Android Animation动画

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一、Animations介绍
Animations是一个实现android UI界面动画效果的API,Animations提供了一系列的动画效果,可以进行旋转、缩放、淡入淡出等,这些效果可以应用在绝大多数的控件中。
二、Animations的分类
Animations从总体上可以分为两大类:
1.Tweened Animations:该类Animations提供了旋转、移动、伸展和淡出等效果。Alpha——淡入淡出,Scale——缩放效果,Rotate——旋转,Translate——移动效果。
2.Frame-by-frame Animations:这一类Animations可以创建一个Drawable序列,这些Drawable可以按照指定的时间间歇一个一个的显示。

三、Animations的使用方法(代码中使用)
Animations extends Object implements Cloneable
使用TweenedAnimations的步骤:
1.创建一个AnimationSet对象(Animation子类);
2.增加需要创建相应的Animation对象;
3.更加项目的需求,为Animation对象设置相应的数据;
4.将Animatin对象添加到AnimationSet对象当中;
5.使用控件对象开始执行AnimationSet。

  Tweened Animations的分类
  1、Alpha:淡入淡出效果
  2、Scale:缩放效果
  3、Rotate:旋转效果
  4、Translate:移动效果

Animation的四个子类:
  AlphaAnimation、TranslateAnimation、ScaleAnimation、RotateAnimation
四、具体实现

1、main.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="horizontal" >         <Button            android:id="@+id/rotateButton"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="旋转" />         <Button            android:id="@+id/scaleButton"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="缩放" />         <Button            android:id="@+id/alphaButton"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="淡入淡出" />         <Button            android:id="@+id/translateButton"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="移动" />    </LinearLayout>     <LinearLayout        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:orientation="vertical" >         <ImageView            android:id="@+id/image"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:src="@drawable/an" />    </LinearLayout> </LinearLayout>    2、.java文件importandroid.app.Activity;importandroid.os.Bundle;importandroid.view.View;importandroid.view.View.OnClickListener;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;importandroid.view.animation.AnimationSet;importandroid.view.animation.RotateAnimation;importandroid.view.animation.ScaleAnimation;import android.view.animation.TranslateAnimation;importandroid.widget.Button;importandroid.widget.ImageView;public class Animation1Activity extends Activity {    private Button rotateButton = null;    private Button scaleButton = null;    private Button alphaButton = null;    private Button translateButton = null;    private ImageView image = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        rotateButton = (Button)findViewById(R.id.rotateButton);        scaleButton = (Button)findViewById(R.id.scaleButton);        alphaButton = (Button)findViewById(R.id.alphaButton);        translateButton = (Button)findViewById(R.id.translateButton);        image = (ImageView)findViewById(R.id.image);        rotateButton.setOnClickListener(newRotateButtonListener());        scaleButton.setOnClickListener(newScaleButtonListener());        alphaButton.setOnClickListener(newAlphaButtonListener());        translateButton.setOnClickListener(           new TranslateButtonListener());    }    class AlphaButtonListener implementsOnClickListener{       public void onClick(View v) {           //创建一个AnimationSet对象,参数为Boolean型,           //true表示使用Animation的interpolator,false则是使用自己的           AnimationSet animationSet = new AnimationSet(true);           //创建一个AlphaAnimation对象,参数从完全的透明度,到完全的不透明           AlphaAnimation alphaAnimation = new AlphaAnimation(1, 0);           //设置动画执行的时间           alphaAnimation.setDuration(500);           //将alphaAnimation对象添加到AnimationSet当中           animationSet.addAnimation(alphaAnimation);           //使用ImageView的startAnimation方法执行动画           image.startAnimation(animationSet);       }    }    class RotateButtonListener implementsOnClickListener{       public void onClick(View v) {           AnimationSet animationSet = new AnimationSet(true);           //参数1:从哪个旋转角度开始           //参数2:转到什么角度           //后4个参数用于设置围绕着旋转的圆的圆心在哪里           //参数3:确定x轴坐标的类型,有ABSOLUT绝对坐标、RELATIVE_TO_SELF相对于自身坐标、RELATIVE_TO_PARENT相对于父控件的坐标           //参数4:x轴的值,0.5f表明是以自身这个控件的一半长度为x轴           //参数5:确定y轴坐标的类型           //参数6:y轴的值,0.5f表明是以自身这个控件的一半长度为x轴           RotateAnimation rotateAnimation = new RotateAnimation(0, 360,                  Animation.RELATIVE_TO_SELF,0.5f,                  