android:编写属性动画程序（旋转，缩放，淡出淡入）

activity_main.xml

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

MainActivity.java

package com.example.yanhsama.ex4_13;import android.support.v7.app.AppCompatActivity;import android.animation.ObjectAnimator;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ImageView;public class MainActivity extends AppCompatActivity {    Button rotateButton,alphaButton,scaleButton;    ImageView img;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        img = (ImageView)findViewById(R.id.imageView);        rotateButton = (Button)findViewById(R.id.button1);        alphaButton = (Button)findViewById(R.id.button2);        scaleButton = (Button)findViewById(R.id.button3);        rotateButton.setOnClickListener(new mClick());        alphaButton.setOnClickListener(new mClick());        scaleButton.setOnClickListener(new mClick());    }    public class mClick implements View.OnClickListener    {        @Override        public void onClick(View v) {            if(v == rotateButton) {                ObjectAnimator animator = ObjectAnimator.ofFloat(img, "rotation", 0.0F, 360.0F);                animator.setDuration(1000);                animator.start();            }            else if(v == alphaButton){                ObjectAnimator animator = ObjectAnimator.ofFloat(img, "alpha",1.0F, 0.0F, 1.0F);                animator.setDuration(3000);                animator.start();            }            else if(v == scaleButton){                ObjectAnimator animator = ObjectAnimator.ofFloat(img, "ScaleY", 1.0F, 0.5F, 1.0F);                animator.setDuration(5000);                animator.start();            }        }    }}

运行效果图示

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