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Material Designer的代码实现（五）—— ActivityOptionsCompat
新版的V4包中有了这个类—— ActivityOptionsCompat，我们可以通过这个类来启动activity和添加动画。但不幸的是所有的动画都没有给2.x用的，大部分动画也对4.x不兼容。好消息是这个类是兼容2.x的，通过这个类编写的嗲吗，虽然不能给2.x带来动画，但也能确保全版本稳定运行，不会需要我们判断版本。也就是说如果你给5.x平台做了动画，其他平台虽然不会执行动画，但仍旧可以稳定打开activity。下面我们通过远吗进行分析下这个类。
1.文档解释
（1）ActivityOptionsCompat.makeCustomAnimation(context, enterResId, exitResId)
简单做一个定制的动画，这个参数很简单，传入一个进入的动画的id，和移除动画的id即可
//让新的Activity从一个小的范围扩大到全屏 ActivityOptionsCompat options = ActivityOptionsCompat.makeCustomAnimation(this, R.anim.slide_bottom_in, R.anim.slide_bottom_out); startNewAcitivity(options);
private void startNewAcitivity(ActivityOptionsCompat options) { Intent intent = new Intent(this,DetailActivity.class); ActivityCompat.startActivity(this, intent, options.toBundle()); }
这个我感觉没什么用处，类似于
Intent intent = new Intent(this,DetailActivity.class); startActivity(intent); overridePendingTransition(R.anim.slide_bottom_in, android.R.anim.fade_out);
还不如直接用这个全版本的overridePendingTransition呢
（2）ActivityOptionsCompat.makeScaleUpAnimation(source, startX, startY, startWidth, startHeight)
这个在4.x上有用，可以实现新的Activity从某个固定的坐标以某个大小扩大至全屏，我觉得效果挺不错的。
这个新Activity就是从根据那个图片的坐标来拉伸展示的，对于相册是很好的展示效果。
private void scaleUpAnimation(View view) { //让新的Activity从一个小的范围扩大到全屏 ActivityOptionsCompat options = ActivityOptionsCompat.makeScaleUpAnimation(view, //The View that the new activity is animating from (int)view.getWidth()/2, (int)view.getHeight()/2, //拉伸开始的坐标 0, 0);//拉伸开始的区域大小，这里用（0，0）表示从无到全屏 startNewAcitivity(options); }
private void startNewAcitivity(ActivityOptionsCompat options) { Intent intent = new Intent(this,DetailActivity.class); ActivityCompat.startActivity(this, intent, options.toBundle()); }
（3）ActivityOptionsCompat.makeSceneTransitionAnimation(activity, sharedElement, sharedElementName)
当你需要当前界面中的某个元素和新界面中的元素有关时，你可以使用这个动画。效果很赞~！
这个图片就是通过动画和上一个界面的图片进行了联系。
要使用这个方法就必须给两个不同Activity的中的布局元素设定同样的一个android:transitionName，然后还需要一个标志来告诉Window执行动画，因为这个只是在5.x上有效，不是本文的讨论范围。详细看官方文档即可。
标志：etWindow().requestFeature(Window.FEATURE_CONTENT_TRANSITIONS);
也可以参考文章：
http://blog.csdn.net/a396901990/article/details/40187203
http://blog.jobbole.com/77015/
（4）ActivityOptionsCompat.makeSceneTransitionAnimation((Activity arg0, Pair<View, String>... arg1)
这个方法用于多个元素和新的Activity相关的情况，注意下第二个参数Pair这个键值对后面有...，标明是可以传入多个Pair对象的。
（5）ActivityOptionsCompat.makeThumbnailScaleUpAnimation(source, thumbnail, startX, startY)
这个方法可以用于4.x上，是将一个小块的Bitmpat进行拉伸的动画。
2.源码
看完了文档，心里各种凄凉。很多优秀的动画都不向下兼容，那么我们去远吗中看看我们的主流4.x版本能用上什么。
public class ActivityOptionsCompat { /** * Create an ActivityOptions specifying a custom animation to run when the * activity is displayed. * * @param context Who is defining this. This is the application that the * animation resources will be loaded from. * @param enterResId A resource ID of the animation resource to use for the * incoming activity. Use 0 for no animation. * @param exitResId A resource ID of the animation resource to use for the * outgoing activity. Use 0 for no animation. * @return Returns a new ActivityOptions object that you can use to supply * these options as the options Bundle when starting an activity. */ public static ActivityOptionsCompat makeCustomAnimation(Context context, int enterResId, int exitResId) { if (Build.VERSION.SDK_INT >= 16) { return new ActivityOptionsImplJB( ActivityOptionsCompatJB.makeCustomAnimation(context, enterResId, exitResId)); } return new ActivityOptionsCompat(); } /** * Create an ActivityOptions specifying an animation where the new activity is * scaled from a small originating area of the screen to its final full * representation. * <p/> * If the Intent this is being used with has not set its * {@link android.content.Intent#setSourceBounds(android.graphics.Rect)}, * those bounds will be filled in for you