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App->Activity->Animation示例用于演示不同Activity切换时动态效果。
android 5.0例子中定义了6种动画效果：
渐变Fade In
缩放Zoom In
Modern fade In
Modern zoom in
Scale up
Thumbnail zoom
Android 中 Animation 资源可以分为两种：
Animation 中使用的是Tween Animation， 使用的资源为R.anim.fade, R.anim.hold，R.anim.zoom_enter, R.anim.zoom_exit。
其中R.anim.fade， R.anim.zoom_enter分别为Fade In 和 Zoom动画资源。其定义为
fade.xml
<alpha xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator" android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="@android:integer/config_longAnimTime" />
zoom_center.xml
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/decelerate_interpolator"> <scale android:fromXScale="2.0" android:toXScale="1.0" android:fromYScale="2.0" android:toYScale="1.0" android:pivotX="50%p" android:pivotY="50%p" android:duration="@android:integer/config_mediumAnimTime" /> </set>
tween animation 资源定义的格式如下：
<?xml version=”1.0″ encoding=”utf-8″?> <set xmlns:android=”http://schemas.android.com/apk/res/android” android:interpolator=”@[package:]anim/interpolator_resource” android:shareInterpolator=[ ” true ” false “> <alpha android:fromAlpha=”float” android:toAlpha=”float” /> <scale android:fromXScale=”float” android:toXScale=”float” android:fromYScale=”float” android:toYScale=”float” android:pivotX=”float” android:pivotY=”float” /> <translate android:fromXDelta=”float” android:toXDelta=”float” android:fromYDelta=”float” android:toYDelta=”float” /> <rotate android:fromDegrees=”float” android:toDegrees=”float” android:pivotX=”float” android:pivotY=”float” /> <set> … </set> </set>
<set> 为其它animation类型<alpha>,<scale>,<translate>和<rotate>或其它<set>的容器。
android:interpolator 为Interpolator资源ID，Interpolator定义了动画的变化速率，动画的各帧的显示可以加速，减速，重复显示。
android:shareInterpolator 如果想为<set>中的各个子动画定义共享interpolator，shareInterpolator 则设为true.
<alpha> 定义Fade in ,Fade out 动画，其对应的Android类AlphaAnimation，参数由fromAlpha,toAlpha定义。
<scale>定义缩放动画，其对应的Android类为ScaleAnimation，参数由 fromXScale,toXScale,fromYScale,toYScale,pivotX,pivotY定义，pivotX,pivotY定义了 缩放时的中心。
<translate>定义平移动画，其对应的Android类为TranslateAnimation，参数由fromXDelta,toXDelta,fromYDelta,toYDelta定义。
<rotate>定义选择动画，其对应的Android类RotateAnimation，参数由fromDegrees,toDegrees,pivotX,pivotY， pivotX,pivotY定义选择中心。
Animation中的Fade In和Zoom In按钮的事件处理代码：
private OnClickListener mFadeListener = new OnClickListener() { public void onClick(View v) { // Request the next activity transition (here starting a new one). startActivity(new Intent(Animation.this, AlertDialogSamples.class)); // Supply a custom animation. This one will just fade the new // activity on top. Note that we need to also supply an animation // (here just doing nothing for the same amount of time) for the // old activity to prevent it from going away too soon. overridePendingTransition(R.anim.fade, R.anim.hold); } }; private OnClickListener mZoomListener = new OnClickListener() { public void onClick(View v) { // Request the next activity transition (here starting a new one). startActivity(new Intent(Animation.this, AlertDialogSamples.class)); // This is a more complicated animation, involving transformations // on both this (exit) and the new (enter) activity. Note how for // the duration of the animation we force the exiting activity // to be Z-ordered on top (even though it really isn‘t) to achieve // the effect we want. overridePendingTransition(R.anim.zoom_enter, R.anim.zoom_exit); } };
从代码可以看到Activity Animation到其它Activity Controls1 切换的动画使用overridePendingTransition 来定义，函数overridePendingTransition(int enterAnim, int exitAnim) 必须定义在StartActivity（Intent）或是 Activity.finish()之后来定义两个Activity切换时的动画，enterAnim 为新Activity出现时动画效果，exitAnim则定义了当前Activity退出时动画效果。
