I am using Android studio and I want to add module to my project like \"action bar Sherlock\" or jar files, but when I opened the project structure there is no module or lib
You need to add a gradle.settings file to your root project structure, after that when you "Open Module settings" you will the menu aligned to your gradle.settings. When importing a project to Android Studio, it doesn't create this file for you. Sometimes it's usually better to start a clean project and move your code there, it's usually easier to achieve.