本文是對API中的方法做了介紹，如果想要看如何讓這些方法兼容4.x或2.x可以看這篇文章：
用開源項目ActivityOptionsICS讓ActivityOptions的動畫實現兼容
新版的V4包中有了這個類—— ActivityOptionsCompat，我們可以通過這個類來啟動activity和添加動畫。但不幸的是所有的動畫都沒有給2.x用的，大部分動畫也對4.x不兼容。我們就來看看是否讓低版本也兼容這些動畫效果。
好消息是這個類是兼容2.x的，通過這個類編寫的嗲嗎，雖然不能給2.x帶來動畫，但也能確保全版本穩定運行，不會需要我們判斷版本。也就是說如果你給5.x平台做了動畫，其他平台雖然不會執行動畫，但仍舊可以穩定打開activity。下面我們通過遠嗎進行分析下這個類。
1.文檔解釋
（1）ActivityOptionsCompat.makeCustomAnimation(context, enterResId, exitResId)
簡單做一個定制的動畫，這個參數很簡單，傳入一個進入的動畫的id，和移除動畫的id即可
//讓新的Activity從一個小的范圍擴大到全屏 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());
}
這個我感覺沒什么用處，類似於
Intent intent = new Intent(this,DetailActivity.class); startActivity(intent); overridePendingTransition(R.anim.slide_bottom_in, android.R.anim.fade_out);
還不如直接用這個全版本的overridePendingTransition呢
（2）ActivityOptionsCompat.makeScaleUpAnimation(source, startX, startY, startWidth, startHeight)
這個在4.x上有用，可以實現新的Activity從某個固定的坐標以某個大小擴大至全屏，我覺得效果挺不錯的。
這個新Activity就是從根據那個圖片的坐標來拉伸展示的，對於相冊是很好的展示效果。
private void scaleUpAnimation(View view) { //讓新的Activity從一個小的范圍擴大到全屏 ActivityOptionsCompat options = ActivityOptionsCompat.makeScaleUpAnimation(view, //The View that the new activity is animating from (int)view.getWidth()/2, (int)view.getHeight()/2, //拉伸開始的坐標 0, 0);//拉伸開始的區域大小，這里用（0，0）表示從無到全屏 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)
當你需要當前界面中的某個元素和新界面中的元素有關時，你可以使用這個動畫。效果很贊~！
這個圖片就是通過動畫和上一個界面的圖片進行了聯系。
要使用這個方法就必須給兩個不同Activity的中的布局元素設定同樣的一個android:transitionName，然后還需要一個標志來告訴Window執行動畫，因為這個只是在5.x上有效，不是本文的討論范圍。詳細看官方文檔即可。
標志：etWindow().requestFeature(Window.FEATURE_CONTENT_TRANSITIONS);
也可以參考文章：
http://blog.csdn.net/a396901990/article/details/40187203
http://blog.jobbole.com/77015/
（4）ActivityOptionsCompat.makeSceneTransitionAnimation((Activity arg0, Pair<View, String>... arg1)
這個方法用於多個元素和新的Activity相關的情況，注意下第二個參數Pair這個鍵值對后面有...，標明是可以傳入多個Pair對象的。
（5）ActivityOptionsCompat.makeThumbnailScaleUpAnimation(source, thumbnail, startX, startY)
這個方法可以用於4.x上，是將一個小塊的Bitmpat進行拉伸的動畫。
詳細使用方式，參考官方文檔：https://developer.android.com/training/material/animations.html
2.源碼
看完了文檔，心里各種凄涼。很多優秀的動畫都不向下兼容，那么我們去源碼中看看我們的主流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); } }
我們可以完全了解到，4.x上能用的就這么三個動畫效果，第一個第三我個人認為沒啥用處，第二個效果好點，但僅僅適用於照片牆。於是就很悲劇了，這個新的類僅僅帶來了低版本兼容不報錯的效果，對於新的特性各種不支持。反過來想，反正動畫這個東西對用戶來說好看和不好看也沒差，功能是最主要的。
這個是講5.0動畫效果的文章，如果做5.0開發的話可以看看。但我估計在4.x主流的今天，這些特效還只能自己寫兼容包了。
http://blog.csdn.net/a396901990/article/details/40187203
動畫
好了，雖然我們不能用這么酷炫的動畫，但我們還可以用傳統動畫嘛。我研究了下圖片放大的效果，寫了一篇文章，其實還可以繼續優化。貼上文章地址和效果圖。
地址：http://www.cnblogs.com/tianzhijiexian/p/4095756.html
效果圖：
下面分享下使用動畫的方法，在啟動activity的時候進行設置，然后在開啟的activity中的onBackPressed()也進行相應的設置，就能出現流暢的效果啦。
舉例：
MainActivity
private void simpleStartActivity() { Intent intent = new Intent(this,DetailActivity.class); startActivity(intent); //overridePendingTransition(R.anim.slide_left_in, R.anim.slide_right_out); overridePendingTransition(R.anim.slide_bottom_in, android.R.anim.fade_out); }
DetailActivity
package com.kale.activityoptionstest; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; public class DetailActivity extends ActionBarActivity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.item_detail); } @Override public void onBackPressed() { super.onBackPressed(); //overridePendingTransition(R.anim.slide_right_in, R.anim.slide_left_out); overridePendingTransition(0, R.anim.slide_bottom_out); } }
這樣就可以實現，第二個Activity從屏幕下方出現，按下返回鍵后會從屏幕下方離開了。
最后給出幾個常用的動畫效果
slide_bottom_in.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_decelerate_interpolator" android:shareInterpolator="true"> <translate android:duration="300" android:fromYDelta="100%p" android:toYDelta="0.0" /> </set>
slide_bottom_out.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_decelerate_interpolator" android:shareInterpolator="true"> <translate android:duration="300" android:fromYDelta="0.0" android:toYDelta="100%p" /> </set>
slide_left_in.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="300" android:fromXDelta="-100.0%p" android:toXDelta="0.0" /> </set>
slide_left_out.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="300" android:fromXDelta="0.0" android:toXDelta="-100.0%p" /> </set>
slide_right_in.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="300" android:fromXDelta="100.0%p" android:toXDelta="0.0" /> </set>
slide_right_out.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="300" android:fromXDelta="0.0" android:toXDelta="100.0%p" /> </set>
slide_top_in.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:startOffset="50"> <translate android:fromYDelta="-100%p" android:toYDelta="0%p" android:duration="300"/> </set>
slide_top_out.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:startOffset="50" > <translate android:duration="300" android:fromYDelta="0%p" android:toYDelta="-100%p" /> </set>