剩下的Modern fade In， Modern zoom in， Scale up ，Thumbnail zoom使用ActivityOptions实现Activity跳转的动画效果：
private OnClickListener mModernFadeListener = new OnClickListener() { public void onClick(View v) { // Create the desired custom animation, involving transformations // on both this (exit) and the new (enter) activity. Note how for // the duration of the animation we force the exiting activity // to be Z-ordered on top (even though it really isn‘t) to achieve // the effect we want. ActivityOptions opts = ActivityOptions.makeCustomAnimation(Animation.this, R.anim.fade, R.anim.hold); // Request the activity be started, using the custom animation options. startActivity(new Intent(Animation.this, AlertDialogSamples.class), opts.toBundle()); } }; private OnClickListener mModernZoomListener = new OnClickListener() { public void onClick(View v) { // Create a more complicated animation, involving transformations // on both this (exit) and the new (enter) activity. Note how for // the duration of the animation we force the exiting activity // to be Z-ordered on top (even though it really isn‘t) to achieve // the effect we want. ActivityOptions opts = ActivityOptions.makeCustomAnimation(Animation.this, R.anim.zoom_enter, R.anim.zoom_enter); // Request the activity be started, using the custom animation options. startActivity(new Intent(Animation.this, AlertDialogSamples.class), opts.toBundle()); } }; private OnClickListener mScaleUpListener = new OnClickListener() { public void onClick(View v) { // Create a scale-up animation that originates at the button // being pressed. ActivityOptions opts = ActivityOptions.makeScaleUpAnimation( v, 0, 0, v.getWidth(), v.getHeight()); // Request the activity be started, using the custom animation options. startActivity(new Intent(Animation.this, AlertDialogSamples.class), opts.toBundle()); } }; private OnClickListener mZoomThumbnailListener = new OnClickListener() { public void onClick(View v) { // Create a thumbnail animation. We are going to build our thumbnail // just from the view that was pressed. We make sure the view is // not selected, because by the time the animation starts we will // have finished with the selection of the tap. v.setDrawingCacheEnabled(true); v.setPressed(false); v.refreshDrawableState(); Bitmap bm = v.getDrawingCache(); Canvas c = new Canvas(bm); //c.drawARGB(255, 255, 0, 0); ActivityOptions opts = ActivityOptions.makeThumbnailScaleUpAnimation( v, bm, 0, 0); // Request the activity be started, using the custom animation options. startActivity(new Intent(Animation.this, AlertDialogSamples.class), opts.toBundle()); v.setDrawingCacheEnabled(false); } };
Activity跳转动画是指一个Activity跳转到另外一个Activity的动画效果，我们可以通过Acitivity的overridePendingTransition()方法实现跳转动画。
这个函数接受两个参数：
这个方法必须在startActivity方法或者finish方法之后调用。
示例：
Intent intent = new Intent(MainActivity.this,OtherActivity.class); startActivity(intent); overridePendingTransition(R.anim.push_up_in,R.anim.push_up_out);
Android 4.1（API16）提供了一个新类ActivityOptions,用来实现Activity的切换动画。
ActivityOptions类提供了三个方法
通过这三个方法中的一个就可以创建一个ActivityOptions示例，然后调用toBundle()方法获取一个Bundle对象，传递给startActivity方法。
示例：
Intent intent = new Intent(MainActivity.this,OtherActivity.class); ActivityOptions opts = ActivityOptions.makeCustomAnimation(MainActivity.this, R.anim.fade, R.anim.hold); startActivity(intent, opts.toBundle());
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原文地址：http://www.cnblogs.com/dongdong230/p/4305888.html
