Hello your explanation is awesome man 
... i am developing a mobile app as i am a beginner ... i am designing my app in eclipse with android 2.1 platform and i wanted to design an app and my first page which has a button name "scan code" and after clicking that button i want that the camera should automatically open and after i snap a picture of qr code it will be able to read that qr code and must redirect me to the specific website of the qr code ... i have no idea how to write code or how many xml or java files will be used in it ... can please you help me out and explain this process to me ... what files should i make and what codes will be used for implementing this application ... please can you help me out ... it will be a great help
... i am developing a mobile app as i am a beginner ... i am designing my app in eclipse with android 2.1 platform and i wanted to design an app and my first page which has a button name "scan code" and after clicking that button i want that the camera should automatically open and after i snap a picture of qr code it will be able to read that qr code and must redirect me to the specific website of the qr code ... i have no idea how to write code or how many xml or java files will be used in it ... can please you help me out and explain this process to me ... what files should i make and what codes will be used for implementing this application ... please can you help me out ... it will be a great help