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# LayoutAnimationController

`public class LayoutAnimationController`
`extends Object` ``

java.lang.Object
↳ | android.view.animation.LayoutAnimationController

Known direct subclasses GridLayoutAnimationController
GridLayoutAnimationController | A layout animation controller is used to animated a grid layout's children.

A layout animation controller is used to animated a layout's, or a view group's, children. Each child uses the same animation but for every one of them, the animation starts at a different time. A layout animation controller is used by `ViewGroup` to compute the delay by which each child's animation start must be offset. The delay is computed by using characteristics of each child, like its index in the view group. This standard implementation computes the delay by multiplying a fixed amount of miliseconds by the index of the child in its parent view group. Subclasses are supposed to override `getDelayForView(android.view.View)` to implement a different way of computing the delay. For instance, a `GridLayoutAnimationController` will compute the delay based on the column and row indices of the child in its parent view group. Information used to compute the animation delay of each child are stored in an instance of `LayoutAnimationController.AnimationParameters`, itself stored in the `ViewGroup.LayoutParams` of the view.

## Summary

### Nested classes
`class` | `LayoutAnimationController.AnimationParameters` The set of parameters that has to be attached to each view contained in the view group animated by the layout animation controller.

### XML attributes
`android:animation` | Animation to use on each child.
`android:animationOrder` | The order in which the animations will be started.
`android:delay` | Fraction of the animation duration used to delay the beginning of the animation of each child.
`android:interpolator` | Interpolator used to interpolate the delay between the start of each animation.

### Constants
`int` | `ORDER_NORMAL` Distributes the animation delays in the order in which view were added to their view group.
`int` | `ORDER_RANDOM` Randomly distributes the animation delays.
`int` | `ORDER_REVERSE` Distributes the animation delays in the reverse order in which view were added to their view group.

### Fields
`protected Animation` | `mAnimation` The animation applied on each child of the view group on which this layout animation controller is set.
`protected Interpolator` | `mInterpolator` The interpolator used to interpolate the delays.
`protected Random` | `mRandomizer` The randomizer used when the order is set to random.

### Public constructors
`LayoutAnimationController(Context context, AttributeSet attrs)` Creates a new layout animation controller from external resources.
`LayoutAnimationController(Animation animation)` Creates a new layout animation controller with a delay of 50% and the specified animation.
`LayoutAnimationController(Animation animation, float delay)` Creates a new layout animation controller with the specified delay and the specified animation.

### Public methods
`Animation` | `getAnimation()` Returns the animation applied to each child of the view group on which this controller is set.
`final Animation` | `getAnimationForView(View view)` Returns the animation to be applied to the specified view.
`float` | `getDelay()` Returns the delay by which the children's animation are offset.
`Interpolator` | `getInterpolator()` Returns the interpolator used to interpolate the delays between the children.
`int` | `getOrder()` Returns the order used to compute the delay of each child's animation.
`boolean` | `isDone()` Indicates whether the layout animation is over or not.
`void` | `setAnimation(Animation animation)` Sets the animation to be run on each child of the view group on which this layout animation controller is .
`void` | `setAnimation(Context context, int resourceID)` Sets the animation to be run on each child of the view group on which this layout animation controller is .
`void` | `setDelay(float delay)` Sets the delay, as a fraction of the animation duration, by which the children's animations are offset.
`void` | `setInterpolator(Context context, int resourceID)` Sets the interpolator used to interpolate the delays between the children.
`void` | `setInterpolator(Interpolator interpolator)` Sets the interpolator used to interpolate the delays between the children.
`void` | `setOrder(int order)` Sets the order used to compute the delay of each child's animation.
`void` | `start()` Starts the animation.
`boolean` | `willOverlap()` Indicates whether two children's animations will overlap.

### Protected methods
`long` | `getDelayForView(View view)` Returns the amount of milliseconds by which the specified view's animation must be delayed or offset.
`int` | `getTransformedIndex(LayoutAnimationController.AnimationParameters params)` Transforms the index stored in `LayoutAnimationController.AnimationParameters` by the order returned by `getOrder()`.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## XML attributes

### android:animation

Animation to use on each child.

