1 import android.content.Context;
 2 import android.util.TypedValue;
 3
 4 // 常用单位转换的辅助类
 5 public class DensityUtils
 6 {
 7     private DensityUtils()
 8     {
 9         /* cannot be instantiated */
10         throw new UnsupportedOperationException("cannot be instantiated");
11     }
12
13     /**
14      * dp 转 px
15      *
16      * @param context
17      * @param val
18      * @return
19      */
20     public static int dp2px(Context context, float dpVal)
21     {
22         return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
23                 dpVal, context.getResources().getDisplayMetrics());
24     }
25
26     /**
27      * sp 转 px
28      *
29      * @param context
30      * @param val
31      * @return
32      */
33     public static int sp2px(Context context, float spVal)
34     {
35         return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
36                 spVal, context.getResources().getDisplayMetrics());
37     }
38
39     /**
40      * px 转 dp
41      *
42      * @param context
43      * @param pxVal
44      * @return
45      */
46     public static float px2dp(Context context, float pxVal)
47     {
48         final float scale = context.getResources().getDisplayMetrics().density;
49         return (pxVal / scale);
50     }
51
52     /**
53      * px 转 sp
54      *
55      * @param fontScale
56      * @param pxVal
57      * @return
58      */
59     public static float px2sp(Context context, float pxVal)
60     {
61         return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
62     }
63
64 }