Any modern mobile phone is equipped with accelerometer and compass sensor. Many techniques is developed to use the ease of phone sensors for indoor tracking. Using accelerometer to estimate the walking distance, using compass to detect heading direction.
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During my first period internship at Greengar, my task is to port an iOS game to Android platform. At first, it’s not an easy task for me because I had no experience with programming game and I really hate coding GUI for game. It’s a heavy task and took a lot of time. Luckily, before my internship began, there was another intern that working on that project. He already had a solution for GUI, using Andengine library. It’s developed by a guy from Android engineer of Google, as I know so.
This is the third semester of my junior year and I study programming in Android for my OS course. Android is new, plus this is the first time I do emulator programming 
Everything was fine until the T.A announced the first project named “Sudoku”. After only 3 lab sessions, they gave a big game project to students. Luckily, I found the ebook “Hello, Android 2nd”, an essential ebook for beginning with Android. Again, Google helps me a lot.
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