Fully change package name including company domain

current package : com.company.name

New package : com.mycomapny.name

Steps:1) Suppose you are at this screen which is shown below.

2) Open project pane and click on settings icon.

3) Deselect Compact Empty Middle Packages.

4) Then your package is now broken into individual parts as shown below .

5) right click on "company" select Refactor -> select rename ->rename directory.

6) Now your "company" has been changed to new "mycomapny" and changes were reflected as shown in below figure.

7) Now change the package name in AndroidManifest.xml file .

8) Open app level build.gradle and change package name .

9) you will get errors as Cannot resolve symbol "R" .

10) Remove line which gives this error and studio will import new R file automatically.

11) If you have multiple files then use find and replace option by pressing " Cntrl+Shift+R "

Or " Select Edit->Find->Replace in path.."

12) select Replace All.

You can do this:

Change the package name manually in the manifest file.Click on your R.java class and the press F6 (Refactor->Move...). It will allow you to move the class to other package, and all references to that class will be updated.

reference: How do I rename the android package name?

This worked for me, from https://stackoverflow.com/a/18637004/127434

Another good method is: First create a new package with the desired name by right clicking on the java folder -> new -> package.

Then, select and drag all your classes to the new package. AndroidStudio will refactor the package name everywhere.

Finally, delete the old package.