一、概念

動(dòng)畫集合，子類：AnimationSet，標(biāo)簽：<set>
它可以包含若干個(gè)動(dòng)畫，并且它的內(nèi)部也可以嵌套其它動(dòng)畫集合。

二、實(shí)現(xiàn)

1. XML實(shí)現(xiàn)

//res/anim/set_animation.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="3000"
    android:fillAfter="true">
    <translate
        android:fromXDelta="0"
        android:fromYDelta="0"
        android:toXDelta="300"
        android:toYDelta="300"
        />
    <scale
        android:fromXScale="0"
        android:fromYScale="0"
        android:toXScale="1"
        android:toYScale="1"
        android:pivotX="0%"
        android:pivotY="0%"
        />
    <alpha
        android:fromAlpha="0.1"
        android:toAlpha="1" />
</set>

//布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="500px"
    android:layout_height="500px"
    android:layout_marginLeft="100px"
    android:background="@color/colorAccent">
    <TextView
        android:id="@+id/animate_tv"
        android:layout_width="wrap_content"
        android:layout_height="100px"
        android:gravity="center"
        android:textColor="@color/colorAccent"
        android:text="Hello Android!"
        android:background="@color/colorPrimaryDark"/>
</RelativeLayout>

//代碼，MainActivity
private void setAnimationXML() {
    Animation setAnimation = AnimationUtils.loadAnimation(this, R.anim.set_animation);
    mAnimate_tv.setAnimation(setAnimation);
    mAnimate_tv.startAnimation(setAnimation);
}

private void stopAnimation() {
    mAnimate_tv.clearAnimation();
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initView();
    setAnimationXML();
}

@Override
protected void onDestroy() {
    super.onDestroy();
    stopAnimation();
}

2. 代碼實(shí)現(xiàn)

//布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="500px"
    android:layout_height="500px"
    android:layout_marginLeft="100px"
    android:background="@color/colorAccent">
    <TextView
        android:id="@+id/animate_tv"
        android:layout_width="wrap_content"
        android:layout_height="100px"
        android:gravity="center"
        android:textColor="@color/colorAccent"
        android:text="Hello Android!"
        android:background="@color/colorPrimaryDark"/>
</RelativeLayout>

//代碼，MainActivity
private void setAnimationCode() {
    AnimationSet animationSet = new AnimationSet(true); //參數(shù)為true表示子動(dòng)畫共用一個(gè)插值器
    animationSet.addAnimation(new TranslateAnimation(0, 300, 0, 300));
    animationSet.addAnimation(new ScaleAnimation(0, 1.0f, 0, 1.0f, Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 0));
    animationSet.addAnimation(new AlphaAnimation(0.1f, 1f));

    animationSet.setDuration(3000);
    animationSet.setFillAfter(true);
    mAnimate_tv.setAnimation(animationSet);
    mAnimate_tv.startAnimation(animationSet);
}

private void stopAnimation() {
    mAnimate_tv.clearAnimation();
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initView();
    setAnimationCode();
}

@Override
protected void onDestroy() {
    super.onDestroy();
    stopAnimation();
}

三、屬性

android:interpolator：
表示動(dòng)畫集合所采用的插值器，插值器影響動(dòng)畫的速度。比如非勻速動(dòng)畫就需要通過插值器來控制動(dòng)畫的播放過程。這個(gè)屬性可以不指定，默認(rèn)為@android:anim/accelerate_decelerate_interpolator，即加速減速插值器。
android:shareInterpolator：
表示集合中的動(dòng)畫是否和集合共享同一個(gè)插值器。如果集合不指定插值器，那么子動(dòng)畫就需要單獨(dú)指定所需的插值器或者使用默認(rèn)插值器。