Animation.RELATIVE_TO_SELF,0.5f);           rotateAnimation.setDuration(1000);           animationSet.addAnimation(rotateAnimation);           image.startAnimation(animationSet);       }    }    class ScaleButtonListener implementsOnClickListener{       public void onClick(View v) {           AnimationSet animationSet = new AnimationSet(true);           //参数1:x轴的初始值           //参数2:x轴收缩后的值           //参数3:y轴的初始值           //参数4:y轴收缩后的值           //参数5:确定x轴坐标的类型           //参数6:x轴的值,0.5f表明是以自身这个控件的一半长度为x轴           //参数7:确定y轴坐标的类型           //参数8:y轴的值,0.5f表明是以自身这个控件的一半长度为x轴           ScaleAnimation scaleAnimation = new ScaleAnimation(                  0, 0.1f,0,0.1f,                  Animation.RELATIVE_TO_SELF,0.5f,                  Animation.RELATIVE_TO_SELF,0.5f);           scaleAnimation.setDuration(1000);           animationSet.addAnimation(scaleAnimation);           image.startAnimation(animationSet);       }    }    class TranslateButtonListener implementsOnClickListener{       public void onClick(View v) {           AnimationSet animationSet = new AnimationSet(true);           //参数1~2:x轴的开始位置           //参数3~4:y轴的开始位置           //参数5~6:x轴的结束位置           //参数7~8:x轴的结束位置           TranslateAnimation translateAnimation =              new TranslateAnimation(                  Animation.RELATIVE_TO_SELF,0f,                  Animation.RELATIVE_TO_SELF,0.5f,                  Animation.RELATIVE_TO_SELF,0f,                  Animation.RELATIVE_TO_SELF,0.5f);           translateAnimation.setDuration(1000);           animationSet.addAnimation(translateAnimation);           image.startAnimation(animationSet);       }    }}Tween Animations的通用方法  1、setDuration(long durationMills)  设置动画持续时间(单位:毫秒)  2、setFillAfter(Boolean fillAfter)  如果fillAfter的值为true,则动画执行后,控件将停留在执行结束的状态  3、setFillBefore(Boolean fillBefore)  如果fillBefore的值为true,则动画执行后,控件将回到动画执行之前的状态  4、setStartOffSet(long startOffSet)  设置动画执行之前的等待时间  5、setRepeatCount(int repeatCount)  设置动画重复执行的次数在代码中使用Animations可以很方便的调试、运行,但是代码的可重用性差,重复代码多。同样可以在xml文件中配置Animations,这样做可维护性变高了,只不过不容易进行调试。一、在xml中使用Animations步骤       1.在res文件夹下建立一个anim文件夹;       2.创建xml文件,并首先加入set标签,更改标签如下:<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:interpolator="@android:anim/accelerate_interpolator"></set>3.在该标签当中加入rotate,alpha,scale或者translate标签;<alpha        android:fromAlpha="1.0"        android:toAlpha="0.0"        android:startOffset="500"        android:duration="500"/>4.在代码当中使用AnimationUtils当中装载xml文件,并生成Animation对象。因为Animation是AnimationSet的子类,所以向上转型,用Animation对象接收。Animation animation = AnimationUtils.loadAnimation(                  Animation1Activity.this, R.anim.alpha);           // 启动动画           image.startAnimation(animation);二、具体实现 1、  alpha.xml<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:interpolator="@android:anim/accelerate_interpolator">    <!-- fromAlpha和toAlpha是起始透明度和结束时透明度 -->    <alpha        android:fromAlpha="1.0"        android:toAlpha="0.0"        android:startOffset="500"        android:duration="500"/></set>2、  rotate.xml<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:interpolator="@android:anim/accelerate_interpolator">    <!--        fromDegrees:开始的角度        toDegrees:结束的角度,+表示是正的        pivotX:用于设置旋转时的x轴坐标        例           1)当值为"50",表示使用绝对位置定位           2)当值为"50%",表示使用相对于控件本身定位           3)当值为"50%p",表示使用相对于控件的父控件定位        pivotY:用于设置旋转时的y轴坐标      -->    <rotate        android:fromDegrees="0"        android:toDegrees="+360"        android:pivotX="50%"        android:pivotY="50%"        android:duration="1000"/></set>3、  scale.xml<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:interpolator="@android:anim/accelerate_interpolator">   <!--       起始x轴坐标           止x轴坐标           始y轴坐标           止y轴坐标           轴的坐标           轴的坐标     -->   <scale       android:fromXScale="1.0"       android:toXScale="0.0"       android:fromYScale="1.0"       android:toYScale="0.0"       android:pivotX="50%"       android:pivotY="50%"       android:duration="1000"/></set>4、  translate.xml<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:interpolator="@android:anim/accelerate_interpolator">    <!