Sony not detected on ADT

Configure the cellphone

1. Go to Settings -> Xperia -> Connectivity
• Select the option Install PC Companion, this option will install the drivers
• Select the option Usb connetion mode
• In my case work with Media transfer mode (MTP) that is the default option
• The recommendations establish change to Mass storage mode (MSC)
• Restart the computer
• Restart the ADT

Review if you have the drivers installed (Windows)

1. Open a explorer
2. Right click on Computer
• Select Manage
3. Select Device Manager on left menu 
• Select Portable Devices
• Review if you have installed the drivers