How to change transition animations step by step

Changing transition animations might seem trivial until you encounter a specific problem: Your character is unresponsive, the interface freezes mid-animation, or the app isn't doing exactly what you expect.Whether you come from the world of video games (Unity, Unreal, etc.) or Android development or video editing, transitions have a much greater impact than you might think on the feeling of fluidity and control.

In this article we are going to put several pieces together: How to manage transitions between character animations, how design transitions work on Android, what you can do in video editors like Filmora, and what limitations some launchers or environments impose.Everything explained in Spanish from Spain, with clear examples and without leaving out any important details from the original information.

The typical problem: changing animations while you're already in a transition

A very common case in video games or character animations is this: You have animations for running, standing still, and, for example, rolling, with smooth transitions between them.Each transition has its exit time disabled so that, when a condition is met (releasing a key, activating an action, etc.), the change is immediate.

This works great when You go directly from one animation to anotherFor example, going from still to running or from running to rolling. The trouble starts when you try to switch to a new animation in the middle of a transition already in progress. Imagine:

• Your character runs.
• You stop pressing the movement button and a slow transition from running to standing still is triggered so that it doesn't stop abruptly.
• At that moment, you press the roll button.

What's happening? The character doesn't roll until the transition from running to standing still is complete.In other words, the "long" transition blocks any other animation you might want to activate midway through. The animation engine is in the middle of the transition and, as currently configured, doesn't allow you to "jump" to another animation immediately.

In many animation systems, You cannot create transitions from within a transition (that is, from the transition state itself), or they're not designed to be used that way. What you basically want is to be able to Cancel the current transition when new entry conditions to another animation are met..

Conceptual approach to canceling or overwriting animation transitions

Regardless of the specific engine (Animator Controller, state machines, etc.), the general idea is the same: The transition should not behave like a dead end.You should be able to interrupt it when there is a more pressing task.

Some common strategies to achieve this are:

• Add intermediate states or mix animations instead of a single rigid "run to stand still" transition. For example, a "braking" state that can jump to "rolling" if the button is pressed in time.
• Modify the transition conditions to allow the roll animation to take priority over any ongoing transition. On many systems, this involves marking the transition as "may interrupt" or setting a priority.
• Shorten or adjust the mixing time (blend) between animations so that the transition blocking is as small as possible.
• Prevent the transition from becoming an opaque stateInstead of considering it a tunnel, you treat it as a section that continues to monitor user inputs and can jump to another animation when conditions change.

The key is that The animation state machine must be able to react even during the transitionIf your system doesn't allow you to create a transition from within the transition, the solution usually involves restructuring the states (creating more explicit states instead of relying so heavily on a single long transition) or adjusting the input logic.

Design transitions in Android: how to switch from one interface to another with animations

On the app development side, Android offers a A transition framework that allows you to animate changes in the user interface between two view layouts.The system is responsible for interpolating between an initial and a final design, applying effects such as fades, resizing, or view movements.

This framework gives you several important advantages: Animate entire groups of views at once, use predefined animations, load everything from XML resources, and hook into transition lifecycle callbacks. to have more control over the process.

Scenes: capturing the state of a view hierarchy

A "scene" in Android is, basically, A snapshot of the state of a view hierarchy: what views are present and what property values ​​they have.The system can animate the changes when you move from one scene to another. You can create scenes from:

• A design file (XML layout), which is inflated and associated with a root ViewGroup.
• A ViewGroup created or modified in code, when you generate the hierarchy dynamically.

Normally, The initial scene is automatically inferred from the layout that is already on screen.In other words, you don't have to create it manually: the framework looks at the interface and uses it as a starting point for the transition.

The idea is that you can tell the system, "This is my interface now, this is how I want it to look, and this is the transition I want to use between the two." From there, TransitionManager is responsible for animating from one state to the other.

Create scenes from design resources

If your interface is fairly static, it's very practical. define the different scenes as separate XML design files. For example: uterine

• A main activity layout with a title and a FrameLayout which will serve as a container for scenes.
• A layout for the first scene (a_scene.xml), with two TextView arranged in a certain way.
• Another layout for the second scene (another_scene.xml) with the same IDs, but in a different order.

In the layout of the main activity you would have something like: a LinearLayout with a TextView fixed (the title) and a FrameLayout (@+id/scene_root) where the first scene is embedded. That FrameLayout It acts as the scene root, and it is on this that the transitions are applied.

Then, in your code, you retrieve that root with findViewById(R.id.scene_root) and you create two objects Scene different using Scene.getSceneForLayout(), one for each XML. Both share the same root, but represent different arrangements of the views.

Create scenes directly in code

When the interface is very dynamic (you add and remove views in real time), it's convenient for you Create the scene from a ViewGroup and a view hierarchy that you have built yourself in codeFor that you can use the constructor:

Scene scene = new Scene(sceneRoot, viewHierarchy)

This is equivalent to use Scene.getSceneForLayout() with an inflated layoutBut without needing an intermediate XML file. This is useful when the UI changes so much that maintaining static layouts would be cumbersome.

