What density should I keep when i’m designing at 3x for an android mobile app in photoshop? [duplicate]

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I've designed a mobile app design for couple of project, but still i couldn't understand the DPI concept.

I using photoshop for designing. Im doing design with the dimension of 1080*1920 - which is (3x - I guess i'm right) and with the density of 72. Is this right way of initializing a canvas size and density?

Could anybody guide me?