Alright, I've done some searching and seem to be coming close to the answer I'm looking for. But for fear of messing something up with my current project (I'm a first time app developer and I'm quite pleased so far... I'd like to stay that way), I'm looking for a nice and clear step by step on how to copy a project. I know some things in certain places need to be imported/renamed but I'm not sure exactly what/where.
So, is there a good step by step on how to do this or am I missing it? If not, can someone explain it to me in detail?
EDIT: I want to copy one app project to make another app project that's very similar. I'm using Android Studio for my apps. I want to be able to use one app to make another that's just like it (with differences of course). So instead of making a new project and making all the xml/java files and adding all the images, etc. I want to be able to use what I already have and duplicate it to make another app that's totally separate from the original. I'm not using Eclipse at all, I'm using Android Studio for my apps.
I'm a newcomer to Android and AndroidStudio (AS) and I've laboured for many hours trying to use AS to 'clone' a project. Many thanks for the existing answers given above that set me on the right path. For any total newbie's, like myself, the following detailed step-by-step instructions should prove useful:
Using Windows Explorer, navigate to the Android Studio projects directory select the project folder to be cloned;
Copy the selected folder;
Paste the folder into the Android Studio (AS) projects directory;
Rename the pasted folder to be the new name of the cloned project, say 'ViewPager_Shell';
Launch Android Studio;
Select 'Open an existing Android Studio project';
Navigate to the AS projects directory;
Select the folder 'ViewPager_Shell';
Ensure that AS's explorer pane is visible on the left-hand-side of the AS main frame;
Select the 'Android' view for the explorer pane;
Open app -> java; the old package name should now be visible, e.g. 'com.hulme.owm';
Right-click on the old package name and select 'Refactor -> Rename';
A dialog should now appear; left-click 'Rename Package';
In the pop-up dialog, replace the old package (e.g. 'owm') with the new package name (e.g. viewpager_shell);
Left-click on the 'Refactor' button; BEWARE!! ... A new 'Find Factoring Preview' pane should open in the lower-left of the AS main frame window;
Select 'Do Refactor';
Using the AS explorer pane, navigate to 'Gradle Scripts -> build.gradle(Module:app);
Double-click build.gradle(Module:app) to view its contents in the AS editor pane;
Change the defaultConfig 'applicationID' string to your new full package path (e.g. "com.hulme.viewpager_shell");
Using the AS explorer pane, navigate to 'app -> manifests -> AndroidManifest.xml';
Double-click on 'AndroidManifest.xml' to view it in the AS editor pane;
Under the manifest tag, you should observe that the new package name (e.g. 'com.hulme.viewpager_shell') now appears, as a result of the previous refactoring step;
Under application tag, change android:label to a new name (e.g. "ViewPager Shell Demo") - this is the name that appears in the list of installed apps provided by Android's 'Settings -> Application manager;
Under activity tag, change android:label to a new name (e.g. "VP Shell") - this is the name that appears under the app's icon and it is also the activity's default ActionBar title;
You should now be able to build and run the newly cloned project.