Control Unity Scenes with Android studio button click(Intents)...

"I imported a unity3d project having 3 scenes into android studio. I have 3 buttons in native and I need to Intent to corresponding scenes when I click buttons."

When I import unity3d project to android studio I can able to see only one scene.Where is another 2 scenes.

Is there any need to do 3 scenes as 3 project and combine it into one..?or can i do it as one project with two scene... Please help me..