--           始x轴坐标           止x轴坐标           始y轴坐标           止y轴坐标      -->    <translate        android:fromXDelta="0%"        android:toXDelta="100%"        android:fromYDelta="0%"        android:toYDelta="100%"        android:duration="2000"/></set>5、  .java文件importandroid.app.Activity;importandroid.os.Bundle;importandroid.view.View;importandroid.view.View.OnClickListener;import android.view.animation.Animation;importandroid.view.animation.AnimationUtils;import android.widget.Button;import android.widget.ImageView;public class Animation1Activity extends Activity {    private Button rotateButton = null;    private Button scaleButton = null;    private Button alphaButton = null;    private Button translateButton = null;    private ImageView image = null;    @Override    public void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.main);       rotateButton = (Button) findViewById(R.id.rotateButton);       scaleButton = (Button) findViewById(R.id.scaleButton);       alphaButton = (Button) findViewById(R.id.alphaButton);       translateButton = (Button) findViewById(R.id.translateButton);       image = (ImageView) findViewById(R.id.image);       rotateButton.setOnClickListener(newRotateButtonListener());       scaleButton.setOnClickListener(newScaleButtonListener());       alphaButton.setOnClickListener(newAlphaButtonListener());       translateButton.setOnClickListener(newTranslateButtonListener());    }    class AlphaButtonListener implementsOnClickListener {       public void onClick(View v) {           // 使用AnimationUtils装载动画配置文件           Animation animation = AnimationUtils.loadAnimation(                  Animation1Activity.this, R.anim.alpha);           // 启动动画           image.startAnimation(animation);       }    }    class RotateButtonListener implementsOnClickListener {       public void onClick(View v) {           Animation animation = AnimationUtils.loadAnimation(                  Animation1Activity.this, R.anim.rotate);           image.startAnimation(animation);       }    }    class ScaleButtonListener implementsOnClickListener {       public void onClick(View v) {           Animation animation = AnimationUtils.loadAnimation(                  Animation1Activity.this, R.anim.scale);           image.startAnimation(animation);       }    }    class TranslateButtonListener implementsOnClickListener {       public void onClick(View v) {           Animation animation = AnimationUtils.loadAnimation(Animation1Activity.this, R.anim.translate);           image.startAnimation(animation);       }    }}AnimationSet的具体使用方法       1.AnimationSet是Animation的子类;       2.一个AnimationSet包含了一系列的Animation;       3.针对AnimationSet设置一些Animation的常见属性(如startOffset,duration等),可以被包含在AnimationSet当中的Animation集成;例:一个AnimationSet中有两个Animation,效果叠加第一种方法:doubleani.xml<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:interpolator="@android:anim/accelerate_interpolator"    android:shareInterpolator="true">    <!-- fromAlpha和toAlpha是起始透明度和结束时透明度 -->    <alpha        android:fromAlpha="1.0"        android:toAlpha="0.0"        android:startOffset="500"        android:duration="500"/>    <translate        android:fromXDelta="0%"        android:toXDelta="100%"        android:fromYDelta="0%"        android:toYDelta="100%"        android:duration="2000"/></set>.java文件中classDoubleButtonListener implements OnClickListener {       public void onClick(View v) {           // 使用AnimationUtils装载动画配置文件           Animation animation = AnimationUtils.loadAnimation(                  Animation2Activity.this, R.anim. doubleani);           // 启动动画           image.startAnimation(animation);       }    }第二种方法:.java文件中classDoubleButtonListener implements OnClickListener {       public void onClick(View v) {           AnimationSet animationSet = new AnimationSet(true);           AlphaAnimation alphaAnimation = new AlphaAnimation(1, 0);           RotateAnimation rotateAnimation = new RotateAnimation(0, 360,                  Animation.RELATIVE_TO_SELF,0.5f,                  Animation.RELATIVE_TO_SELF,0.5f);           rotateAnimation.setDuration(1000);           animationSet.addAnimation(rotateAnimation);           animationSet.addAnimation(alphaAnimation);           image.startAnimation(animationSet);       }    }Interpolator的具体使用方法       Interpolator定义了动画变化的速率,在Animations框架当中定义了一下几种Interpolator?         