Some notes about Android Development. I have taken “CSE 476 Mobile Application Development” at MSU, but to avoid leaking course materials, I will just keep them in my mind HOPEFULLY.
Basic Java
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JNI: Java Native Interface, which is a feature of Java，making Jave interacts with other programming languages; For example, Java calls C++; C++ calls Java.
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NDK: Native Development Kit, which helps to develop C++ dynamic library and automatically package shared libraries and applications into APKs．
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Android.mk formulates the configuration information for source code compilation, and Application.mk configures the relevant content of the compilation platform;
Sensors
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Location: longitude, latitude, and altitude
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Accelerometer: gravity and linear accelerometer
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Gyroscope: measuring the rotation speed of the device, mostly required for games like 3D racing
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Proximity: check whether there is some obstacle at a very close distance to your device.
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Orientation: magnetic field force in 3-axis space, z is related to the magnetic north pole(0 means the top of your phone points to the north pole), x is related to the ground (90 means the phone is standing vertically), y shows roll (0 means the phone is facing to the sky, 180 means the screen is facing the ground).