Description: One example of time change the desktop, well, it is worth learning, hope you can enjoy!
File list (Check if you may need any files):
ch08_changewallpaper
....................\.classpath
....................\.project
....................\AndroidManifest.xml
....................\assets
....................\bin
....................\...\ch08_changewallpaper.apk
....................\...\classes.dex
....................\...\net
....................\...\...\blogjava
....................\...\...\........\mobile
....................\...\...\........\......\ChangeWallpaperService.class
....................\...\...\........\......\Main.class
....................\...\...\........\......\R$attr.class
....................\...\...\........\......\R$drawable.class
....................\...\...\........\......\R$id.class
....................\...\...\........\......\R$layout.class
....................\...\...\........\......\R$raw.class
....................\...\...\........\......\R$string.class
....................\...\...\........\......\R.class
....................\...\resources.ap_
....................\default.properties
....................\gen
....................\...\net
....................\...\...\blogjava
....................\...\...\........\mobile
....................\...\...\........\......\R.java
....................\res
....................\...\drawable
....................\...\........\icon.png
....................\...\layout
....................\...\......\main.xml
....................\...\raw
....................\...\...\wp1.jpg
....................\...\...\wp2.jpg
....................\...\...\wp3.jpg
....................\...\...\wp4.jpg
....................\...\...\wp5.jpg
....................\...\values
....................\...\......\strings.xml
....................\src
....................\...\net
....................\...\...\blogjava
....................\...\...\........\mobile
....................\...\...\........\......\ChangeWallpaperService.java
....................\...\...\........\......\Main.java