protected]> wrote: >> >> > > Ok, all I'm trying to do is figure out how to create a working >> > > AnimationDrawable in the code without XML. Can it really be that hard? >> > > I continue to run into issues with examples that are not complete >> > > enough (the samples provided in the SDK don't even have comments other >> > > than the copyright notice most of the time) and documentation that is >> > > out of date. >> >> > > So the first thing I tried was just to make an AnimationDrawable, add >> > > frames to it, draw it to the canvas once a loop, and start it. But >> > > wait, turns out there's a bug with starting it within the same context >> > > as when the Activity starts. So I wait until the window gets >> > > focus...still only the first frame appears. I begin investigating and >> > > see that maybe I have to add the AnimationDrawable to an ImageView, so >> > > I do that and draw the ImageView to the canvas...and it's no better. >> > > Now I'm thinking that the ImageView I added it to has to be added as a >> > > child view to the actual view so I'm trying to figure out how to do >> > > that. My first guess was just to do a view.addView(ImageView) but that >> > > method doesn't exist (although I've seen it referenced a bunch of >> > > places). This leads me to find out about the ViewManager, which >> > > actually has an addView method. The official documentation page for it >> > > () even says: "To get an instance of this class, call >> > > Context.getSystemService(http://code.google.com/android/reference/ >> > > android/view/ViewManager.html)." But guess what? >> > > Context.getSystemService() needs a string for an argument, and >> > > although there are string constants for all sorts of managers to grab >> > > (http://code.google.com/android/reference/android/content/ >> > > Context.html#getSystemService(java.lang.String) guess which one isn't >> > > included in the list? That's right, the ViewManager. >> >> > > AAAAAAAHHHHHHHHHHHHHHHHH! >> >> > > I've run out of ideas. Seriously, is this documentation incredibly out >> > > of date? Is AnimationDrawable just broken? I've tried everything I can >> > > think of. >> >> > > If anybody can just provide a simple example of how to get frame-by- >> > > frame animation up and running it would be greatly appreciated. >> >> > > Full disclosure: I posted previously about this same thing with some >> > > code (http://groups.google.com/group/android-developers/browse_thread/ >> > > thread/46f0b91c8af70e4a) but no one has responded. >> >> > -- >> > 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 > > > -- 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. 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