Based on the latest documentation of Phonegap 3.5.0,
http://docs.phonegap.com/en/3.5.0/config_ref_images.md.html
First, you need to add splashscreen plugin. Using your CLI, go to your project directory and do this :
cordova plugin add org.apache.cordova.splashscreen
After that, add this to config.xml in the root destination or in www/config.xml(old version)
<preference name="SplashScreen" value="screen" />
<preference name="SplashScreenDelay" value="10000" />
and place your splash screen file to the corresponding drawable folder according to size, like you just did. Make sure the file name is same with the one with the "value" parameter.
Next, browse to
platform/android/ant-build
and delete all the files inside it (most important step).
Last but not least, build and run your phonegap project.
Now it will use the new splash screen file.
It seems like the ant-build is not updating itself.