What is Animation?
Animation
extends Object
implements Cloneable
Abstraction for an Animation that can be applied to Views, Surfaces, or other objects.
AlphaAnimation
extends Animation
An animation that controls the alpha level of an object. Useful for fading things in and out. This animation ends up changing the alpha property of aTransformation
AlphaAnimation(Context context, AttributeSet attrs)
Constructor used when an AlphaAnimation is loaded from a resource.
AlphaAnimation(float fromAlpha, float toAlpha)
Constructor to use when building an AlphaAnimation from code
AnimationSet
extends Animation
Represents a group of Animations that should be played together. The transformation of each individual animation are composed together into a single transform. If AnimationSet sets any properties that its children also set (for example, duration or fillBefore), the values of AnimationSet override the child values.
在代码中实现动画效果的方法:
ImageView imageView = (ImageView) findViewById(R.id.imageView1); AnimationSet animationSet = new AnimationSet(true); AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1); alphaAnimation.setDuration(1000); alphaAnimation.setStartOffset(10000); animationSet.addAnimation(alphaAnimation); //animationSet.setStartOffset(10000); animationSet.setFillBefore(false); animationSet.setFillAfter(true); imageView.startAnimation(animationSet);
在XML文件中实现动画效果的方法:
① 在res目录下创建一个anim文件夹,在里面添加一个alpha.xml文件:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator" android:fillAfter="true" android:fillBefore="false"> <alpha android:fromAlpha="1.0" android:toAlpha="0.0" android:startOffset="1000" android:duration="1000" /> </set>
② 在Activity中使用AnimationUtils获取Animation并进行设置:
Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.alpha); imageView.startAnimation(animation);
ScaleAnimation
extends Animation
An animation that controls the scale of an object. You can specify the point to use for the center of scaling.
ScaleAnimation(Context context, AttributeSet attrs)
Constructor used when a ScaleAnimation is loaded from a resource.
ScaleAnimation(float fromX, float toX, float fromY, float toY)
Constructor to use when building a ScaleAnimation from code
ScaleAnimation(float fromX, float toX, float fromY, float toY, float pivotX, float pivotY)
Constructor to use when building a ScaleAnimation from code
ScaleAnimation(float fromX, float toX, float fromY, float toY, int pivotXType, float pivotXValue, int pivotYType, float pivotYValue)
Constructor to use when building a ScaleAnimation from code
在代码中实现动画效果:
ImageView imageView = (ImageView) findViewById(R.id.imageView1); AnimationSet animationSet = new AnimationSet(true); ScaleAnimation scaleAnimation = new ScaleAnimation(1, 0.5f, 1, 0.5f, Animation.RELATIVE_TO_SELF, 1f, Animation.RELATIVE_TO_SELF, 1f); animationSet.addAnimation(scaleAnimation); animationSet.setDuration(1000); imageView.startAnimation(animationSet);
在XML文件中实现动画效果的方法:
① 在res的anim文件夹下,创建一个scale.xml文件:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator"> <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="2000" /> </set>
② 在Activity中使用AnimationUtils获取Animation并进行设置:
Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.scale); imageView.startAnimation(animation);
RotateAnimation
extends Animation
An animation that controls the rotation of an object. This rotation takes place int the X-Y plane. You can specify the point to use for the center of the rotation, where (0,0) is the top left point. If not specified, (0,0) is the default rotation point.
RotateAnimation(Context context, AttributeSet attrs)
Constructor used when a RotateAnimation is loaded from a resource.
RotateAnimation(float fromDegrees, float toDegrees)
Constructor to use when building a RotateAnimation from code.
RotateAnimation(float fromDegrees, float toDegrees, float pivotX, float pivotY)
Constructor to use when building a RotateAnimation from code
RotateAnimation(float fromDegrees, float toDegrees, int pivotXType, float pivotXValue, int pivotYType, float pivotYValue)
Constructor to use when building a RotateAnimation from code
在代码中实现动画效果:
ImageView imageView = (ImageView) findViewById(R.id.imageView1); AnimationSet animationSet = new AnimationSet(true); RotateAnimation rotateAnimation = new RotateAnimation(0, 360, Animation.RELATIVE_TO_PARENT, 0.5f, Animation.RELATIVE_TO_PARENT, 0.5f); rotateAnimation.setDuration(1000); animationSet.addAnimation(rotateAnimation); imageView.startAnimation(animationSet);
在XML文件中实现动画效果的方法:
① 在res的anim文件夹下,创建一个rotate.xml文件:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator"> <rotate android:fromDegrees="0" android:toDegrees="+360" android:pivotX="50%" android:pivotY="50%" android:duration="1000" /> </set>
② 在Activity中使用AnimationUtils获取Animation并进行设置:
Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.rotate); imageView.startAnimation(animation);
TranslateAnimation
extends Animation
An animation that controls the position of an object.
TranslateAnimation(Context context, AttributeSet attrs)
Constructor used when a TranslateAnimation is loaded from a resource.
