[Android] Android Animation


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1. Property Animation
1.1 Animating with ValueAnimator
1.2 Animating with ObjectAnimator
1.3 Choreographing Multiple Animations with AnimatorSet
2. Drawable Animation
3. View Animation

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[Android] Android Animation

  1. 1. Android Programming Lesson 13Android Animation NGUYEN The Linh
  2. 2. Android ProgrammingContents 1 Property Animation 2 Drawable Animation 3 View Animation 2
  3. 3. Android ProgrammingAndroid Animation Property Animation 3
  4. 4. Android ProgrammingProperty 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: 4
  5. 5. Android ProgrammingProperty 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 animations lifespan, such as frame updates. 5
  6. 6. Android ProgrammingProperty 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. 6
  7. 7. Android ProgrammingProperty 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. 7
  8. 8. Android ProgrammingProperty 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. 8
  9. 9. Android ProgrammingProperty 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. 9
  10. 10. Android ProgrammingProperty Animation Choreographing Multiple Animations with AnimatorSet 10
  11. 11. Android ProgrammingProperty 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. 11
  12. 12. Android ProgrammingProperty Animation Example 13.1 12
  13. 13. Android ProgrammingAndroid Animation Drawable Animation 13
  14. 14. Android ProgrammingDrawable 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. 14
  15. 15. Android ProgrammingDrawable Animation While you can define the frames of an animation in your code, using the AnimationDrawable class API, its 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. 15
  16. 16. Android ProgrammingDrawable Animation 16
  17. 17. Android ProgrammingDrawable Animation Example 13.2 17
  18. 18. Android ProgrammingAndroid Animation View Animation 18
  19. 19. Android ProgrammingView 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. 19
  20. 20. Android ProgrammingView 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. 20
  21. 21. Android ProgrammingView 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>). 21
  22. 22. Android ProgrammingView Animation Example 13.3 22
  23. 23. Android Programming