android 学习随笔二十六（动画：属性动画）

• 属性动画，属性动画是真正改变对象的某个属性的值

* 补间动画，只是一个动画效果，组件其实还在原来的位置上，xy没有改变
1、位移：
* 第一个参数target指定要显示动画的组件
* 第二个参数propertyName指定要改变组件的哪个属性
* 第三个参数values是可变参数，就是赋予属性的新的值
* 传入0，代表x起始坐标：当前x + 0
* 传入100，代表x终点坐标：当前x + 100

//具有get、set方法的成员变量就称为属性
ObjectAnimator oa = ObjectAnimator.ofFloat(bt, "translationX", 0, 100) ;

package com.itheima.propertyanimator;

import android.R.animator;

import android.os.Bundle;

import android.animation.Animator;

import android.animation.AnimatorInflater;

import android.animation.AnimatorSet;

import android.animation.ObjectAnimator;

import android.animation.ValueAnimator;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.animation.TranslateAnimation;

import android.widget.ImageView;

import android.widget.Toast;

public class MainActivity extends Activity {

    private ImageView iv;

    private ObjectAnimator oa1;

    private ObjectAnimator oa2;

    private ObjectAnimator oa3;

    private ObjectAnimator oa4;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        iv = (ImageView) findViewById(R.id.iv);

        iv.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                Toast.makeText(MainActivity.this, "点我上miss", 0).show();

            }

        });

    }

    public void translate(View v){

//        TranslateAnimation ta = new TranslateAnimation(-100, 100, 0, 0);

//        ta.setDuration(2000);

//        ta.setFillAfter(true);

//        iv.startAnimation(ta);

        //创建属性动画师

        //arg0:要操作的对象

        //arg1:要修改的属性的名字

        oa1 = ObjectAnimator.ofFloat(iv, "translationX", 0, 70, 30, 100);

        oa1.setDuration(2000);

        oa1.setRepeatCount(1);

        oa1.setRepeatMode(ValueAnimator.REVERSE);

        oa1.start();

    }

    public void scale(View v){

        oa2 = ObjectAnimator.ofFloat(iv, "scaleX", 0.2f, 2, 1, 2.5f);

        oa2.setDuration(2000);

        oa2.setRepeatCount(1);

        oa2.setRepeatMode(ValueAnimator.REVERSE);

        oa2.start();

    }

    public void alpha(View v){

        oa3 = ObjectAnimator.ofFloat(iv, "alpha", 0.2f, 1);

        oa3.setDuration(2000);

        oa3.setRepeatCount(1);

        oa3.setRepeatMode(ValueAnimator.REVERSE);

        oa3.start();

    }

    public void rotate(View v){

        oa4 = ObjectAnimator.ofFloat(iv, "rotation", 0, 360, 180, 720);

        oa4.setDuration(2000);

        oa4.setRepeatCount(1);

        oa4.setRepeatMode(ValueAnimator.REVERSE);

        oa4.start();

    }

    public void fly(View v){

        //创建动画师集合

        AnimatorSet set = new AnimatorSet();

        //排队飞

//        set.playSequentially(oa1, oa2, oa3, oa4);

        //一起飞

        set.playTogether(oa1, oa2, oa3, oa4);

        //设置属性动画师操作的对象

        set.setTarget(iv);

        set.start();

    }

    public void xml(View v){

        //使用动画师填充器把xml资源文件填充成属性动画对象

        Animator animator = AnimatorInflater.loadAnimator(this, R.animator.property_animation);

        animator.setTarget(iv);

        animator.start();

    }

}

MainActivity

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity" >

<LinearLayout

    android:id="@+id/ll"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:orientation="horizontal"

    >

    <Button android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="位移"

        android:onClick="translate"

        />

    <Button android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="缩放"

        android:onClick="scale"

        />

    <Button android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="透明"

        android:onClick="alpha"

        />

    <Button android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="旋转"

        android:onClick="rotate"

        />

    <Button android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="一起飞"

        android:onClick="fly"

        />

</LinearLayout>

<Button

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:text="播放xml定义的动画"

    android:onClick="xml"

    android:layout_below="@id/ll"

    />

    <ImageView

        android:id="@+id/iv"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/ic_launcher"

        android:layout_centerInParent="true"

        />

</RelativeLayout>

activity_main

animator\property_animation.xml

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

<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"

    android:propertyName="translationY"

    android:duration="2000"

    android:repeatCount="1"

    android:repeatMode="reverse"

    android:valueFrom="0"

    android:valueTo="100"

    >

</objectAnimator>

property_animation

2、缩放：
* 第三个参数指定缩放的比例
* 0.1是从原本高度的十分之一开始
* 2是到原本高度的2倍结束

ObjectAnimator oa = ObjectAnimator.ofFloat(bt, "scaleY", 0.1f, 2);
3、透明：
* 透明度，0是完全透明，1是完全不透明

ObjectAnimator oa = ObjectAnimator.ofFloat(bt, "alpha", 0.1f, 1);
4、旋转
* rotation指定是顺时针旋转
* 20是起始角度
* 270是结束角度

ObjectAnimator oa = ObjectAnimator.ofFloat(bt, "rotation", 20, 270);
* 属性指定为rotationX是竖直翻转
* 属性指定为rotationY是水平翻转

ObjectAnimator oa = ObjectAnimator.ofFloat(bt, "rotationY", 20, 180);

5、可变参数
* 第三个参数可变参数可以传入多个参数，可以实现往回位移（旋转、缩放、透明）

ObjectAnimator oa = ObjectAnimator.ofFloat(bt, "translationX", 0, 70, 30, 100) ;

6、所有动画一起飞

//创建动画师集合
AnimatorSet set = new AnimatorSet();
//设置要播放动画的组件
set.setTarget(bt);
//所有动画有先后顺序的播放
//set.playSequentially(oa, oa2, oa3, oa4);
//所有动画一起播放
set.playTogether(oa, oa2, oa3, oa4);
set.start();