The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...
<?xml version="1.0" encoding="utf-8"?>
<!--
/* //device/apps/common/res/anim/fade_in.xml
**
** Copyright 2007, The Android开源工程
**
** 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.
*/
-->
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/decelerate_interpolator">
<scale android:fromXScale="0.8" android:toXScale="1.0"
android:fromYScale="0.9" android:toYScale="1.0"
android:pivotX="100%" android:pivotY="100%" android:duration="200" />
<alpha android:fromAlpha="0.5" android:toAlpha="1.0" android:duration="200" />
</set>