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On a growing scale the authors use mobile phones for diverse activities in their daily life, such as entertainment, education or information purposes. The main objective of the project is to develop an android application to track the user physical activity and estimate his energy expenditure using 3axis accelerometer and GPS in a smart phone with android operating system. To implement this system, an android application was developed to collect accelerometer data, feature extraction, activity recognition and calorie estimation in android SDK. Here the users performed activities such as running, Cycling, walking etc by keeping the phone in the pants pocket and then are classified user activities on the basis of frequency component present in the acceleration data.
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