本文探讨了屏幕坐标（screencoordinate）与设备坐标（devicecoordinate）的区别及转换方法。屏幕坐标随屏幕旋转变化，而设备坐标固定不变。文中还介绍了校准数学公式用于计算坐标转换参数，并提及了Android系统中实现这些功能的具体文件。
screen coordinate(Xs) VS device coordinate(Xd)
screen coordinate is related to screen rotation, which could be change after orietation. But device coordinate is fixed, left up is original point.
Xs = Xd*A+Yd*B+C
Ys = Yd*D+Yd*E+F
Calibrate math is aiming to compute out A/B/C/D/E/F value, which saved in /etc/ts/pointercal file.Android has no calibrate math method, which done by tslib.
Porting to gingerbread: tscalibrate.java, tsBootReceiver.java, res/values/strings.xml, AndroidManifest.xml, res/xml/setting.xml, *.png resources in drawable-mdpi/drawable-hdpi.
Intent PRE_BOOT_COMPLETED, this broadcast is sent after the core system has finished booting, before the home app is launched or BOOT_COMPLETED is sent.
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