android的Animation用法简介

                AnimationSet animationSet = new AnimationSet(false);

                AlphaAnimation alphaAnimation = new AlphaAnimation(1.0f, 0.1f);
                alphaAnimation.setDuration(3000);

                RotateAnimation rotateAnimation = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
                rotateAnimation.setDuration(3000);

                animationSet.addAnimation(alphaAnimation);
                animationSet.addAnimation(rotateAnimation);

                imageView.startAnimation(animationSet);

Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.alpha);
imageView.startAnimation(animation);

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha 
        android:fromAlpha="1"
        android:toAlpha="0.1"
        android:duration="3000"
        android:repeatCount="3"/>

    <rotate 
        android:startOffset="3000"
        android:fromDegrees="0"
        android:toDegrees="360"
        android:duration="3000"/>

</set>

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:drawable="@drawable/red" android:duration="200" />
    <item android:drawable="@drawable/yellow" android:duration="200" />
    <item android:drawable="@drawable/blue" android:duration="200" />
</animation-list>

imageView.setBackgroundResource(R.drawable.frame);
ad = (AnimationDrawable)imageView.getBackground();
ad.start();
//不要在onCreate中调用start，因为AnimationDrawable还没有完全跟Window相关联，如果想要界面显示时就开始动画的话，可以在onWindowFoucsChanged()中调用start()。