Android动画

##1. AlphaAnimation

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RelativeLayout rl_splash = (RelativeLayout) findViewById(R.id.rl_splash);
//播放动画效果
AlphaAnimation animation = new AlphaAnimation(1.0f, 0.0f);
//设置Alpha动画的持续时间
animation.setDuration(2000);
//播放Alpha动画
rl_splash.setAnimation(animation);

##2. RotateAnimation

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//相对于自身的哪个位置旋转，这里是相对于自身的右下角
RotateAnimation ra = new RotateAnimation(0, 360,  //从哪旋转，旋转多少度
        Animation.RELATIVE_TO_SELF, 1.0f, Animation.RELATIVE_TO_SELF,
        1.0f);
ra.setDuration(800);
ra.setRepeatCount(Animation.INFINITE);
ra.setRepeatMode(Animation.RESTART);
iv_scan.startAnimation(ra);

##3. ScaleAnimation(缩放动画)

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ScaleAnimation(float fromX, float toX, float fromY, float toY) 
Constructor to use when building a ScaleAnimation from code

##4. TranslateAnimation(位移动画)

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TranslateAnimation(int fromXType, float fromXValue, int toXType, float toXValue, int fromYType, float fromYValue, int toYType, float toYValue) 
Constructor to use when building a TranslateAnimation from code

##5. AnimationSet (多组动画)

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ScaleAnimation sa = new ScaleAnimation(0.2f, 1.0f, 0.4f,1.0f);//缩放的动画效果,1.0f就代表窗体的总宽或者高
sa.setDuration(400);
TranslateAnimation ta = new TranslateAnimation(//位移动的动画效果
          Animation.RELATIVE_TO_SELF, 0,//指定这个位置是相对于谁
          Animation.RELATIVE_TO_SELF, 0.1f,
          Animation.RELATIVE_TO_SELF, 0,
          Animation.RELATIVE_TO_SELF, 0);
ta.setDuration(300);
AnimationSet set = new AnimationSet(false);//如果想播放多种动画的组合，这里就要用到了AnimationSet
set.addAnimation(sa);
set.addAnimation(ta);
contentView.startAnimation(set); // 播放一组动画.

##6. Frame动画

- 在`drawable`目录下新建一个`xml`文件，内容如下:

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<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="true" > //onshot是指定是否循环播放
    <item
        android:drawable="@drawable/desktop_rocket_launch_1"  //Frame动画的图片
        android:duration="50"/> //播放这个图片持续的时间
    <item
        android:drawable="@drawable/desktop_rocket_launch_2"
        android:duration="100"/>
</animation-list>


- 播放Frame动画

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AnimationDrawable rocketAnimation;
public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      ImageView rocketImage = (ImageView) findViewById(R.id.iv);
      rocketImage.setBackgroundResource(R.drawable.animlist); //将上边建的Frame动画的xml文件通过背景资源设置给图片
      rocketAnimation = (AnimationDrawable) rocketImage.getBackground();  //获取到图片的背景资源
}
public void start(View view) {
      if (!rocketAnimation.isRunning()) {
           rocketAnimation.start();  //播放
      }
}

##7. 保持动画播放完成后的状态animation.setFillAfter(true);

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Interpolator //定义了动画的变化速度，可以实现匀速、正加速、负加速、无规则变加速度
AccelerateDecelerateInterpolator//先加速后减速。
AccelerateInterpolator//逐渐加速。    
LinearInterpolator//平稳不变的   
DecelerateInterpolator//逐渐减速
CycleInterpolator//曲线运动特效，要传递float型的参数。     
animation.setInterpolator(new LinearInterpolator());//指定动画的运行效果