# AnimatorSet.Builder

Artifact: [androidx.core:core-animation](https://developer.android.com/jetpack/androidx/releases/core) [View Source](https://cs.android.com/search?q=file:androidx/core/animation/AnimatorSet.java+class:androidx.core.animation.AnimatorSet.Builder) Added in [1.0.0](https://developer.android.com/jetpack/androidx/releases/core#1.0.0)

*** ** * ** ***


```
public inner class AnimatorSet.Builder
```

<br />

*** ** * ** ***

The `Builder` object is a utility class to facilitate adding animations to a `AnimatorSet` along with the relationships between the various animations. The intention of the `Builder` methods, along with the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` method of `AnimatorSet` is to make it possible to express the dependency relationships of animations in a natural way. Developers can also use the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#playTogether(androidx.core.animation.Animator...)` and `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#playSequentially(androidx.core.animation.Animator...)` methods if these suit the need, but it might be easier in some situations to express the AnimatorSet of animations in pairs.

The `Builder` object cannot be constructed directly, but is rather constructed internally via a call to `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)`.

For example, this sets up a AnimatorSet to play anim1 and anim2 at the same time, anim3 to play when anim2 finishes, and anim4 to play when anim3 finishes:

```
    AnimatorSet s = new AnimatorSet();
    s.play(anim1).with(anim2);
    s.play(anim2).before(anim3);
    s.play(anim4).after(anim3);
```

Note in the example that both `https://developer.android.com/reference/androidx/core/animation/AnimatorSet.Builder#before(androidx.core.animation.Animator)` and `https://developer.android.com/reference/androidx/core/animation/AnimatorSet.Builder#after(androidx.core.animation.Animator)` are used. These are just different ways of expressing the same relationship and are provided to make it easier to say things in a way that is more natural, depending on the situation.

It is possible to make several calls into the same `Builder` object to express multiple relationships. However, note that it is only the animation passed into the initial `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` method that is the dependency in any of the successive calls to the `Builder` object. For example, the following code starts both anim2 and anim3 when anim1 ends; there is no direct dependency relationship between anim2 and anim3:

```
  AnimatorSet s = new AnimatorSet();
  s.play(anim1).before(anim2).before(anim3);
```
If the desired result is to play anim1 then anim2 then anim3, this code expresses the relationship correctly:

```
  AnimatorSet s = new AnimatorSet();
  s.play(anim1).before(anim2);
  s.play(anim2).before(anim3);
```

Note that it is possible to express relationships that cannot be resolved and will not result in sensible results. For example, `play(anim1).after(anim1)` makes no sense. In general, circular dependencies like this one (or more indirect ones where a depends on b, which depends on c, which depends on a) should be avoided. Only create AnimatorSets that can boil down to a simple, one-way relationship of animations starting with, before, and after other, different, animations.

## Summary

| ### Public methods |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/core/animation/AnimatorSet.Builder` | `https://developer.android.com/reference/androidx/core/animation/AnimatorSet.Builder#after(androidx.core.animation.Animator)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/core/animation/Animator anim)` Sets up the given animation to play when the animation supplied in the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` call that created this `Builder` object to start when the animation supplied in this method call ends. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/core/animation/AnimatorSet.Builder` | `https://developer.android.com/reference/androidx/core/animation/AnimatorSet.Builder#after(long)(long delay)` Sets up the animation supplied in the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` call that created this `Builder` object to play when the given amount of time elapses. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/core/animation/AnimatorSet.Builder` | `https://developer.android.com/reference/androidx/core/animation/AnimatorSet.Builder#before(androidx.core.animation.Animator)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/core/animation/Animator anim)` Sets up the given animation to play when the animation supplied in the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` call that created this `Builder` object ends. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/core/animation/AnimatorSet.Builder` | `https://developer.android.com/reference/androidx/core/animation/AnimatorSet.Builder#with(androidx.core.animation.Animator)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/core/animation/Animator anim)` Sets up the given animation to play at the same time as the animation supplied in the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` call that created this `Builder` object. |

## Public methods

### after

Added in [1.0.0](https://developer.android.com/jetpack/androidx/releases/core#1.0.0)

```
public @NonNull AnimatorSet.Builder after(@NonNull Animator anim)
```

Sets up the given animation to play when the animation supplied in the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` call that created this `Builder` object to start when the animation supplied in this method call ends.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/core/animation/Animator anim` | The animation whose end will cause the animation supplied to the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` method to play. |

### after

Added in [1.0.0](https://developer.android.com/jetpack/androidx/releases/core#1.0.0)

```
public @NonNull AnimatorSet.Builder after(long delay)
```

Sets up the animation supplied in the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` call that created this `Builder` object to play when the given amount of time elapses.

| Parameters |
|---|---|
| `long delay` | The number of milliseconds that should elapse before the animation starts. |

### before

Added in [1.0.0](https://developer.android.com/jetpack/androidx/releases/core#1.0.0)

```
public @NonNull AnimatorSet.Builder before(@NonNull Animator anim)
```

Sets up the given animation to play when the animation supplied in the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` call that created this `Builder` object ends.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/core/animation/Animator anim` | The animation that will play when the animation supplied to the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` method ends. |

### with

Added in [1.0.0](https://developer.android.com/jetpack/androidx/releases/core#1.0.0)

```
public @NonNull AnimatorSet.Builder with(@NonNull Animator anim)
```

Sets up the given animation to play at the same time as the animation supplied in the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` call that created this `Builder` object.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/core/animation/Animator anim` | The animation that will play when the animation supplied to the `https://developer.android.com/reference/androidx/core/animation/AnimatorSet#play(androidx.core.animation.Animator)` method starts. |