动画 -- 属性动画 -- AnimatorSet

一、概念

AnimatorSet，标签：<set>
属性动画集合。

二、实现

1. XML实现

//res/animator/set_animator.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:ordering="together">
    <objectAnimator
        android:propertyName="alpha"
        android:duration="3000"
        android:valueFrom="0"
        android:valueTo="1"
        android:valueType="floatType"
        />
    <objectAnimator
        android:propertyName="translationX"
        android:duration="3000"
        android:valueFrom="0"
        android:valueTo="200"
        android:valueType="floatType"
        />
    <objectAnimator
        android:propertyName="translationY"
        android:duration="3000"
        android:valueFrom="0"
        android:valueTo="200"
        android:valueType="floatType"
        />
</set>

//布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/main_tv"
        android:layout_width="wrap_content"
        android:layout_height="100px"
        android:layout_centerInParent="true"
        android:gravity="center"
        android:textColor="#FFFFFF"
        android:text="Hello Android!"
        android:background="@color/colorPrimary"/>
</RelativeLayout>

//代码，MainActivity
private void setAnimatorXML() {
    mAnimatorSet = (AnimatorSet)AnimatorInflater.loadAnimator(this, R.animator.set_animator);
    mAnimatorSet.setTarget(mMain_tv);
    mAnimatorSet.start();
}

private void stopAnimator() {
    mAnimatorSet.cancel();
}

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

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

2. 代码实现

//布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/main_tv"
        android:layout_width="wrap_content"
        android:layout_height="100px"
        android:layout_centerInParent="true"
        android:gravity="center"
        android:textColor="#FFFFFF"
        android:text="Hello Android!"
        android:background="@color/colorPrimary"/>
</RelativeLayout>

//代码，MainActivity
private void setAnimatorCode() {
    ObjectAnimator animator1 = ObjectAnimator.ofFloat(mMain_tv, "alpha", 0, 1);
    ObjectAnimator animator2 = ObjectAnimator.ofFloat(mMain_tv, "translationX", 0, 200);
    ObjectAnimator animator3 = ObjectAnimator.ofFloat(mMain_tv, "translationY", 0, 200);

    AnimatorSet animatorSet = new AnimatorSet();
    animatorSet.playTogether(animator1, animator2, animator3);
    animatorSet.setDuration(3000);
    animatorSet.start();
}

private void stopAnimator() {
    mAnimatorSet.cancel();
}

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

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

三、属性

android:ordering：
表示动画集合中的子动画播放顺序。有"together"和"sequentially"两个选项，默认值为"together"。
其中"together"表示动画集合中的子动画同时播放，"sequentially"表示动画集合中的子动画按照前后顺序依次播放。

四、实例

动画实战：打造炫酷的加载动画
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