I'm new in android, and I want to import the jfftpack to my project in android studio anda i don't know how to import it.
The original code was import ca.uol.aig.realdoublefft and I'don't know where to put the java files. I've tried to put them to a libs folder.
here's the jfftpack source code:
If it's an existing code library, I'd recommend adding a module for it. Probably the easiest way is to use the File menu command to add a new module, let it create a plain Java (non-Android) module for you, remove the sample class it puts into the module, and then copy your files over into it and tweak it. The module wizard will take care of setting up the directories and build files for you, and you can look at it later and see what did.
Without pressing Alt + enter to import the Packages?
There is some steps like 1)File --->Settings --from left pane we find editor---->General--->Auto Import
There Insert imports on paste as ALL not ask
And put check mark for all the Above three Fields
1)Show import popup
2)Optimize the imports on fly
3)Add unambiguous imports on the fly
Click Apply and ok
Happy Coding......
If you have the sources import them in the src folder. Is the simple thing that you can do.
I suggest you to use the command line rather than Android Studio interface. If you work on Linux or MacOS, try to copy the package to your working direcotry like:
cp -r PACKAGE_NAME PATH_TO/AndroidStudioProjects/PROJECT_NAME/app/src/main/java/
来源：https://stackoverflow.com/questions/20179181/how-to-import-a-java-package-in-android-studio