android颜色透明度百分比

透明度对应16进度值如下:

透明度	16进制值
100%	FF
99%	FC
98%	FA
97%	F7
96%	F5
95%	F2
94%	F0
93%	ED
92%	EB
91%	E8
90%	E6
89%	E3
88%	E0
87%	DE
86%	DB
85%	D9
84%	D6
83%	D4
82%	D1
81%	CF
80%	CC
79%	C9
78%	C7
77%	C4
76%	C2
75%	BF
74%	BD
73%	BA
72%	B8
71%	B5
70%	B3
69%	B0
68%	AD
67%	AB
66%	A8
65%	A6
64%	A3
63%	A1
62%	9E
61%	9C
60%	99
59%	96
58%	94
57%	91
56%	8F
55%	8C
54%	8A
53%	87
52%	85
51%	82
50%	80
49%	7D
48%	7A
47%	78
46%	75
45%	73
44%	70
43%	6E
42%	6B
41%	69
40%	66
39%	63
38%	61
37%	5E
36%	5C
35%	59
34%	57
33%	54
32%	52
31%	4F
30%	4D
29%	4A
28%	47
27%	45
26%	42
25%	40
24%	3D
23%	3B
22%	38
21%	36
20%	33
19%	30
18%	2E
17%	2B
16%	29
15%	26
14%	24
13%	21
12%	1F
11%	1C
10%	1A
9%	17
8%	14
7%	12
6%	0F
5%	0D
4%	0A
3%	08
2%	05
1%	03
0%	00

透明度百分比计算方法

public void rgba() throws Exception {
        System.out.println("透明度 | 十六进制值");
        System.out.println("---- | ----");
        for (double i = 1; i >= 0; i -= 0.01) {
            i = Math.round(i * 100) / 100.0d;
            int alpha = (int) Math.round(i * 255);
            String hex = Integer.toHexString(alpha).toUpperCase();
            if (hex.length() == 1) hex = "0" + hex;
            int percent = (int) (i * 100);
            System.out.println(String.format("%d%% | %s", percent, hex));
        }
    }