App Inventor, released by Google a year ago, is a visual development software for the Android platform. App Inventor lets you develop mobile applications for Android phones using a web browser and either a connected phone or emulator. The App Inventor servers store your work and help you keep track of your projects. The best part of App Inventor is that you can create Android applications with just few drags and drops and no need to learn Java or type one line of code. I think App Inventor is a great tool for teachers and students who want to create mobile apps for their Android phones. There are plenty of tutorials and samples to help set up your system and start building the first app. Here are few videos about App Inventor:
An introduction to App Inventor
App Inventor in Action
App Inventor at University of San Francisco
Creating SMS Texting Apps with App Inventor
Learning Technologies
It is helpful to review most of the tutorials to get more information on the Google app inventor. The best tool to create free android applications without no programming knowledge.
軟體的使用上採用物件式的操作，
讓使用者的學習更簡便容易。