Develop Reference

How to implement animations/transitions in Android

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."

How to implement an App Intro with Shared View animation

I am trying to implement an application intro something like in the attached gif.
I know Shared animation isn't supported in Viewpager but I really need to have something like that.
Any help would be appreciated. 

One way would be to draw the animating view in top of view pager using framelayout. And then animate it using scale animation and translate animation when view pager moves..

I am answering my own question just to help others who are looking for the same.
I have found the library for such kind of animation. Below mentioned is the github link
https://github.com/IFTTT/SparkleMotion
However, I used the suggestion given by PrafulBhatnagar and used some overlay views while hiding the actual page views during the viewPager's scrolled/fling state.

Flip View like in Contacts Activity (ICS) or Google+ App

I am searching for an easy way to implement a view flipping like used in several occasions by google apps.
Behaviour should be like this: OnScroll the view should move to the side and show the content of the next page. If scrolled far enough the view should move smoothly into position (after lifting your finger) and snap into place. If not scrolled far enough and the finger is lifted, the original view should smoothly move to the original view and snap into place.
I search around and didn't figure out a easy way.
So I though about something like this:
Hide the ScrollBars of the horizontal ScrollView.
Set the scrollView position manually according to the position I get from a GestureDetector.
I am pretty sure that this way works. But it seems to complicated to me, because there are to many things that have to be programmed. Like the animation (Smooth acceleration, deceleration, snap), Gesture, calculation of the actual position....
So my Question: Am I on the right way or is there an easier approach? Did I miss something during I searched for a solution? Is this function already implemented by android or does it really have to be done by myself?

Look for this tutorial. Also if you try to search here, on SO, you will find thousands of similar question with lots of different solutions. You can choose one, that will useful for you.

Animate GridView Children

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.

How to transition between data in a single dynamic view in Android

Let me start out by saying that I feel like there should be a very simple way to do this, and it's entirely possible I'm missing something very simple. But all the examples I find for transition animations (push left out, push right in, etc.) deal with moving from one view to another. What about an application that only has one view, but dynamically changes the data feeding that view?
The best common example of this is the base calendar app. It has identical views, but when you swipe forward or backward the date of the view transitions with a swipe animation.
How do I reproduce this? Surely I don't have to inflate ViewFlippers for the same view? And if so, what is the best way to go about this?
Thanks in advance.

The source code for Android can be found on source.android.com, and the project for the Calendar application can be found here.
From the looks of things, they use a ViewSwitcher to process the animations, triggering an animation based on a fling gesture. It's rather complicated, which is why this is on my list of reusable components to write one of these days...

A kind of hacky way of doing this would be to set the layoutAnimation of your view (in XML or Java) and simply remove the view from your window, then edit the data, then re-insert it in to the window again. This will call a layoutAnimation to happen. Note however that with this implementation you can't do remove animations.
You could also use the standard animation framework to transform the view off the screen. Once it has finished that, edit the data of the view. Once that is finished, set another animation on the view to slide back in again.