ObjectAnimator（属性动画）

package com.example.animator;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private Button but;
    private ImageView img;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化控件
        but = (Button) findViewById(R.id.but);
        img = (ImageView) findViewById(R.id.img);

        //图片点击事件
        img.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Toast.makeText(MainActivity.this, "我在这里", Toast.LENGTH_SHORT).show();
            }
        });

        //演示属性动画
        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //创建平移动画
                ObjectAnimator translationX = ObjectAnimator.ofFloat(img,"translationX",0,300);
                //创建透明动画
                ObjectAnimator alpha = ObjectAnimator.ofFloat(img, "alpha", 1.0f, 0f);
                //动画集合
                AnimatorSet set = new AnimatorSet();
                //添加动画
                set.play(translationX).with(alpha);
                //动画耗时
                set.setDuration(5000);
                //开启
                set.start();

                //动画监听
                set.addListener(new AnimatorListenerAdapter() {
                    @Override//动画结束时
                    public void onAnimationEnd(Animator animation) {
                        super.onAnimationEnd(animation);
                    }

                    @Override
                    public void onAnimationRepeat(Animator animation) {
                        super.onAnimationRepeat(animation);
                    }

                    @Override//动画开始时
                    public void onAnimationStart(Animator animation) {
                        super.onAnimationStart(animation);
                    }
                });
            }
        });

    }

}

--------------------------------xml文件-----------------------------

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.animator.MainActivity">

   <Button
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="动画演示"
       android:id="@+id/but"/>
    <ImageView
        android:layout_marginTop="50dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/img"
        android:src="@mipmap/ic_launcher"/>




LinearLayout>