[Android] Third-party library

對一個開放式的作業系統，必須要了解如何在程式中加入網路上Third-party 所開發的library,即可大幅節省開發時間.
通常會提供 *.jar的library方式讓開發者下載與加入專案,請遵照下列方式即可:

• Copy this .jar file.
  
• In Eclipse, create a new folder directly underneath the main application folder (where src and gen are). Name the folder "lib" without the " ".
  
• Right click this new folder, and paste the .jar file.
  
• The library is now part of your project, but you must add it to the build path before you reference it.
  
• Still in Eclipse, right click the .jar you added and select the "Build Path -- Add to Build Path" option.
  
• It will now show up under Referenced Libraries. You are all set!