what is a Android Project structure?

 Project Structure

The   Android build a system Make Specific Directory tree structure for your android project, same as Java project. 

• AndroidManifest.xml, an XML file describing the application being built and what Components—activities, services, etc.—are being supplied by that application.       
•   build.xml, an script for compiling the application and installing it on the device default. Properties, a property file used by the  build script.
• bin/ holds the application once it is compiled.
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•  libs/ holds any third-party Java JARs your application requires.
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• src/ holds the Java source code for the application. 
• res/ holds resources, such as icons, GUI layouts, and the like, that get packaged with              the compiled Java in the application. 
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• assets/ holds other static files you wish packaged with the application for deployment onto the device