Recently, LinkedIn has updated it's app where you have an ability to personalize an invitation to connect and it has also an awesome User Interface.
How to send a personalize LinkedIn invite from your Android
1. Go the profile of the person you wish to invite.
2. Click on the 3 dot pattern at the top right of the profile screen and the below screen appears.
3. Now you can send create and send personalize invite (Noe that it has a limit of 300 Character)
Here is the link to upgrade your LinkedIn app (Android User)
Additional Information on LinkedIn app Update :
Happy Networking !!