Android : 属性动画

先在res写一个animator文件夹
建立一个set文件

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:ordering="sequentially">

    <set android:ordering="together">
        <objectAnimator
            android:duration="2000"
            android:propertyName="translationX"
            android:valueFrom="0"
            android:valueTo="360"
            android:valueType="floatType"></objectAnimator>

        <objectAnimator
            android:duration="3000"
            android:propertyName="rotation"
            android:valueFrom="0"
            android:valueTo="720"
            android:valueType="floatType"></objectAnimator>

    </set>

    <set android:ordering="sequentially">
        <objectAnimator
            android:duration="1500"
            android:propertyName="alpha"
            android:valueFrom="0"
            android:valueTo="1"
            android:valueType="floatType"></objectAnimator>

        <objectAnimator
            android:duration="1500"
            android:propertyName="alpha"
            android:valueFrom="1"
            android:valueTo="0"
            android:valueType="floatType"></objectAnimator>

    </set>
</set>

xml布局文件

<?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=".MainActivity">

    <Button
        android:id="@+id/Start_Anim"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开始吧" />

    <Button
        android:id="@+id/Object_Anim"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ObjectAnimator开始吧" />

    <Button
        android:id="@+id/XML_Anim"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="XMl开始吧" />

</LinearLayout>

acativity里面的代码

package soexample.umeng.com.shuxingdonghua;

import android.animation.AnimatorInflater;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button Start_Anim;
    private Button Object_Anim;
    private Button XML_Anim;

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

    private void initView() {
        Start_Anim = (Button) findViewById(R.id.Start_Anim);
        Object_Anim = (Button) findViewById(R.id.Object_Anim);
        XML_Anim = (Button) findViewById(R.id.XML_Anim);

        Start_Anim.setOnClickListener(this);
        Object_Anim.setOnClickListener(this);
        XML_Anim.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.Start_Anim:
                valueAnimStart();
                Toast.makeText(this, "吕小帅", Toast.LENGTH_SHORT).show();
                break;
            case R.id.Object_Anim:
                //参数1：给某个对象设置动画，参数2：是什么动画呢
//                ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(Start_Anim, "alpha", 1f, 0f, 1f);
//                objectAnimator.setDuration(2000);
//                objectAnimator.start();

                // 步骤1：设置需要组合的动画效果
                ObjectAnimator translation = ObjectAnimator.ofFloat(Start_Anim, "translationX", 0, 300, 500);
                // 平移动画
                ObjectAnimator rotate = ObjectAnimator.ofFloat(Start_Anim, "rotation", 0f, 360f);
                // 旋转动画
                ObjectAnimator alpha = ObjectAnimator.ofFloat(Start_Anim, "alpha", 1f, 0f, 1f);
                // 透明度动画
                // 步骤2：创建组合动画的对象
                AnimatorSet animSet = new AnimatorSet();
                // 步骤3：根据需求组合动画
//                AnimatorSet.play(Animator anim)   ：播放当前动画
//                AnimatorSet.after(long delay)   ：将现有动画延迟x毫秒后执行
//                AnimatorSet.with(Animator anim)   ：将现有动画和传入的动画同时执行
//                AnimatorSet.after(Animator anim)   ：将现有动画插入到传入的动画之后执行
//                AnimatorSet.before(Animator anim) ：  将现有动画插入到传入的动画之前执行

                animSet.play(translation).with(rotate).before(alpha);
                animSet.setDuration(5000);
                // 步骤4：启动动画
                animSet.start();
                break;
            case R.id.XML_Anim:
                AnimatorSet set = (AnimatorSet) AnimatorInflater.loadAnimator(this, R.animator.set_animator);
                set.setTarget(Object_Anim);
                set.start();
                break;
        }
    }

    private void valueAnimStart() {
        //第一步创建对象 都是通过类名调用即可
        //ofFloat float...可变参数
        ValueAnimator valueAnimator = ValueAnimator.ofInt(Start_Anim.getLayoutParams().width, 500);
        valueAnimator.setDuration(3000);
        valueAnimator.setStartDelay(500);
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                //移动的单位  得值是跟你赋值对象的时候那个方法要一致
                int currentValue = (Integer) animation.getAnimatedValue();
                Start_Anim.getLayoutParams().width = currentValue;
                Log.e("currentValue", currentValue + "单位");
                //刷新自定义View的方法
//                invalidate();
//                postInvalidate()
                //RequestLayout 三个方法都会执行
                Start_Anim.requestLayout();
            }
        });
        valueAnimator.start();

    }
}

这就是一个简单动画,代码也很简单.