Android学习笔记-屏幕适配

1. layout ，drawable 根据文件夹的命名系统查找资源。类似：
   layout/
   用于横向，layout-port/
   用于纵向

2. 资源大小

   res/
   drawable-xhdpi/
        awesomeimage.png
    drawable-hdpi/
        awesomeimage.png
    drawable-mdpi/
        awesomeimage.png
    drawable-ldpi/
        awesomeimage.png
   

各个屏幕的比例比

xhdpi: 2.0
hdpi: 1.5
mdpi: 1.0 (baseline)  
ldpi: 0.75

ldpi (low) ~120dpi
mdpi (medium) ~160dpi
hdpi (high) ~240dpi
xhdpi (extra-high) ~320dpi
xxhdpi (extra-extra-high) ~480dpi
xxxhdpi (extra-extra-extra-high) ~640dpi

xlarge* screens are at least 960dp x 720dp
large* screens are at least 640dp x 480dp
normal* screens are at least 470dp x 320dp
small* screens are at least 426dp x 320dp