Android - How Can I Make An Animation Of An Image Occur At A Certain Interval?

I'm taking a Coursera class on Android programming. Here's a illustration of what I'm trying to do... Here's the code I have so far... XML:

/res/anim/foot.xml

<?xml version="1.0" encoding="utf-8"?><setxmlns:android="http://schemas.android.com/apk/res/android"><translateandroid:fromYDelta="0"android:toYDelta="-15"android:duration="400"/><alphaandroid:fromAlpha="1.0"android:toAlpha="0"android:duration="400" /></set>

Thats straight off the top of my head (thus untested) but should be plenty to get you going in the right direction