Animation

Posted 2020-10-08 Holyday

Animation是android给我们提供的一个可以实现动画效果的API,利用Animation我们可以实现一系列的动画效果,比如缩放动画,透明度动画,旋转动画,位移动画,布局动画,帧动画等等.Android基础动画分为四种,分别是Tween Animation,Frame Animation,Layout Animation,Property Animation.由于动画效果不好用图片进行展示,大家可以自己亲手试试看下效果.下面给出前三种简单的示例代码,帮助大家进行简单的动画入门.

(1) Tween Animation (变换动画)

　　Tween Animation按效果可以分为四种:Alpha,Scale,Translate,Rotate,它们有一下共同属性:

　　1. Duration: 动画持续时间(毫秒);

　　2. fillAfter: 设置为True,动画转换在动画结束后被应用;

　　3. fillBefore: 设置为True,动画转换在动画开始前被应用;

　　4. interpolator: 动画插入器(加速,减速插入器);

　　5. repeatCount: 动画重复次数;

　　6. repeatMode: 正序重复/倒序重复

　　7. startOffSet: 动画之间的时间间隔

 

　　① Alpha (渐变透明度动画)

　　MainActivity.java主要代码:　　

ImageView image = (ImageView) findViewById(id.image);
Animation loadAnimation = AnimationUtils.loadAnimation(this, R.anim.alpha);
image.startAnimation(loadAnimation);

　　alpha.xml

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

    <alpha
        android:duration="1000"
        android:fromAlpha="0.1"
        android:toAlpha="1.0" >
    </alpha>

</set>

　　② Scale (渐变尺寸缩放动画)

　　MainActivity.java主要代码:

ImageView image = (ImageView) findViewById(id.image);
Animation loadAnimation = AnimationUtils.loadAnimation(this, R.anim.scale);
image.startAnimation(loadAnimation);

 

 

　　scale.xml　　

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

    <scale
        android:duration="2000"
        android:fillAfter="false"
        android:fromXScale="0.0"
        android:fromYScale="0.0"
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="1.0"
        android:toYScale="1.0" />

</set>

 

 

 

　　③ Translate (位置移动动画)

　　MainActivity.java主要代码:　　

ImageView image = (ImageView) findViewById(id.image);
Animation loadAnimationloadAnimation = AnimationUtils.loadAnimation(this, R.anim.translate);
image.startAnimation(loadAnimation);

　　translate.xml

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

    <translate
        android:duration="1000"
        android:fromXDelta="10"
        android:fromYDelta="10"
        android:toXDelta="100"
        android:toYDelta="100" />

</set>

 

　　④ Rotate (旋转动画)

　　MainActivity.java主要代码:

ImageView image = (ImageView) findViewById(id.image);
Animation loadAnimation loadAnimation = AnimationUtils.loadAnimation(this, R.anim.rotate);
image.startAnimation(loadAnimation);

 

　　rotate.xml　　

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

    <rotate
        android:duration="1000"
        android:fromDegrees="0"
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toDegrees="+360" />

</set>

 

(2) Layout Animation (布局动画)

　　MainActivity.java主要代码:

Intent intent=new Intent(MainActivity.this,ListActivity.class);
startActivity(intent);

 

　　ListActivity.java代码:

package com.example.caobotao.learnanimation;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.animation.AnimationUtils;
import android.view.animation.LayoutAnimationController;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class ListActivity extends Activity{
    
    private ListView listView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.list_layout);
        listView=(ListView) findViewById(R.id.listView);
        List<String>list=new ArrayList<String>();
        for(int i=0;i<20;i++)
        {
            list.add("示例"+i);
        }
        ArrayAdapter<String>adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);
        listView.setAdapter(adapter);
        LayoutAnimationController lac=new LayoutAnimationController(AnimationUtils.loadAnimation(this, R.anim.zoom_in));
        lac.setOrder(LayoutAnimationController.ORDER_NORMAL);
        listView.setLayoutAnimation(lac);
        listView.startLayoutAnimation();
    }

}

 

　　zoom_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/decelerate_interpolator" >
  
  <scale
        android:duration="1000"
        android:fromXScale="0.1"
        android:fromYScale="0.1"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="1.0"
        android:toYScale="1.0" />
  <alpha
        android:duration="1000"
        android:fromAlpha="0"
        android:toAlpha="1.0" />
</set>

 

(3) Frame Animation (帧动画)

　　MainActivity.java主要代码:

ImageView image = (ImageView) findViewById(id.image);
image.setImageResource(R.drawable.anim_list);
AnimationDrawable animationDrawable = (AnimationDrawable) image.getDrawable();
animationDrawable.start();

 

 　　anim_list.xml

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

    <item
        android:drawable="@mipmap/one"
        android:duration="500"/>
    <item
        android:drawable="@mipmap/two"
        android:duration="500"/>
    <item
        android:drawable="@mipmap/three"
        android:duration="500"/>
    <item
        android:drawable="@mipmap/four"
        android:duration="500"/>
    <item
        android:drawable="@mipmap/five"
        android:duration="500"/>
    <item
        android:drawable="@mipmap/six"
        android:duration="500"/>

</animation-list>