A free app for Android, by RupiApps.
This app will allow you to connect your DSLR with your phone via USB or Wi-Fi. It will also allow you to connect your Chromecast and share the pictures you are shooting directly with other people (tethered shooting).
It's free, simple to use, and will make you enjoy taking pictures more than ever. It will also let you see your captured images in a nice grid.
What's more, the app comes with a lot of support. So, if you have any problems, the developers can help you.
This app is also a powerful one. So, if you want to use it to take full advantage of your camera, you can do so.