ANDROID-SDK under directory structure

-"Add-ons: This directory contains additional functional systems developed by third-party companies for Android platforms, which are empty when just unzipped

-"Platforms: This directory contains different versions of the Android system. The directory is empty when you just unlocked it

-"Tools: This directory contains a lot of Android development, debugging tool

-"AVD Manager.exe: This program is an AVD (Android virtual Appliance) Manager that allows you to manage AVD

-"SDK Manager.exe: This program is the Android SDK Manager, this tool can manage the Android SDK

　　The Android document, SDK platform is required, if you want to see the Android official sample program, using the Android SDK source code, you can check the "Sample for SDK" and "Sources for Android SDK"

　　After the installation is complete, you can see the following folders added to the Android SDK directory:

-"Docs: This folder contains the Android SDK development files and API documentation, etc.

-"Extras: This folder contains the USB driver provided by Google, and Intel provides hardware acceleration and other additional kits

-"Platform-tools: This folder contains Android platform related tools

-"Samples: This folder contains a sample program for different Android platforms

-"Sources: This file holds the Android source code

　To use the various tools of the Android SDK for command line windows, it is recommended that you add the tools subdirectory, Platforms-tools subdirectory, in the Android SDK directory to the system's PATH environment variable

ANDROID-SDK under directory structure