I have a specific goal regarding animation using Recyclerview, but I cant find an exact title to convey my concern, so I'm open to any correction if necessary. So first , I have a recyclerview that acts as a ViewPager thanks to David Medenjak's Recyclerview ViewPager
Now I have a requirement to animate the background color for each swipe transition, thanks to different links and resources, I stumbled upon TransitionDrawables, putting an array of different drawables and invoking a necessary transition functions to animate,
recyclerView.setBackground(arrayOfDrawables)
transitionArrayOfDrawables.startTransition(...);
Now I want to take things deeper, I want to manually control the transition relative to the animation of the swipe of each item of the recyclerview, Im mentally blocked as I cant find the keyword to search for where should I start, "Interpolation", "Manually interpolating a views animation", things like that, but still no luck, the only thing that I have on my mind is "Get the recyclerview's visible item's interpolation/animation-value then supply it to the target view's animation manually", but I dont know where to start, I dont even know how to animate view's manually, I have experience with ObjectAnimators, simple translating, scaling, bouncing etc.. but controlling view's animation manually and relatively even by using knob/seek bar or such, its just out of my domain as of the moment.
Any help would be greatly appreciated.
[Edit] Apologies if my question's intent covers alot of demands :(
If I am understanding correctly, this link may be of some use. It provides instruction for how to gradually transition between viewpager background colors in relation to the user swipe.
The example uses the ArgbEvaluator class which -according to the doc: "...perform[s] type interpolation between integer values that represent ARGB colors."
Related
I am trying to design a complicated parallaxing animation that resides inside a ViewPager. The animation uses onPageScrolled function's offsetPixel to calculate the position of the images.
However this approach is causing a lot of problems due to the offsetPixel if scrolled fast can skip (ex: 1 to 123 to 250 to 251) and when slow it's too sensitive so the animation seems jittery.
Is there a better way to calculate the position of the screen besides offsetPixels. If so, can anyone please help me figure it out. Would appreciate it very much!
Thank you.
Well, I don't know exactly if one of the pages has to have the parallax effect, or it has to been a parallax effect between de transition of changing pages.
I developed a small library to make the second one, https://github.com/xgc1986/ParallaxPagerLibrary
Demo: parallax demo
This library work with Views, the you can use it with imageViews to have the effect.
To do that I don't use de onPageScrolled function, basically then you don't permit to the developer to use this listener anymore, the to solve that I implemented a child of PageTransformer
I want to implement view like this:
Inside of this view all children has to be animated while scrolling through them.
I am going to implement it for android 2.x
My first thought was to create custom view extending FrameLayout and manage children views inside programatically, detect gestures and move to next/prev child view animating them (probably scale and transition animation)
What can you advice me, how to achive that, maybe there is an open source project that can help me?
Finally I got what I wan't, there is no simple answer on this question, but simply saying you have to all the work that android UI framework usually does: calculate position of items, add them in proper order, apply different effects (translate, scale, fade out) and draw it on canvas.
To achiev this I follod this extremely useful tutorial (thanks to author)
http://blogs.sonyericsson.com/wp/2010/05/20/android-tutorial-making-your-own-3d-list-part-1/
I am thinking to add my solution somewhere on github once I fix all bugs and make it completelly reusable.
I was wondering if there is a way that I can animate my GridView's Children to their new positions. So, for example, slide in from the left and when at the end of a row, slide off to the right. This will give the effect of each child moving to its new position, rather than just appearing there.
I have looked around, and could not find any useful information. Ideally a small code sample will get me on my way.
Thanks
You should consider using GridLayoutAnimationController. GridLayoutAnimationController docs
You may try looking at this video:
http://www.youtube.com/watch?v=X984r7IOrgc
The developer somehow shares how he had implemented the animation in his reply on one of the comments. He could not show the source code yet though. Hope this helps.
i used android canvas and some code for positioning image tiles. it
uses and data adapter pattern (like for all AdapterViews). each tile
has it's position - page, row and column. draging changes tiles
positions. - karooolek
There are a few animations in the Android API Demo, including some animations for gridview.
You might want to check the examples in com.example.android.apis.view.
I have a text view where in i have to keep ages between 1-99. I also have two buttons ^ and v(i mean up and down arrows) on clicking them the values of the age should smoothly scroll to next or previous value.
I have been trying different ways but couldnt achieve smooth scrolling. Can anyone please give me any idea of how to achieve the task.
I think the easiest way is to simply put the TextView within a ScrollView, and let the arrows interact with the ScrollView, by using things like the fling method and playing around with the velocity parameter to suit your needs.
Use the animation framework.
When pressing down, start the 'down'-animation.
When pressing up, start the 'up'-animation.
Read more about animation here: http://developerlife.com/tutorials/?p=343
View animation is not much matured and hence i am noy sure if that can be used for moving the views.
Please find the description below:
Another disadvantage of the view
animation system is that it only
modified where the View was drawn, and
not the actual View itself. For
instance, if you animated a button to
move across the screen, the button
draws correctly, but the actual
location where you can click the
button does not change, so you have to
implement your own logic to handle
this.
Source
To scroll smoothly you can try using the scroller component.
Reference
What you would need to do is pass the duration of the scroll in the constructor and then use the property
setFinalY(int newY)
to increment the counter position by 1 unit (equal to the height of the item).
Please let me know if that helps!
I've just started playing with Android in the last few days and have begun to put together a simple application. I am struggling to work out whether I'm doing things the "right" way or just making life difficult for myself.
The app displays a series of connected nodes on the screen, similar to a mind-map. I want to be able to tap the nodes in order to edit them. When the map of nodes becomes larger than the screen, I need to be able to scroll on both X and Y axes as needed to see the whole map. Image of current implementation at http://ubergeek.org.uk/images/nodetest.png.
Currently I don't have scrolling working, however I assume that I can do that by making the root view a ScrollView and sticking an AbsoluteLayout inside that (though it's deprecated, I wish to place objects at specific X/Y coordinates).
The nodes themselves are currently each a pair of roundrects (one for the outline and one for the fill) and a drawText and are being drawn in the main activity's onDraw(). In order to make these clickable buttons I believe I need to create a custom view for the button in order to use its onClick() events. I can then create a view object for each of my nodes and add them to the AbsoluteLayout view.
Does this sound like a reasonable way to do it in Android, or is this a horrible abuse of the API? :)
Thanks!
Nope, that sounds about right. You just need to make sure that the view contained by the ScrollView has the right dimensions so the scrollbars will show up right, but I'm sure you got that covered.
It's certainly a bit non-standard, but I'm tempted to say that your approach will work right... I'd even go so far as to say that it's not a hack. Please keep us posted on how it works out, and if anything breaks!
(Btw, the SDK mentions that you should write your own layout instead of using AbsoluteLayout. Personally, I'd say use the AbsoluteLayout.)