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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>
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原文地址：http://www.cnblogs.com/caobotao/p/4986366.html
