Android View动画、帧动画和属性动画 Android 动画（View动画,帧动画,属性动画）仔细讲解

splash = (RelativeLayout)findViewById(R.id.splash); 
//旋转动画 
RotateAnimation rotateAnimation = new RotateAnimation(0,360, 
        Animation.RELATIVE_TO_SELF,0.5f,Animation.RELATIVE_TO_SELF,0.5f); 
rotateAnimation.setDuration(2000); 
rotateAnimation.setFillAfter(true); 
//缩放动画 
ScaleAnimation scaleAnimation = new ScaleAnimation(0,1,0,1, 
        Animation.RELATIVE_TO_SELF,0.5f,Animation.RELATIVE_TO_SELF,0.5f); 
scaleAnimation.setDuration(2000); 
scaleAnimation.setFillAfter(true); 
//渐变动画 
AlphaAnimation alphaAnimation = new AlphaAnimation(0.2f,1.0f); 
alphaAnimation.setDuration(2000); 
alphaAnimation.setFillAfter(true); 
//平移动画 
TranslateAnimation translateAnimation = newTranslateAnimation (0,0,100,100); 
translateAnimation.setDuration(2000); 
translateAnimation.setFillAfter(true); 
//动画集合 
AnimationSet animationSet = new AnimationSet(true); 
animationSet.addAnimation(rotateAnimation); 
animationSet.addAnimation(scaleAnimation); 
animationSet.addAnimation(alphaAnimation); 
animationSet.addAnimation(translateAnimation); 
//启动动画 
plash.startAnimation(animationSet); 

//res/anim/anim/layout_anim.xml 
<layoutAnimation xmlns:android=” http://schemas.android.com/apk/res/android” 
android:delay=”0.1” //动画延迟时间为0.1*T，本例为100ms 
android:animationOrder=”normal” //子元素的播放动画顺序为顺序，也有reverse以及random 
android: animation=” @anim/layout_anim_item”/> 
 
//res/anim/anim/layout_anim_item.xml 
<?xml version=”1.0” encoding=”utf-8”?> 
<set xmlns:android=”http://schemas.android.com/apk/res/android” 
 animation:duration=”200” //每个子元素的动画周期T 
 animation:interpolator=”@android:anim/accelerate_ interpolator” //指定插值器 
animation:shareInterpolator=”true”> //表示所有子元素共享该插值器 
<alpha android:fromAlpha=”0.2” android: toAlpha =”1.0”/> 
<translate android:fromXDelta=”100” android: toXDelta =”0”/> 
</set> 

//res/anim/tran_in 
<?xml version="1.0" encoding="utf-8"?> 
<translate xmlns:android="http://schemas.android.com/apk/res/android" 
android:duration="500" 
//表示从屏幕100%的位置开始，因此tran_out当然是toXDelta="-100%p"，其他不变 
android:fromXDelta="100%p" 
android:fromYDelta="0" 
  android:toXDelta="0" 
  android:toYDelta="0" > 
</translate> 

//res/drawable/myanimation.xml 
<?xml version=”1.0” encoding=”utf-8”?> 
<animation-list xmlns:android=”http://schemas.android.com/apk/res/android” 
 animation:oneshot=”false” > //false为循环播放，true为类似于View动画的setFillAfter效果 
<item android: drawable =”@ drawable/ drawable 1” android:duration=” 200”> 
<item android: drawable =”@ drawable/ drawable 2” android:duration=” 200”> 
</animation-list> 
 
//在代码里加载动画设置并启动动画 
view.setBackgroundResource(R.drawable.myanimation.xml); 
(AnimationDrawable)view.getBackground.start(); 

view.setTranslationX(x);//3.0以后 
ViewHelper.setTranslationX(view,x);//3.0以前通过NineOldAndroid库实现 

ValueAnimator只定义和执行动画流程，并没有直接操作属性值的逻辑，需要添加动画更新的监听，并在onAnimationUpdate()中执行自定义的动画逻辑。
[java] view plain copy 在CODE上查看代码片派生到我的代码片
ValueAnimator animator = ValueAnimator.ofInt(1, 100); //定义动画，相当于1秒内数100个数 
animator.addUpdateListener(new AnimatorUpdateListener() { 
  @Override 
  public void onAnimationUpdate(ValueAnimator animation){ 
    float fraction = animation.getAnimatedFraction();//动画进度值0-1 
    //整型估值器帮我们计算了start+(end-strat)*fraction，并设置给控件的宽度 
    view.getLayoutParams().width = new IntEvaluator().evaluate(fraction,start,end) //不需要set方法 
    view.requestLayout(); 
  } 
}); 
animator.setDuration(1000).start(); 

//x轴方向缩放的例子 
ObjectAnimator animator = ObjectAnimator.ofFloat(view,”scaleX”,2.0f); 
animator.setDuration(1000); 
animator.setStartDelay(1000); 
animator.start(); 

ViewWrapper wrapper = new ViewWrapper(view); 
ObjectAnimator.ofInt(view,”width”,200).setDuration(1000).start(); 
 private static class ViewWrapper{ 
  private View myView; 
 public ViewWrapper(View view){ 
  myView = view; 
 } 
 public int getWidth(){ 
  return myView.getLayoutParams().width; 
 } 
 public int setWidth(int width){ 
 myView.getLayoutParams().width = width; 
 myView.requestLayout(); 
 } 
} 

//x轴方向缩放的例子，效果同3.3 
ViewPropertyAnimation.animate(view).scaleX(2.0f).setDuration(1000) 
.setInterpolator(new OvershootInterpolator()) 
.setStartDelay(1000).start(); 

ObjectAnimator objectAnimator1= ObjectAnimator.ofFloat(view, "alpha", 1.0f, 0f);  
ObjectAnimator objectAnimator2= ObjectAnimator.ofFloat(view, "translationY", 0f, 30f);  
ObjectAnimator objectAnimator3= ObjectAnimator.ofFloat(view, "translationX", 0f, 30f);  
AnimatorSet animatorSet = new AnimatorSet();  
animatorSet.setDuration(5000);  
animatorSet.setInterpolator(new LinearInterpolator());   
// animatorSet.playTogether(objectAnimator1, objectAnimator2. objectAnimator3); //三个动画同时执行  
// 12同时执行，3接着执行  
animatorSet.play(objectAnimator1).with(objectAnimator2);  
animatorSet.play(objectAnimator3).after(objectAnimator2);  
animatorSet.start(); 

public class AccelerateDecelerateInterpolator extends BaseInterpolator 
    implements NativeInterpolatorFactory { 
  ...... 
  public float getInterpolation(float input) { 
    return (float)(Math.cos((input + 1) * Math.PI) / 2.0f) + 0.5f; 
  } 
  ...... 
} 

//监听动画完成 
animationSet.setAnimationListener(new Animation.AnimationListener() { 
  @Override 
  public void onAnimationStart(Animation animation) {} 
  @Override 
  public void onAnimationEnd(Animation animation) {} 
  @Override 
public void onAnimationRepeat(Animation animation) {} 
@Override 
  public void onAnimationCancel(Animation animation) {} 
});