title: Android support multiple screen
body: <p>I decompilated some android project, I want to get the resolution to
  support multiple screen size. I fonund in drawable folders, the add -v4 suffix such as drawable-hdpi-v4,drawable-hdpi-v4,what it mean? What problems can it resolve? 
  Then I was confused about screen support, if the same screen density
  but diffrent screen size,how can i support? i have two android
  devices,a resolution 480*845 and another 1024*600,but the screen
  density all 240, the too more space left in big one? How can I resolve this problem?</p>