If you recently started to develop applications for the Android platform (or any other mobile platform) it is likely that you will encounter the problem of designing user interfaces. Have you realized the importance of ListView control in developing android applications? That is what I learned the hard way. Don't allow this to happen to you too.
Script for creating Android icons for different screen resolutions at once. Icons can be saved using standard Android icons naming conventions and saved in appropriate folders.
Source code with examples how to use relative layout to create nice buttons with text and images in Android
Tutorial about connecting to the web pages on the Internet from Android application, using both POST and GET web requests.