Do check out Android UI guidelines and their notion of Applications, Activities & Tasks
Do read Hello World as well
Install Eclipse IDE, Android SDK Plugin for Eclipse
Here are some rough notes:
All images should be placed under Res > Drawable.
If multiple devices and resolutions are targetted, images should be placed in the corresponding hi/low/med dpi folders.
Layout is specified under Res > Layout
Manifest is an important config file that should not be renamed.
Application tag is used to specify that this is an application and not a service.
App name is set here
“Android: Icon” sends pointer to the the app icon, which should be placed in the Drawables under Resources
Pre-defined category “launcher” is used to launch the app when the app icon gets clicked.
Layouts may contain views and sub views.