I want to know is there any way to use the input of an external camera connected with android tablet using USB into my application that is running on that tablet.
I would suggest you to try this one
android-webcam
Also this will be helpful to you
developer.android.com/guide/topics/connectivity/usb/accessory.html
I've succeeded to get this project to work with my webcame connected to my Android tablet: https://github.com/saki4510t/UVCCamera.
However, the issue is that it relies on native libraries and comes with many samples undocumented. I am myself still looking for better ways.
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