Rename package in Android Studio

In Android Studio, you can do this:
For example, if you want to change com.example.app to my.awesome.game, then:
In your Project pane, click on the little gear icon ( Gears icon ) 
Uncheck the Compact Empty Middle Packages option

Shortcut : select the package and press shift + f6 then change the name whatever you want

 or 

follow the below steps:

• Your package directory will now be broken up into individual directories
• Individually select each directory you want to rename, and:
• Right-click it
• Select Refactor
• Click on Rename
• In the pop-up dialog, click on Rename Package instead of Rename Directory
• Enter the new name and hit Refactor
• Click Do Refactor in the bottom
• Allow a minute to let Android Studio update all changes
• Note: When renaming com in Android Studio, it might give a warning. In such case, select Rename All

• Now open your Gradle Build File (build.gradle - Usually app or mobile). Update the applicationId in the defaultConfig to your new Package Name and Sync Gradle, if it hasn't already been updated automatically.
• You may need to change the package= attribute in your manifest.
• Clean and Rebuild.