Learn to write Android applications. Learn the basics of working with resources, layouts, the AndroidManifest.xml file and building code.

Accessing files with Java is easy. With this easy to follow tutorial you will learn how to perform basic file operations in Java. Reading, writing, appending, and random file access are covered. Along with an introduction to file locking.

Use javascript to validate form fields. By checking values with javascript prior to submitting forms to your server you can cut down on server load. Topics covered include retrieving the values of form fields, validating email addresses, and using regular expression testing to validate forms.