May be a reference to another resource, in the form "`@[+][package:]type/name`" or a theme attribute in the form "`?[package:]type/name`".

Related methods:

- `setAnimation(Context,int)`

### android:animationOrder

The order in which the animations will be started.

Must be one of the following constant values.

Constant | Value | Description
--- | --- | ---
normal | 0 | Animations are started in the natural order.
random | 2 | Animations are started randomly.
reverse | 1 | Animations are started in the reverse order.

Related methods:

- `setOrder(int)`

### android:delay

Fraction of the animation duration used to delay the beginning of the animation of each child.

May be a floating point value, such as "`1.2`".

May be a fractional value, which is a floating point number appended with either % or %p, such as "`14.5%`". The % suffix always means a percentage of the base size; the optional %p suffix provides a size relative to some parent container.

### android:interpolator

Interpolator used to interpolate the delay between the start of each animation.

May be a reference to another resource, in the form "`@[+][package:]type/name`" or a theme attribute in the form "`?[package:]type/name`".

Related methods:

- `setInterpolator(Interpolator)`

## Constants

### ORDER_NORMAL

    public static final int ORDER_NORMAL

Distributes the animation delays in the order in which view were added to their view group.

Constant Value: 0 (0x00000000)

### ORDER_RANDOM

    public static final int ORDER_RANDOM

Randomly distributes the animation delays.

Constant Value: 2 (0x00000002)

### ORDER_REVERSE

    public static final int ORDER_REVERSE

Distributes the animation delays in the reverse order in which view were added to their view group.

Constant Value: 1 (0x00000001)

## Fields

### mAnimation

    protected Animation mAnimation

The animation applied on each child of the view group on which this layout animation controller is set.

### mInterpolator

    protected Interpolator mInterpolator

The interpolator used to interpolate the delays.

### mRandomizer

    protected Random mRandomizer

The randomizer used when the order is set to random. Subclasses should use this object to avoid creating their own.

## Public constructors

### LayoutAnimationController

    public LayoutAnimationController (Context context,
                    AttributeSet attrs)

Creates a new layout animation controller from external resources.

Parameters
`context` | `Context`: the Context the view group is running in, through which it can access the resources
`attrs` | `AttributeSet`: the attributes of the XML tag that is inflating the layout animation controller

### LayoutAnimationController

    public LayoutAnimationController (Animation animation)

Creates a new layout animation controller with a delay of 50% and the specified animation.

Parameters
`animation` | `Animation`: the animation to use on each child of the view group

### LayoutAnimationController

    public LayoutAnimationController (Animation animation,
                    float delay)

Creates a new layout animation controller with the specified delay and the specified animation.

Parameters
`animation` | `Animation`: the animation to use on each child of the view group
`delay` | `float`: the delay by which each child's animation must be offset

## Public methods

### getAnimation

    public Animation getAnimation ()

Returns the animation applied to each child of the view group on which this controller is set.

Returns
`Animation` | an `Animation` instance

See also:

- `setAnimation(android.content.Context, int)`
- `setAnimation(Animation)`

### getAnimationForView

    public final Animation getAnimationForView (View view)

Returns the animation to be applied to the specified view. The returned animation is delayed by an offset computed according to the information provided by `LayoutAnimationController.AnimationParameters`. This method is called by view groups to obtain the animation to set on a specific child.

Parameters
`view` | `View`: the view to animate

Returns
`Animation` | an animation delayed by the number of milliseconds returned by `getDelayForView(android.view.View)`

See also:

- `getDelay()`
- `setDelay(float)`
- `getDelayForView(android.view.View)`

### getDelay

    public float getDelay ()

Returns the delay by which the children's animation are offset. The delay is expressed as a fraction of the animation duration.

Returns
`float` | a fraction of the animation duration

See also:

- `setDelay(float)`

### getInterpolator

    public Interpolator getInterpolator ()

Returns the interpolator used to interpolate the delays between the children.

