问题
I'm having problems with an app on the Samsung S I9000. The buttons on my app are much larger than they should be. In addition, the system is selecting res/values-small/ as a source of values. All in all, it's acting as if the device has a very tiny screen, even though it's supposedly 800x480 (I'm working in landscape mode). In fact, I can improve the situation by changing the values in res/values-small/styles.xml to even smaller font sizes than I was already using.
Display metrics are as follows:
density = 2.0
scaledDensity = 2.0
densityDpi = 320
widthPixels = 800
heightPixels = 480
xdpi = 320.0
ydpi = 320.0
Can anybody explain why the device is scaling my graphics up so much and acting as if I have an extremely small display? More importantly, how do I fix it?
I've tried tweaking my manifest to set minSdk and targetSdk to a recent release, but that had no effect. Deleting values-small/ caused the app to use the default values/ instead, which only made the situation worse.
回答1:
Always use "sp" for font and rest as "dp"
place your image in corresponding folder as below
suppose your are using 36x36 image in for mdpi you need to use
drawable-mdpi - 36 x 36
drawable-hdpi - 48 x 48
drawable-xhdpi 72 x 72
3:4:6:8 ratio
There are some situations in which you might not want Android to pre-scale a resource. The easiest way to avoid pre-scaling is to put the resource in a resource directory with the nodpi configuration qualifier.
For example:
res/drawable-nodpi/icon.png
for example
you are using an font size as 14sp means it will automatically change for 320 DPI as
14×320÷160 =28
so now your font size is 28dp for xhdpi resolution phone.
来源：https://stackoverflow.com/questions/9529501/android-samsung-s-i9000-screen-size-and-density-issues