属性动画实现透明，旋转，平移，缩放，集合动画

布局文件，设置透明，旋转，平移，缩放，集合动画的按钮，再设置一个属性动画的imageview

<?xml version="1.0" encoding="utf-8"?>

<ImageButton
android:id="@+id/img"
android:layout_width=“200dp”
android:layout_height=“200dp”
android:src="@drawable/aaa"//这里自己随意设置一张图片就好，用来做动画
android:layout_gravity=“center”
android:background="@null"/>

MainActvity中实现功能

package com.example.animator;

import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.Toast;

public class MainActivity extends Activity implements View.OnClickListener{

private Button btnAlpha;
private Button btnRotationy;
private Button btnScaleX;
private Button btnTranslationY;
private Button btnAnimatorSet;
private ImageButton img;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //初始化控件
    initView();
}

private void initView() {//找控件设置点击事件
    btnAlpha = findViewById(R.id.btn_alpha);
    btnRotationy = findViewById(R.id.btn_rotationY);
    btnScaleX = findViewById(R.id.btn_scaleX);
    btnTranslationY = findViewById(R.id.btn_translationY);
    btnAnimatorSet = findViewById(R.id.btn_AnimatorSet);
    img = findViewById(R.id.img);
    btnAlpha.setOnClickListener(this);
    btnRotationy.setOnClickListener(this);
    btnScaleX.setOnClickListener(this);
    btnTranslationY.setOnClickListener(this);
    btnAnimatorSet.setOnClickListener(this);
    img.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    switch (v.getId()){

//注意：以下实现属性动画的 ObjectAnimator.ofFloat中第二个参数都是跟自己要实现的动画名称一样，否则会出错。例如透明动画第二个参数就是它的英文单词alpha，不能写错；

        case R.id.btn_alpha://透明动画
            ObjectAnimator alpha = ObjectAnimator.ofFloat(img, "alpha", new float[]{0.0f, 0.2f, 0.4f, 0.6f, 0.8f, 1.0f});
            alpha.setDuration(2000);
            alpha.setRepeatCount(1);
            alpha.setRepeatMode(ObjectAnimator.RESTART);
            alpha.start();
            break;
        case R.id.btn_rotationY://旋转动画
            ObjectAnimator rotationY = ObjectAnimator.ofFloat(img, "rotationY", new float[]{90f, 180f, 270f, 360f});
            rotationY.setDuration(2000);
            rotationY.setRepeatCount(1);
            rotationY.setRepeatMode(ObjectAnimator.RESTART);
            rotationY.start();
            break;
        case R.id.btn_scaleX://缩放动画
            ObjectAnimator scaleX = ObjectAnimator.ofFloat(img, "scaleX", new float[]{1f, 2f, 3f, 4f, 5f, 6f, 1f});
            scaleX.setDuration(2000);
            scaleX.setRepeatCount(1);
            scaleX.setRepeatMode(ObjectAnimator.RESTART);
            scaleX.start();
            break;
        case R.id.btn_translationY://平移动画
            ObjectAnimator translationY = ObjectAnimator.ofFloat(img, "translationY", new float[]{10f, 20f, 30f, 40f, 60f,80f});
            translationY.setDuration(2000);
            translationY.setRepeatCount(1);
            translationY.setRepeatMode(ObjectAnimator.RESTART);
            translationY.start();
            break;
        case R.id.btn_AnimatorSet://集合动画
            AnimatorSet animatorSet = new AnimatorSet();
            ObjectAnimator oa = ObjectAnimator.ofFloat(img, "translationX", new float[]{10f, 20f, 30f, 40f, 60f, 80f});
            oa.setDuration(3000);
            ObjectAnimator oa2 = ObjectAnimator.ofFloat(img, "translationY", new float[]{-10f, -20f, -30f, -40f, -60f, -80f});
            oa2.setDuration(3000);
            animatorSet.playTogether(oa, oa2);
            animatorSet.start();
            break;
        case R.id.img://点击动画
            Toast.makeText(this, "你点击了我", Toast.LENGTH_SHORT).show();
            break;
    }
}

}