android不同屏幕之間像素和dip的轉換比例是不一樣的：

2 px = 3 dip if dpi == 80(ldpi), 320x240 screen
1 px = 1 dip if dpi == 160(mdpi), 480x320 screen
3 px = 2 dip if dpi == 240(hdpi), 840x480

方法：

1. // dip轉像素
2. public int DipToPixels(Context context, int dip) {
3. final float SCALE = context.getResources().getDisplayMetrics().density;
5. float valueDips = dip;
6. int valuePixels = (int) (valueDips * SCALE + 0.5f);
8. return valuePixels;
10. }
12. // 像素轉dip
13. public float PixelsToDip(Context context, int Pixels) {
14. final float SCALE = context.getResources().getDisplayMetrics().density;
16. float dips = Pixels / SCALE;
18. return dips;
20. }

002.像素和dip之間的相互轉換