Actions upon entering and exiting a scene

Besides the animation itself, a scene can define custom actions that are executed upon entering or leaving itThis is done with setEnterAction() y setExitAction(), to whom a Runnable.

These actions are useful, for example, for:

• Animate or modify views that are not part of the same hierarchybut you want to coordinate with the scene change.
• Addressing cases where the framework cannot automatically animate, such as certain types of lists.

Yes, It's not a good idea to use these actions to pass data between scenes.For that type of logic, it's best to rely on transition lifecycle callbacks, such as those offered by TransitionListener.

Transitions in Android: types, creation and application

Once you have defined the scenes that represent the initial and final states, you need an object Transition, which defines the type of animation that will be appliedAndroid comes with several built-in transitions and also allows you to create your own.

Main integrated transition types

Among the most used classes in the Android transitions framework are:

• AutoTransition: combines fade out, move/resize, and fade in in that order. It's the default transition and works for many general cases.
• ChangeBounds: animates changes in position and size of the views.
• ChangeClipBounds: captures and animates the clipping boundaries (clipBounds) from a view.
• ChangeImageTransform: encourages changes in the transformation matrix of a ImageView.
• ChangeScroll: encourages changes to the scroll properties of the target views.
• ChangeTransform: focuses on changes in scale and rotation of views.
• Explode: moves the views inwards or outwards from the edges of the scene when they change visibility.
• Fade: allows you to do fade in and fade outBy default, it combines both.
• Slide: makes views appear or disappear by sliding from a specific edge.

With these pieces you can cover most needs: from a simple fade between views to more complex movements with changes in size and position.

Create a transition from XML resources

If you want to separate the "how it's animated" from your code, you can define transitions in XML files within the directory res/transition/For example, to create a transition of type Fade All you need is an XML file like this:

<fade xmlns:android="http://schemas.android.com/apk/res/android" />

Then, from your activity, You inflate that transition with TransitionInflater.from(context) and you apply it like any other transitionThis allows you to change animation parameters without touching the Java/Kotlin code.

Create the transition directly in code

Whether the transition is simple or you need to create it dynamically, you can instantiate it directly in code with its constructor. For example: uterine

Transition fade = new Fade();

From there, You can customize it (duration, targets, etc.) and pass it on to TransitionManager when you want to start the animation between scenes.

Apply the transition between two scenes

To change from one scene to another with animation, the typical pattern is:

1. Define the final scene (either from XML or from code).
2. Create or inflate the transition that you want to apply.
3. Call to TransitionManager.go(sceneFinal, transition).

The framework is responsible for Replace the view hierarchy of the root element with that of the final scene while animating any detected changes. The initial scene will be the one used in the last transition or, if there is no precedent, the current state of the UI.

If you don't pass any item Transition, the system It applies a "reasonable" automatic transition for most cases.which basically acts as a AutoTransition.

Choosing which views to animate: transition targets

By default, a transition is applied to all the views that change between the opening and closing scenesBut sometimes you're not interested in animating everything, or you want to avoid elements that cause problems.

With the methods addTarget() y removeTarget() You can decide which specific views will be part of the animation. This is done before starting the transition, and it only affects views that are within the hierarchy associated with the scene.

This filtering is important because Some types of views don't work well with the transitions framework., especially those based on adapters, as you will see below in the limitations section.

Combine multiple transitions with TransitionSet

You're not limited to a single animation. Android allows group several transitions into one TransitionSetThis is useful, for example, for:

• First, do a fade out of some views.
• Then encourage changes in size and position.
• And finally, do a fade in of the new content.

In fact, a combination of this style is exactly what it does internally AutoTransition: A Fade to fade away, ChangeBounds to move and resize, and another Fade to appear.

To define a set of transitions in XML you can use something like:


<transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
android:transitionOrdering="sequential">
<fade android:fadingMode="fade_out" />
<changeBounds />
<fade android:fadingMode="fade_in" />
</transitionSet>


Then it inflates like any other transition and it goes to TransitionManager no differences with respect to a single transition.

Apply transitions without scenes: direct changes to the view hierarchy

It doesn't always make sense to define multiple scenes. Often, one is enough. a single layout where you add, remove, or modify views in real timeImagine a search screen where:

• You have a text field and a search button.
• When the user presses search, the button disappears and the results appear.

Instead of defining two almost identical scenes, it is more comfortable work with a single layout and let the framework animate the changes you make in the codeThat's what it's for. beginDelayedTransition().

The process is:

1. Call to TransitionManager.beginDelayedTransition(root, transition) when the event that needs to be animated is triggered. The framework saves the current state of the views within root.
2. Make the necessary changes in the views: add, delete, change properties, etc.
3. When Android redraws the interface, It will automatically apply the transition between the previous and new states..

For example, in a ConstraintLayout defined in activity_main.xml with a EditText and other elements, you could Add a new text view with animation simply by wrapping your changes with beginDelayedTransition(), without additional scenes.

