How to generate Class Diagram (UML) on Android Studio (IntelliJ Idea)

I have managed to to do it in a way. Perform all the steps as referenced by Michal Rowicki above.

1. Open Visual Paradigm software.
2. Create a new Project
3. There would be an option on the Tools bar above that states Code and select Instant Reverse... from the drop down menu with Java language(or other)
4. Select your application folder where your project is located and add it to the project(i have selected the complete folder application)
5. The application should now appear on the left pane in Class Repository
6. Then all you do is right click the project that you have added and select Reverse to new class diagram
7. Select either you wish to have the packages included in the class diagram or just the class diagram of the project

Then it should appear on your screen and customize it as you wish

However i do not know if the plugin in Android Studio was necessary nevertheless it has worked in a way for me.

For those who want to use simpleUML in Android Studio and having issues in running SimpleUML.

First download simpleUML jar from here https://plugins.jetbrains.com/plugin/4946-simpleumlce

Now follow the below steps.

Step 1:

Click on File and go to Settings (File → Settings)

Step 2

Select Plugins from Left Panel and click Install plugin from disk

Step 3:

Locate the SimpleUML jar file and select it.

Step 4:

Now Restart Android Studio (File → Invalidate Caches/Restart → Just Restart)

Step 5:

After you restart Right Click the Package name and Select New Diagram or Add to simpleUML Diagram → New Diagram.

Step 6:

Set a file name and create UML file. I created with name NewDiagram

Step 7:

Now Right Click the Package name and Select the file you created. In my case it was NewDiagram

Step 8:

All files are stacked on top of one another. You can just drag and drop them and set a hierarchy.

Like this below, you can drag these classes

I found a free plugin that can generate class diagrams with android studio. It's called SimpleUML.

Update Android Studio 2.2+: To install the plugin, follow steps in this answer: https://stackoverflow.com/a/36823007/1245894

Older version of Android Studio On Mac: go to Android Studio -> Preferences -> Plugins

On Windows: go to Android Studio -> File -> Settings -> Plugins

Click on Browse repositories... and search for SimpleUMLCE (CE means Community Edition, this is what android studio is based on).

Install it, restart, then you can do a right click on the folder containing the classes you want to visualize, and select Add to simpleUML Diagram.

That's it; you have you fancy class diagram generated from your code!