AccelerateDecelerateInterpolator:在动画开始与结束的地方速率改变比较慢,在中间的时候速率快。?         AccelerateInterpolator:在动画开始的地方速率改变比较慢,然后开始加速?         CycleInterpolator:动画循环播放特定的次数,速率改变沿着正弦曲线?         DecelerateInterpolator:在动画开始的地方速率改变比较慢,然后开始减速?         LinearInterpolator:动画以均匀的速率改变分为以下几种情况:1、在set标签中<set xmlns:android="http://schemas.android.com/apk/res/android"    android:interpolator="@android:anim/accelerate_interpolator"/>2、如果在一个set标签中包含多个动画效果,如果想让这些动画效果共享一个Interpolator。    android:shareInterpolator="true"3、如果不想共享一个interpolator,则设置android:shareInterpolator="true",并且需要在每一个动画效果处添加interpolator。<alpha        android:interpolator="@android:anim/accelerate_decelerate_interpolator"        android:fromAlpha="1.0"        android:toAlpha="0.0"        android:startOffset="500"        android:duration="500"/>4、如果是在代码上设置共享一个interpolator,则可以在AnimationSet设置interpolator。AnimationSet animationSet = newAnimationSet(true);animationSet.setInterpolator(new AccelerateInterpolator());5、如果不设置共享一个interpolator则可以在每一个Animation对象上面设置interpolator。AnimationSet animationSet = newAnimationSet(false);alphaAnimation.setInterpolator(new AccelerateInterpolator());rotateAnimation.setInterpolator(new DecelerateInterpolator());Frame-By-Frame Animations的使用方法       Frame-By-Frame Animations是一帧一帧的格式显示动画效果。类似于电影胶片拍摄的手法。 main.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent">    <LinearLayout        android:orientation="horizontal"        android:layout_height="wrap_content"        android:layout_width="wrap_content">       <Button           android:id="@+id/button"               android:layout_width="wrap_content"               android:layout_height="wrap_content"               android:text="运动"/>    </LinearLayout>    <LinearLayout        android:orientation="vertical"        android:layout_width="fill_parent"        android:layout_height="fill_parent">       <ImageView           android:id="@+id/image"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"/>    </LinearLayout></LinearLayout>3、anim.xml<?xml version="1.0" encoding="utf-8"?><animation-list xmlns:android="http://schemas.android.com/apk/res/android"    android:oneshot="false">    <item android:drawable="@drawable/a_01" android:duration="50"/>    <item android:drawable="@drawable/a_02" android:duration="50"/>    <item android:drawable="@drawable/a_03" android:duration="50"/>    <item android:drawable="@drawable/a_04" android:duration="50"/>    <item android:drawable="@drawable/a_05" android:duration="50"/>    <item android:drawable="@drawable/a_06" android:duration="50"/></animation-list>4、.java文件importandroid.app.Activity;importandroid.graphics.drawable.AnimationDrawable;importandroid.os.Bundle;importandroid.view.View;importandroid.view.View.OnClickListener;importandroid.widget.Button;importandroid.widget.ImageView;public class AnimationsActivity extends Activity {    private Button button = null;    private ImageView imageView = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        button = (Button)findViewById(R.id.button);        imageView = (ImageView)findViewById(R.id.image);        button.setOnClickListener(newButtonListener());    }    class ButtonListener implementsOnClickListener{       public void onClick(View v) {           imageView.setBackgroundResource(R.anim.anim);           AnimationDrawable animationDrawable = (AnimationDrawable)              imageView.getBackground();           animationDrawable.start();       }    }}   LayoutAnimationsController1、什么是LayoutAnimationsControllerLayoutAnimationsController可以用于实现使多个控件按顺序一个一个的显示。1)LayoutAnimationsController用于为一个layout里面的控件,或者是一个ViewGroup里面的控件设置统一的动画效果。2)每一个控件都有相同的动画效果。3)控件的动画效果可以在不同的时间显示出来。4)LayoutAnimationsController可以在xml文件当中设置,以可以在代码当中进行设置。