Returns
`Interpolator` | an `Interpolator`

### getOrder

    public int getOrder ()

Returns the order used to compute the delay of each child's animation.

Related XML Attributes:

- android:animationOrder

Returns
`int` | one of `ORDER_NORMAL`, `ORDER_REVERSE` or `ORDER_RANDOM`

### isDone

    public boolean isDone ()

Indicates whether the layout animation is over or not. A layout animation is considered done when the animation with the longest delay is done.

Returns
`boolean` | true if all of the children's animations are over, false otherwise

### setAnimation

    public void setAnimation (Animation animation)

Sets the animation to be run on each child of the view group on which this layout animation controller is .

Related XML Attributes:

- android:animation

Parameters
`animation` | `Animation`: the animation to run on each child of the view group

See also:

- `setAnimation(android.content.Context, int)`
- `getAnimation()`

### setAnimation

    public void setAnimation (Context context,
                    int resourceID)

Sets the animation to be run on each child of the view group on which this layout animation controller is .

Related XML Attributes:

- android:animation

Parameters
`context` | `Context`: the context from which the animation must be inflated
`resourceID` | `int`: the resource identifier of the animation

See also:

- `setAnimation(Animation)`
- `getAnimation()`

### setDelay

    public void setDelay (float delay)

Sets the delay, as a fraction of the animation duration, by which the children's animations are offset. The general formula is:

     child animation delay = child index * delay * animation duration

Parameters
`delay` | `float`: a fraction of the animation duration

See also:

- `getDelay()`

### setInterpolator

    public void setInterpolator (Context context,
                    int resourceID)

Sets the interpolator used to interpolate the delays between the children.

Related XML Attributes:

- android:interpolator

Parameters
`context` | `Context`: the context from which the interpolator must be inflated
`resourceID` | `int`: the resource identifier of the interpolator

See also:

- `getInterpolator()`
- `setInterpolator(Interpolator)`

### setInterpolator

    public void setInterpolator (Interpolator interpolator)

Sets the interpolator used to interpolate the delays between the children.

Related XML Attributes:

- android:interpolator

Parameters
`interpolator` | `Interpolator`: the interpolator

See also:

- `getInterpolator()`
- `setInterpolator(Interpolator)`

### setOrder

    public void setOrder (int order)

Sets the order used to compute the delay of each child's animation.

Related XML Attributes:

- android:animationOrder

Parameters
`order` | `int`: one of `ORDER_NORMAL`, `ORDER_REVERSE` or `ORDER_RANDOM`

### start

    public void start ()

Starts the animation.

### willOverlap

    public boolean willOverlap ()

Indicates whether two children's animations will overlap. Animations overlap when the delay is lower than 100% (or 1.0).

Returns
`boolean` | true if animations will overlap, false otherwise

## Protected methods

### getDelayForView

    protected long getDelayForView (View view)

Returns the amount of milliseconds by which the specified view's animation must be delayed or offset. Subclasses should override this method to return a suitable value. This implementation returns `child animation delay` milliseconds where:

     child animation delay = child index * delay

The index is retrieved from the `LayoutAnimationController.AnimationParameters` found in the view's `ViewGroup.LayoutParams`.

Parameters
`view` | `View`: the view for which to obtain the animation's delay

Returns
`long` | a delay in milliseconds

See also:

- `getAnimationForView(android.view.View)`
- `getDelay()`
- `getTransformedIndex(android.view.animation.LayoutAnimationController.AnimationParameters)`
- `ViewGroup.LayoutParams`

### getTransformedIndex

    protected int getTransformedIndex (LayoutAnimationController.AnimationParameters params)

Transforms the index stored in `LayoutAnimationController.AnimationParameters` by the order returned by `getOrder()`. Subclasses should override this method to provide additional support for other types of ordering. This method should be invoked by `getDelayForView(android.view.View)` prior to any computation.

Parameters
`params` | `LayoutAnimationController.AnimationParameters`: the animation parameters containing the index

Returns
`int` | a transformed index

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