TranslateAnimation(float fromXDelta, float toXDelta, float fromYDelta, float toYDelta)
Constructor to use when building a TranslateAnimation from code
TranslateAnimation(int fromXType, float fromXValue, int toXType, float toXValue, int fromYType, float fromYValue, int toYType, float toYValue)
Constructor to use when building a TranslateAnimation from code
在代码中实现动画效果:
ImageView imageView = (ImageView) findViewById(R.id.imageView1); AnimationSet animationSet = new AnimationSet(true); TranslateAnimation translateAnimation = new TranslateAnimation( Animation.RELATIVE_TO_SELF, 0f, Animation.RELATIVE_TO_SELF, 1.0f, Animation.RELATIVE_TO_SELF, 0f, Animation.RELATIVE_TO_SELF, 1.0f); translateAnimation.setDuration(1000); animationSet.addAnimation(translateAnimation); imageView.startAnimation(animationSet);
在XML文件中实现动画效果的方法:
① 在res的anim文件夹下,创建一个translate.xml文件:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator"> <translate android:fromXDelta="0%p" android:toXDelta="100%p" android:fromYDelta="0%p" android:toYDelta="100%p" android:duration="1000" /> </set>
其中100%p表示相对于父空间的位置
② 在Activity中使用AnimationUtils获取Animation并进行设置:
Animation animation = (Animation) AnimationUtils.loadAnimation(MainActivity.this, R.anim.translate); imageView.startAnimation(animation);
AnimationSet animationSet = new AnimationSet(false); AlphaAnimation alpha = new AlphaAnimation(1.0f, 0.0f); ScaleAnimation scale = new ScaleAnimation(1, 0.5f, 1, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); animationSet.addAnimation(alpha); animationSet.addAnimation(scale); animationSet.setDuration(2000); animationSet.setStartOffset(1000); animationSet.setFillAfter(true); imageView.startAnimation(animationSet);
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" android:shareInterpolator="true" android:fillAfter="true"> <alpha android:fromAlpha="1.0" android:toAlpha="0.0" android:startOffset="1000" android:fillAfter="true" android:duration="2000" /> <scale android:fromXScale="1.0" android:toXScale="0.5" android:fromYScale="1.0" android:toYScale="0.5" android:pivotX="50%" android:pivotY="50%" android:startOffset="1000" android:duration="2000" /> </set>
Activity中的代码:
Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.alpha); imageView.startAnimation(animation);
什么是Interpolator
Interpolator
extends Object
AccelerateDecelerateInterpolator:
AccelerateDecelerateInterpolator
extends Object
implements Interpolator
An interpolator where the rate of change starts and ends slowly but accelerates through the middle.
AccelerateInterpolater:
AccelerateInterpolator
extends Object
implements Interpolator
An interpolator where the rate of change starts out slowly and and then accelerates.
CycleInterpolator:
CycleInterpolator
extends Object
implements Interpolator
Repeats the animation for a specified number of cycles. The rate of change follows a sinusoidal pattern.
DecelerateInterpolator:
DecelerateInterpolator
extends Object
implements Interpolator
An interpolator where the rate of change starts out quickly and and then decelerates.
LinearInterpolator:
LinearInterpolator
extends Object
implements Interpolator
An interpolator where the rate of change is constant.
XML文件定义在set标签里或每个动画标签
set标签中定义:
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator" android:shareInterpolator="true" android:fillAfter="true">
每个动画标签中定义:
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator" android:shareInterpolator="false" android:fillAfter="true"> <alpha android:interpolator="@android:anim/accelerate_interpolator" android:fromAlpha="1.0" android:toAlpha="0.0" android:startOffset="1000" android:fillAfter="true" android:duration="2000" /> <scale android:interpolator="@android:anim/accelerate_decelerate_interpolator" android:fromXScale="1.0" android:toXScale="0.5" android:fromYScale="1.0" android:toYScale="0.5" android:pivotX="50%" android:pivotY="50%" android:startOffset="1000" android:duration="2000" /> </set>
在代码中设置:
AnimationSet animationSet = new AnimationSet(true); animationSet.setInterpolator(new AccelerateInterpolator());
或者分别为每个动画设置:
AnimationSet animationSet = new AnimationSet(false); AlphaAnimation alpha = new AlphaAnimation(1.0f, 0.0f); alpha.setInterpolator(new AccelerateInterpolator()); ScaleAnimation scale = new ScaleAnimation(1, 0.5f, 1, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); scale.setInterpolator(new AccelerateDecelerateInterpolator());
① 准备4张图片run1.png,run2.png,run3.png,run4.png分别放到res的三个drawable文件夹中
② 在res的drawable-ldpi目录下创建一个anim_run.xml文件:
<?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/run1" android:duration="100" /> <item android:drawable="@drawable/run2" android:duration="100" /> <item android:drawable="@drawable/run3" android:duration="100" /> <item android:drawable="@drawable/run4" android:duration="100" /> </animation-list>
③ 在Activity中使用xml文件设置ImageView控件imageView的背景源,并获取AnimationDrawable进行显示动画:
imageView.setBackgroundResource(R.drawable.anim_run); AnimationDrawable animationDrawable = (AnimationDrawable)imageView.getBackground(); animationDrawable.start();
什么是LayoutAnimationController?
