The document discusses different types of animations in Android programming, specifically focusing on property animation, drawable animation, and view animation. It covers the use of ValueAnimator and ObjectAnimator for animating values and properties, and explains how to choreograph multiple animations using AnimatorSet. Additionally, it details drawable animations created with AnimationDrawable and view animations, including tween and frame animations, specifying proper XML structuring for each type.

1. Android Programming
Lesson 13
Android Animation
NGUYEN The Linh

2. Android Programming
Contents
1 Property Animation
2 Drawable Animation
3 View Animation
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3. Android Programming
Android Animation
Property Animation
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4. Android Programming
Property Animation
 Animating with ValueAnimator
 The ValueAnimator class lets you animate values of some type
for the duration of an animation by specifying a set of int, float, or
color values to animate through. You obtain a ValueAnimator by
calling one of its factory methods: ofInt(), ofFloat(), or ofObject().
For example:
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5. Android Programming
Property Animation
 Animating with ValueAnimator
 The previous code snippets, however, has no real effect on an
object, because the ValueAnimator does not operate on objects
or properties directly.
 You do this by defining listeners in the ValueAnimator to
appropriately handle important events during the animation's
lifespan, such as frame updates.
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6. Android Programming
Property Animation
 Animating with ValueAnimator
 When implementing the listeners, you can obtain the calculated
value for that specific frame refresh by calling
getAnimatedValue()
 Animator.AnimatorListener
• onAnimationStart() - Called when the animation starts.
• onAnimationEnd() - Called when the animation ends.
• onAnimationRepeat() - Called when the animation repeats itself.
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7. Android Programming
Property Animation
 Animating with ValueAnimator
 Animator.AnimatorListener
• onAnimationCancel() - Called when the animation is canceled. A cancelled
animation also calls onAnimationEnd(), regardless of how they were ended.
 ValueAnimator.AnimatorUpdateListener
• onAnimationUpdate() - called on every frame of the animation.
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8. Android Programming
Property Animation
 Animating with ObjectAnimator
 The ObjectAnimator is a subclass of
he ValueAnimator (discussed in the previous section) and
combines the timing engine and value computation
of ValueAnimator with the ability to animate a named property of
a target object.
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9. Android Programming
Property Animation
 Choreographing Multiple Animations with AnimatorSet
 In many cases, you want to play an animation that depends on
when another animation starts or finishes.
 The Android system lets you bundle animations together into
an AnimatorSet, so that you can specify whether to start
animations simultaneously, sequentially, or after a specified delay.
 You can also nest AnimatorSet objects within each other.
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10. Android Programming
Property Animation
 Choreographing Multiple Animations with AnimatorSet
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11. Android Programming
Property Animation
 Choreographing Multiple Animations with AnimatorSet
 1. Plays bounceAnim.
 2. Plays squashAnim1, squashAnim2, stretchAnim1,
and stretchAnim2 at the same time.
 3. Plays bounceBackAnim.
 4. Plays fadeAnim.
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12. Android Programming
Property Animation
 Example 13.1
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13. Android Programming
Android Animation
Drawable Animation
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14. Android Programming
Drawable Animation
 Drawable animation lets you load a series of Drawable
resources one after another to create an animation.
 This is a traditional animation in the sense that it is created
with a sequence of different images, played in order, like a
roll of film
 The AnimationDrawable class is the basis for Drawable
animations.
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15. Android Programming
Drawable Animation
 While you can define the frames of an animation in your
code, using the AnimationDrawable class API, it's more
simply accomplished with a single XML file that lists the
frames that compose the animation.
 The XML file for this kind of animation belongs in
the res/drawable/ directory of your Android project.
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16. Android Programming
Drawable Animation
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17. Android Programming
Drawable Animation
 Example 13.2
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18. Android Programming
Android Animation
View Animation
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19. Android Programming
View Animation
 You can use the view animation system to perform tweened
animation on Views.
 Tween animation calculates the animation with information
such as the start point, end point, size, rotation, and
other common aspects of an animation.
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20. Android Programming
View Animation
 There are two types of animations that you can do with the
view animation framework:
 Tween animation: Creates an animation by performing a series of
transformations on a single image with an Animation
 Frame animation: or creates an animation by showing a
sequence of images in order with an AnimationDrawable.
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21. Android Programming
View Animation
 The animation XML file belongs in the res/anim/ directory
of your Android project.
 The file must have a single root element: this will be either a
single <alpha>, <scale>, <translate>, <rotate>,
interpolator element, or<set> element that holds groups of
these elements (which may include another <set>).
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22. Android Programming
View Animation
 Example 13.3
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23. Android Programming