Read USB dongle on your Nexus 7 without rooting

“USB On-The-Go is a specification that allows USB devices [such as the Nexus 7] to act as a host allowing other USB devices like a USB flash drive, [USB dongle card readers], mouse or keyboard to be attached to them.”

Source: Wikipedia

Since Google Nexus 7 doesn’t come standard with Micro SD Card slots to expand its storage capacity, being able to plug in your flash drives or USB memory card readers is the next best thing to having every other thing you want on your Nexus 7 without using the cloud services. And you can do this without having to root your Google Nexus 7.

Guide:

• Get a USB OTG cable
• Install the Nexus Media Importer app from Google Play – make sure your device is compatible.

Now once you have the cable and the app installed, simply plug the USB OTG cable onto your Nexus 7’s microUSB port and plug your USB Flash drive or mmc card reader on the other end. The Nexus Media Importer app will prompt you to launch the app and BAM you now have access to your files on your disk.