LayoutAnimationController
extends Object
A layout animation controller is used to animated a layout's, or a view group's, children. Each child uses the same animation but for every one of them, the animation starts at a different time. A layout animation controller is used by ViewGroup to compute the delay by which each child's animation start must be offset. The delay is computed by using characteristics of each child, like its index in the view group. This standard implementation computes the delay by multiplying a fixed amount of miliseconds by the index of the child in its parent view group. Subclasses are supposed to override getDelayForView(android.view.View) to implement a different way of computing the delay. For instance, aGridLayoutAnimationController will compute the delay based on the column and row indices of the child in its parent view group. Information used to compute the animation delay of each child are stored in an instance of LayoutAnimationController.AnimationParameters, itself stored in theViewGroup.LayoutParams of the view.
在使用LayoutAnimationController控制ListView控件的样式效果的方法:
① 在res的anim文件夹中创建一个list_anim.xml文件用于控制ListView控件的动画:
<?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"> <scale android:fromXScale="0.0" android:toXScale="1.0" android:fromYScale="0.0" android:toYScale="1.0" android:pivotX="50%" android:pivotY="50%" android:duration="1000" /> </set>
② 创建一个布局文件item.xml用于设置ListView的item的样式:
<?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/user_name" android:layout_width="180dip" android:layout_height="30dip" android:textSize="10pt" android:singleLine="true" /> <TextView android:id="@+id/user_id" android:layout_width="fill_parent" android:layout_height="fill_parent" android:textSize="10pt" android:singleLine="true"/> </LinearLayout>
③ 在主Activity的布局文件main.xml中添加一个ListView
<ListView android:id="@id/android:list" android:layout_width="fill_parent" android:layout_height="wrap_content" android:scrollbars="vertical" android:layoutAnimation="@anim/anim_layout" />
④ 创建一个MainActivity继承ListActivity,并在onCreate方法中添加如下代码:
ListView listView = getListView(); List<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>(); HashMap<String, String> hm1 = new HashMap<String, String>(); hm1.put("user_name", "arthinking"); hm1.put("user_id", "001"); HashMap<String, String> hm2 = new HashMap<String, String>(); hm2.put("user_name", "Jason"); hm2.put("user_id", "002"); list.add(hm1); list.add(hm2); SimpleAdapter simpleAdapter = new SimpleAdapter(this, list, R.layout.item, new String[] { "user_name", "user_id" }, new int[] { R.id.user_name, R.id.user_id }); listView.setAdapter(simpleAdapter); //通过Animation获取LayoutAnimationController对ListView进行设置 Animation animation = (Animation)AnimationUtils.loadAnimation(MainActivity.this, R.anim.list_anim); LayoutAnimationController lac = new LayoutAnimationController(animation); lac.setOrder(LayoutAnimationController.ORDER_NORMAL); lac.setDelay(0.5f); listView.setLayoutAnimation(lac);
这样,运行程序,显示的ListView就会按照xml文件中预置的动画效果显示了。
也可以通过xml文件进行设置动画:
① 在以上步骤的基础之上,在res/anim文件夹下创建一个anim_layout.xml文件:
<?xml version="1.0" encoding="utf-8"?> <layoutAnimation xmlns:android="http://schemas.android.com/apk/res/android" android:delay="1" android:animationOrder="normal" android:animation="@anim/list_anim" />
② main在布局文件的的ListView添加如下属性:
android:layoutAnimation="@anim/anim_layout"
这样就在把MainActivity的onCreate()方法中的
//通过Animation获取LayoutAnimationController对ListView进行设置
注释后的代码删除了,直接使用xml进行动画的控制。
Animation.AnimationListener
android.view.animation.Animation.AnimationListener
An animation listener receives notifications from an animation. Notifications indicate animation related events, such as the end or the repetition of the animation.
包含以下的三个方法:
Notifies the end of the animation.
onAnimationRepeat(Animation animation)
Notifies the repetition of the animation.
onAnimationStart(Animation animation)
Notifies the start of the animation.
① 可以为一个Button添加一个事件:
button.setOnClickListener(new TestAnimationListener());
② 接下来是编写这个TestAnimationListener类,继承AnimationListener,并覆盖里面的三个方法:
//这里获取控件组,R.id.layoutId为main.xml的整体布局标签的id属性值 ViewGroup viewGroup = (ViewGroup)findViewById(R.id.layoutId); private class RemoveAnimationListener implements AnimationListener{ //该方法在淡出效果执行结束之后被调用 @Override public void onAnimationEnd(Animation animation) { //假设这里要在动画执行完之后删除一个TextView viewGroup.removeView(textView); } @Override public void onAnimationRepeat(Animation animation) { System.out.println("onAnimationRepeat"); } @Override public void onAnimationStart(Animation animation) { System.out.println("onAnimationStart"); } }
③ 同样的,在动画效果中添加控件可以按照如下实现
ScaleAnimation scale = new ScaleAnimation(1, 0.5f, 1, 0.5f, scale.setDuration(1000); scale.setStartOffset(100); TextView textView = new TextView(MainActivity.this); textView.setText("add"); viewGroup.addView(textView, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT)); textView.startAnimation(scale);
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