Anim中实现Scale和Alpha操作ImageView

针对这个动画效果的应用,可以了解如下几个知识点:
1.几种动画结合应用到一个ImageView上;
2.将Drawable中的id标识图片转化为Drawable对象
3.xml呈现上述1中功能点;

1.Java代码 
ScaleAnimation myAnimation_Scale;  
AlphaAnimation myAnimation_Alpha;  
          
myAnimation_Alpha = new AlphaAnimation(1f, 0.5f);  
myAnimation_Alpha.setAnimationListener(listener);  
myAnimation_Alpha.setDuration(1000);  
 
myAnimation_Scale = new ScaleAnimation(0.1f, 1.0f, 0.1f, 1f,  
    Animation.RELATIVE_TO_SELF, 2, Animation.RELATIVE_TO_SELF, 2);  
myAnimation_Scale.setAnimationListener(listener);  
myAnimation_Scale.setDuration(1000);  
myAnimation_Scale.setInterpolator(new AccelerateInterpolator());  
 
AnimationSet aa = new AnimationSet(true);  
         aa.addAnimation(myAnimation_Alpha);  
         aa.addAnimation(myAnimation_Scale);  
        // aa.setDuration(1000);  
 
// animation = AnimationUtils.loadAnimation(this, R.anim.alpha_scale);  
scaleImage.startAnimation(aa); 

ScaleAnimation myAnimation_Scale;
AlphaAnimation myAnimation_Alpha;

myAnimation_Alpha = new AlphaAnimation(1f, 0.5f);
myAnimation_Alpha.setAnimationListener(listener);
myAnimation_Alpha.setDuration(1000);

myAnimation_Scale = new ScaleAnimation(0.1f, 1.0f, 0.1f, 1f,
Animation.RELATIVE_TO_SELF, 2, Animation.RELATIVE_TO_SELF, 2);
myAnimation_Scale.setAnimationListener(listener);
myAnimation_Scale.setDuration(1000);
myAnimation_Scale.setInterpolator(new AccelerateInterpolator());

AnimationSet aa = new AnimationSet(true);
     aa.addAnimation(myAnimation_Alpha);
     aa.addAnimation(myAnimation_Scale);
// aa.setDuration(1000);

// animation = AnimationUtils.loadAnimation(this, R.anim.alpha_scale);
scaleImage.startAnimation(aa);


2.Java代码 
Drawable ico = getResources().getDrawable(R.drawable.home);  
ImageView scaleImage.setBackgroundDrawable(ico);  
     ico.mutate().setAlpha(80); 

Drawable ico = getResources().getDrawable(R.drawable.home);
ImageView scaleImage.setBackgroundDrawable(ico);
ico.mutate().setAlpha(80);


3.alpha_scale.xml文件:
Java代码 
<?xml version="1.0" encoding="utf-8"?>  
<set xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shareInterpolator="false">  
    <alpha android:interpolator="@android:res/anim/accelerate_decelerate_interpolator" 
        android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="500" 
        android:repeatCount="0">  
    </alpha>  
    <scale android:interpolator="@android:res/anim/accelerate_decelerate_interpolator" 
        android:fromXScale="1.0" android:toXScale="5.0" android:fromYScale="1.0" 
        android:toYScale="5.0" android:pivotX="50%" android:pivotY="50%" 
        android:duration="2000" android:repeatCount="0" android:startOffset="500"></scale>  
</set>