Android: How to call Camera [duplicate]

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http://stackoverflow.com – Right now I was asked to create a simple application in which a person can take a photo. And that photo will be saved to a particular folder and that folder cannot be accessed by the main gallery. Only that application can access the folder and see the pictures. My question is, how do you add or call the Camera in the application? What are the steps in taking a photo, capturing a photo, saving it in a folder, and how to stop a photo from saving (like cancel the saving). (HowTos)