based on the initial bounds passed * in here. * * @param source The View that the new activity is animating from. This * defines the coordinate space for startX and startY. * @param startX The x starting location of the new activity, relative to * source. * @param startY The y starting location of the activity, relative to source. * @param startWidth The initial width of the new activity. * @param startHeight The initial height of the new activity. * @return Returns a new ActivityOptions object that you can use to supply * these options as the options Bundle when starting an activity. */ public static ActivityOptionsCompat makeScaleUpAnimation(View source, int startX, int startY, int startWidth, int startHeight) { if (Build.VERSION.SDK_INT >= 16) { return new ActivityOptionsImplJB( ActivityOptionsCompatJB.makeScaleUpAnimation(source, startX, startY, startWidth, startHeight)); } return new ActivityOptionsCompat(); } /** * Create an ActivityOptions specifying an animation where a thumbnail is * scaled from a given position to the new activity window that is being * started. * <p/> * If the Intent this is being used with has not set its * {@link android.content.Intent#setSourceBounds(android.graphics.Rect)}, * those bounds will be filled in for you based on the initial thumbnail * location and size provided here. * * @param source The View that this thumbnail is animating from. This * defines the coordinate space for startX and startY. * @param thumbnail The bitmap that will be shown as the initial thumbnail * of the animation. * @param startX The x starting location of the bitmap, relative to source. * @param startY The y starting location of the bitmap, relative to source. * @return Returns a new ActivityOptions object that you can use to supply * these options as the options Bundle when starting an activity. */ public static ActivityOptionsCompat makeThumbnailScaleUpAnimation(View source, Bitmap thumbnail, int startX, int startY) { if (Build.VERSION.SDK_INT >= 16) { return new ActivityOptionsImplJB( ActivityOptionsCompatJB.makeThumbnailScaleUpAnimation(source, thumbnail, startX, startY)); } return new ActivityOptionsCompat(); }
/* * Copyright (C) 2012 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package android.support.v4.app;import android.app.ActivityOptions;import android.content.Context;import android.graphics.Bitmap;import android.os.Bundle;import android.view.View;class ActivityOptionsCompatJB { public static ActivityOptionsCompatJB makeCustomAnimation(Context context, int enterResId, int exitResId) { return new ActivityOptionsCompatJB( ActivityOptions.makeCustomAnimation(context, enterResId, exitResId)); } public static ActivityOptionsCompatJB makeScaleUpAnimation(View source, int startX, int startY, int startWidth, int startHeight) { return new ActivityOptionsCompatJB( ActivityOptions.makeScaleUpAnimation(source, startX, startY, startWidth, startHeight)); } public static ActivityOptionsCompatJB makeThumbnailScaleUpAnimation(View source, Bitmap thumbnail, int startX, int startY) { return new ActivityOptionsCompatJB( ActivityOptions.makeThumbnailScaleUpAnimation(source, thumbnail, startX, startY)); } private final ActivityOptions mActivityOptions; private ActivityOptionsCompatJB(ActivityOptions activityOptions) { mActivityOptions = activityOptions; } public Bundle toBundle() { return mActivityOptions.toBundle(); } public void update(ActivityOptionsCompatJB otherOptions) { mActivityOptions.update(otherOptions.mActivityOptions); }}
我们可以完全了解到，4.x上能用的就这么三个动画效果，第一个第三我个人认为没啥用处，第二个效果好点，但仅仅适用于照片墙。于是就很悲剧了，这个新的类仅仅带来了低版本兼容不报错的效果，对于新的特性各种不支持。反过来想，反正动画这个东西对用户来说好看和不好看也没差，功能是最主要的。
这个是讲5.0动画效果的文章，如果做5.0开发的话可以看看。但我估计在4.x主流的今天，这些特效还只能自己写兼容包了。
http://blog.csdn.net/a396901990/article/details/40187203
Material Designer的代码实现（五）—— ActivityOptionsCompat