Android 界面适配

关于屏幕的适配
http://www.zcool.com.cn/article/ZNjI3NDQ=.html
pt 约等于 2.22sp 字体的适配 http://blog.csdn.net/shizhu_1010/article/details/8089510
one DIP is one pixel on an approximately 160 dpi screen --- 官方文档
据px = dip * density / 160，则当屏幕密度为160时，px = dip http://www.cnblogs.com/greatverve/archive/2011/12/28/android-dip-dp-sp-pt-px.html http://www.cnblogs.com/error404/p/3815739.html
px和dp之间的转换 http://blog.csdn.net/arui319/article/details/6777133
总结得出：

px = dp*ppi/160
dp = px / (ppi / 160)

px = sp*ppi/160
sp = px / (ppi / 160)

dp = sp?