android animator 动画

animator 动画
动画的作用是让UI有动感，看上去时尚。

Android中动画分两种方式：

一种方式是补间动画Tween Animation，就是说你定义一个开始和结束，中间的部分由程序运算得到。
另一种叫逐帧动画Frame Animation，就是说一帧一帧的连起来播放就变成了动画。

动画可以实现的效果：
1. 移动(Translation)
2. 透明度(alpha)
3. 旋转（rotate）
4. 缩放 (scale)

现在分别用例子来讲解：以下的实现都是用代码实现的(ObjectAnimator)

1. 移动(Translation)

    主要代码[java]
AnimatorSet set = new AnimatorSet() ;
        ObjectAnimator anim = ObjectAnimator .ofFloat(phone, "translationX", -500f, 0f);
        anim.setDuration(2000);
        ObjectAnimator anim3 = ObjectAnimator .ofFloat(phone, "translationX", 0f, -500f);
        anim3.setDuration(2000);
        ObjectAnimator anim2 = ObjectAnimator .ofFloat(phone, "translationY", 0f, -500f);
        anim2.setDuration(2000);
        ObjectAnimator anim4 = ObjectAnimator .ofFloat(phone, "translationY", -500f, 0f);
        anim4.setDuration(2000);


        AnimatorSet set3 = new AnimatorSet();
        set3.play(anim4).before(anim3) ;
        AnimatorSet set2 = new AnimatorSet();
        set2.play(anim2).before(set3) ;
        set.play(anim).before(set2);
        set.start();

AnimatorSet set = new AnimatorSet() ;
  ObjectAnimator anim = ObjectAnimator .ofFloat(phone, "translationX", -500f, 0f);
  anim.setDuration(2000);
  ObjectAnimator anim3 = ObjectAnimator .ofFloat(phone, "translationX", 0f, -500f);
  anim3.setDuration(2000);
  ObjectAnimator anim2 = ObjectAnimator .ofFloat(phone, "translationY", 0f, -500f);
  anim2.setDuration(2000);
  ObjectAnimator anim4 = ObjectAnimator .ofFloat(phone, "translationY", -500f, 0f);
  anim4.setDuration(2000);


  AnimatorSet set3 = new AnimatorSet();
  set3.play(anim4).before(anim3) ;
  AnimatorSet set2 = new AnimatorSet();
  set2.play(anim2).before(set3) ;
  set.play(anim).before(set2);
  set.start();

讲解：anim 是从-500f 位置移动到当前位置（X轴）；
    anim3是从当前位置移动到-500f的位置（X轴）；
    anim2是从当前位置移动-500f的位置(Y轴)；
    anim 4是从-500f 位置移动到当前位置（Y轴）；

   [java]
AnimatorSet set3 = new AnimatorSet();
        set3.play(anim4).before(anim3) ;
        AnimatorSet set2 = new AnimatorSet();
        set2.play(anim2).before(set3) ;
        set.play(anim).before(set2);
        set.start();

AnimatorSet set3 = new AnimatorSet();
  set3.play(anim4).before(anim3) ;
  AnimatorSet set2 = new AnimatorSet();
  set2.play(anim2).before(set3) ;
  set.play(anim).before(set2);
  set.start();         这样做的目的是为了，让目标view移动一个来回，从哪里出发，最后回到出发的位置。

2. 透明度(alpha)

主要代码
[java]
AnimatorSet set = new AnimatorSet() ;
        ObjectAnimator anim = ObjectAnimator.ofFloat(phone, "alpha", 1f, 0f);
        anim.setDuration(2000);
        ObjectAnimator anim2 = ObjectAnimator.ofFloat(phone, "alpha", 0f, 1f);
        anim2.setDuration(2000);
        set.play(anim).before(anim2) ;
        set.start();

AnimatorSet set = new AnimatorSet() ;
  ObjectAnimator anim = ObjectAnimator.ofFloat(phone, "alpha", 1f, 0f);
  anim.setDuration(2000);
  ObjectAnimator anim2 = ObjectAnimator.ofFloat(phone, "alpha", 0f, 1f);
  anim2.setDuration(2000);
  set.play(anim).before(anim2) ;
  set.start();
讲解： anim 从可见到不可见；

anim 从不可见到可见；
3. 旋转（rotate）
主要代码

[java]
nimatorSet set = new AnimatorSet() ;
        ObjectAnimator anim = ObjectAnimator .ofFloat(phone, "rotationX", 0f, 180f);
        anim.setDuration(2000);
        ObjectAnimator anim2 = ObjectAnimator .ofFloat(phone, "rotationX", 180f, 0f);
        anim2.setDuration(2000);
        ObjectAnimator anim3 = ObjectAnimator .ofFloat(phone, "rotationY", 0f, 180f);
        anim3.setDuration(2000);
        ObjectAnimator anim4 = ObjectAnimator .ofFloat(phone, "rotationY", 180f, 0f);
        anim4.setDuration(2000);

        set.play(anim).before(anim2);
        set.play(anim3).before(anim4) ;
        set.start();

AnimatorSet set = new AnimatorSet() ;
  ObjectAnimator anim = ObjectAnimator .ofFloat(phone, "rotationX", 0f, 180f);
  anim.setDuration(2000);
  ObjectAnimator anim2 = ObjectAnimator .ofFloat(phone, "rotationX", 180f, 0f);
  anim2.setDuration(2000);
  ObjectAnimator anim3 = ObjectAnimator .ofFloat(phone, "rotationY", 0f, 180f);
  anim3.setDuration(2000);
  ObjectAnimator anim4 = ObjectAnimator .ofFloat(phone, "rotationY", 180f, 0f);
  anim4.setDuration(2000);

  set.play(anim).before(anim2);
  set.play(anim3).before(anim4) ;
  set.start();

讲解：anim 从0度转180度(X轴)

&nb

补充：移动开发 , Android ,