2、在xml当中使用LayoutAnimationController1)在res/anim文件夹下创建一个名为list_anim_layout.xml文件:android:delay - 动画间隔时间;子类动画时间间隔 (延迟)   70% 也可以是一个浮点数 如“1.2”等android:animationOrder - 动画执行的循序(normal:顺序,random:随机,reverse:反向显示)android:animation – 引用动画效果文件<layoutAnimation    xmlns:android="http://schemas.android.com/apk/res/android"    android:delay="0.5"    android:animationOrder="normal"    android:animation="@anim/list_anim"/>2)创建list_anim.xml文件,设置动画效果<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:interpolator="@android:anim/accelerate_interpolator"    android:shareInterpolator="true">    <alpha       android:fromAlpha="0.0"       android:toAlpha="1.0"       android:duration="1000"/></set>3)在布局文件main.xml当中为ListVIew添加如下配置<ListView       android:id="@id/android:list"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:scrollbars="vertical"        android:layoutAnimation="@anim/list_anim_layout"/>4)程序结构5)list_anim_layout.xml<layoutAnimation    xmlns:android="http://schemas.android.com/apk/res/android"    android:delay="0.5"    android:animationOrder="normal"    android:animation="@anim/list_anim"/>6)list_anim.xml<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:interpolator="@android:anim/accelerate_interpolator"    android:shareInterpolator="true">    <alpha       android:fromAlpha="0.0"       android:toAlpha="1.0"       android:duration="1000"/></set>7)main.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    >    <ListView       android:id="@id/android:list"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:scrollbars="vertical"        android:layoutAnimation="@anim/list_anim_layout"/>    <Button        android:id="@+id/button"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="测试"/></LinearLayout>8)item.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="horizontal"    android:paddingLeft="10dip"    android:paddingRight="10dip"    android:paddingTop="1dip"    android:paddingBottom="1dip">    <TextView android:id="@+id/name"       android:layout_width="180dip"       android:layout_height="30dip"       android:textSize="5pt"       android:singleLine="true" />    <TextView android:id="@+id/sex"       android:layout_width="fill_parent"       android:layout_height="fill_parent"       android:textSize="5pt"       android:singleLine="true"/></LinearLayout>9)java文件public class Animation2Activity extendsListActivity {    private Button button = null;    private ListView listView = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        listView = getListView();        button = (Button)findViewById(R.id.button);        button.setOnClickListener(newButtonListener());    }    private ListAdapter createListAdapter() {       List<HashMap<String,String>> list =           new ArrayList<HashMap<String,String>>();       HashMap<String,String> m1 = new HashMap<String,String>();       m1.put("name", "bauble");       m1.put("sex", "male");       HashMap<String,String> m2 = new HashMap<String,String>();       m2.put("name", "Allorry");       m2.put("sex", "male");       HashMap<String,String> m3 = new HashMap<String,String>();       m3.put("name", "Allotory");       m3.put("sex", "male");       HashMap<String,String> m4 = new HashMap<String,String>();       m4.put("name", "boolbe");       m4.put("sex", "male");       list.add(m1);       list.add(m2);       list.add(m3);       list.add(m4);       SimpleAdapter simpleAdapter = new SimpleAdapter(              this,list,R.layout.item,new String[]{"name","sex"},              new int[]{R.id.name,R.id.sex});       return simpleAdapter;    }    private class ButtonListener implementsOnClickListener{       public void onClick(View v) {           listView.setAdapter(createListAdapter());       }    }}备注:要将整个动画效果设置到LinerLayout中,可以这样设置:<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:layoutAnimation="@anim/list_anim_layout"> 3、在代码当中使用LayoutAnimationController1)去掉main.xml中的android:layoutAnimation="@anim/list_anim_layout"/>2)创建一个Animation对象:可以通过装载xml文件,或者是直接使用Animation的构造方法创建Animation对象;Animation animation = (Animation) AnimationUtils.loadAnimation(                  Animation2Activity.this, R.anim.list_anim);3)创建LayoutAnimationController对象:  LayoutAnimationController controller = new LayoutAnimationController(animation); 4)设置控件的显示顺序以及延迟时间controller.setOrder(LayoutAnimationController.ORDER_NORMAL); controller.setDelay(0.5f);        5)为ListView设置LayoutAnimationController属性:listView.setLayoutAnimation(controller);完整代码:private class ButtonListener implementsOnClickListener {       public void onClick(View v) {           listView.setAdapter(createListAdapter());           Animation