Transition lifecycle callbacks

The life of a transition has clear stages: It starts when you call go() o beginDelayedTransition() and ends when the animation is completeTo react to these moments, there is the interface TransitionListenerwhich offers you several methods such as:

• onTransitionStart(): when the transition begins.
• onTransitionEnd(): when the entire animation process is finished.
• Other methods for cancellations, pauses, etc.

These callbacks are very useful for cases where you need copy data or states between the initial and final hierarchyFor example, if you want to preserve a value from a view that disappears and apply it to another that appears, but the "final" view does not yet exist until the scene change is complete.

The typical technique is: store the value in a variable when the transition starts and apply it to the corresponding view when you receive onTransitionEnd()This way you maintain consistency without fighting with views that aren't yet in the tree.

Limitations of the Android transitions framework

Although it is very powerful, the Android transition system has Several limitations to keep in mind so you don't go crazy looking for bugs where there are none:

• SurfaceViewAnimations on this type of view may not display correctly, because they are drawn from a different thread than the UI and the result may become desynchronized with the rest.
• TextureView: some transitions may not produce the expected effect or may behave inconsistently.
• Views that extend AdapterView (as ListView)They manage their children internally and are not compatible with the transition model. Encouraging them may cause freezes or the screen to become unresponsive.
• Resize TextView with animationIf you resize a text view during a transition, the text may reposition itself before the resizing is complete, creating an odd effect. It's recommended not to animate resizing in views containing text if you want to avoid these glitchy effects.

Change transition animations in Android launchers and skins

Another area where people often want to change transitions is the system interface or the launcher itself (for example, animations when opening apps, switching desktops, etc.). Some third-party launchers such as Nova Launcher They've been offering a lot of options for this for years.

With Nova, for example, you can Play around with the type of transition between screens, the speed, effects when opening the app drawer, etc.It's a simple way to customize behavior without touching code, just from the settings.

However, many phones with their own custom interfaces, like Samsung, This customization is not offered as standard.Although the community has requested it, controls to modify these system animations are not always provided, and you depend on what the manufacturer decides to reveal or on using alternative launchers.

Transitions in video editing: Filmora and other programs

In the field of video editing, "transitions" are the effects that are applied between two clips: fades, wipes, slides, etc.Programs like Wondershare Filmora offer a good assortment of these effects and allow for considerable customization.

In Filmora you can, for example, Add a transition between two clips on the timeline and then adjust its duration.There are two main ways to do it:

• Right-click on the transition and select "Duration"A window opens where you enter the exact new duration and confirm.
• Drag one of the transition edges directly onto the timeline: this makes it visually longer or shorter.

The default duration is usually 2 secondsHowever, you can change that value globally in the program's preferences:

• Ir a Preferences → Editing tab.
• Find the "Transition duration" field and enter a new value.
• From then on, that will be the new standard duration for all transitions you add to the project.

Furthermore, each transition has additional properties which you can modify from the "Show properties" option. Among them is the transition modewhich determines how it is positioned between the clips:

• OverlapThe transition occupies part of the end of one clip and the beginning of the next, overlapping them.
• PrefixThe transition is located at the end of the first clip.
• SuffixThe transition is located at the beginning of the second clip.

By playing with these options you can fine-tune the feeling of fluidity and the rhythm of the editingwithout needing to manually enter keyframes for each change.

Automating transitions between compositions: from OBS to After Effects

One particularly interesting case is that of those who have been using OBS for live streams and are considering to reproduce that style of automatic scene changes in post-productionImagine you're setting up long interviews, with multiple cameras or video sources, and you want to:

• Display between 1 and 4 videos on screen per "page".
• Change the layout every so often.
• Avoid having to manually implement all changes in real time like you would in OBS.

In OBS you can quickly put something together and manually trigger changes, but that implies "Render" live while pressing buttonswhich isn't ideal if you want a more polished result for long interviews.

In After Effects (or other compositing programs) the idea would be chain together compositions or templates that automatically enter and exit, with predefined durationsAlthough the original content we handle does not include a step-by-step tutorial for After Effects, the general approach involves:

• Create master compositions with different layouts (1 large video, 4 in grid, etc.).
• Define transitions between those comps using adjustment layers, masks, or transition effects (fades, offsets, etc.).
• Setup fixed durations for each segment and, if necessary, use expressions or scripts to automate changing the visibility of one layer to another.

The goal is to achieve that "live performance" effect, but controlled, without depending on your real-time pulseOther programs, such as some advanced non-linear editors, also allow automating montages with programmed transitions, although the details vary from one tool to another.

In short, whether you work with real-time characters, Android interfaces, launchers, or video editors, Transition animations are much more than just decoration: They decide how fluid, responsive, and professional your project is perceived to be..

Knowing how to cancel a transition when a new action arises, how to use scenes and transitions in Android to animate design changes, how to circumvent framework limitations, or how to adjust modes and durations in tools like Filmora gives you fine control over the final result and saves you a lot of trial and error. Share the information so that other users know about the topic.