animation = (Animation) AnimationUtils.loadAnimation(                  Animation2Activity.this, R.anim.list_anim);           LayoutAnimationController controller = new LayoutAnimationController(animation);            controller.setOrder(LayoutAnimationController.ORDER_NORMAL);            controller.setDelay(0.5f);           listView.setLayoutAnimation(controller);        }    } AnimationListener1、什么是AnimationListener1).AnimationListener是一个监听器,该监听器在动画执行的各个阶段会得到通知,从而调用相应的方法;2).AnimationListener主要包括如下三个方法:n         ·onAnimationEnd(Animation animation) - 当动画结束时调用n         ·onAnimationRepeat(Animation animation) - 当动画重复时调用n         ·onAniamtionStart(Animation animation) - 当动画启动时调用2、具体实现1)main.xml<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/layout"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent">    <Button android:id="@+id/addButton"       android:layout_width="fill_parent"       android:layout_height="wrap_content"       android:layout_alignParentBottom="true"       android:text="添加图片" />    <Button android:id="@+id/deleteButton"       android:layout_width="fill_parent"       android:layout_height="wrap_content"       android:layout_above="@id/addButton"       android:text="删除图片" />    <ImageView android:id="@+id/image"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_centerInParent="true"       android:layout_marginTop="100dip"       android:src="@drawable/an" /></RelativeLayout>2).java文件public class Animation2Activity extends Activity {    private Button addButton = null;    private Button deleteButton = null;    private ImageView imageView = null;    private ViewGroup viewGroup = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        addButton = (Button)findViewById(R.id.addButton);        deleteButton = (Button)findViewById(R.id.deleteButton);        imageView = (ImageView)findViewById(R.id.image);        //LinearLayout下的一组控件        viewGroup = (ViewGroup)findViewById(R.id.layout);        addButton.setOnClickListener(newAddButtonListener());        deleteButton.setOnClickListener(newDeleteButtonListener());    }    private class AddButtonListener implements OnClickListener{       public void onClick(View v) {           //淡入           AlphaAnimation animation = new AlphaAnimation(0.0f, 1.0f);           animation.setDuration(1000);           animation.setStartOffset(500);           //创建一个新的ImageView           ImageView newImageView = new ImageView(              Animation2Activity.this);           newImageView.setImageResource(R.drawable.an);           viewGroup.addView(newImageView,              new LayoutParams(                  LayoutParams.FILL_PARENT,                  LayoutParams.WRAP_CONTENT));           newImageView.startAnimation(animation);       }    }    private class DeleteButtonListener implements OnClickListener{       public void onClick(View v) {           //淡出           AlphaAnimation animation = new AlphaAnimation(1.0f, 0.0f);           animation.setDuration(1000);           animation.setStartOffset(500);           //为Aniamtion对象设置监听器           animation.setAnimationListener(              new RemoveAnimationListener());           imageView.startAnimation(animation);       }    }    private class RemoveAnimationListener implements AnimationListener{       //动画效果执行完时remove       public void onAnimationEnd(Animation animation) {           System.out.println("onAnimationEnd");           viewGroup.removeView(imageView);       }       public void onAnimationRepeat(Animation animation) {           System.out.println("onAnimationRepeat");       }       public void onAnimationStart(Animation animation) {           System.out.println("onAnimationStart");       }    }}3、总结一下可以在Activity中动态添加和删除控件,方法是:1)取到那个LayoutviewGroup [这里写链接内容](http://blog.csdn.net/allencall/article/details/72834119)= (ViewGroup)findViewById(R.id.layout);2)添加时,先创建对象,然后添加ImageView newImageView = new ImageView(              Animation2Activity.this);newImageView.setImageResource(R.drawable.an);viewGroup.addView(newImageView,              new LayoutParams(                  LayoutParams.FILL_PARENT,                  LayoutParams.WRAP_CONTENT));3)删除时,直接删除。viewGroup.removeView(imageView);

作者:林良军
原文:Android Animation动画