Alpha values to HEX for Android Material

The new thing from Google - Material - talks about alpha values for black and white ... so how to convert 87% to HEX? Thanks to this guy on stackoverlfow:

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
57% — 94
56% — 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
28% — 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
09% — 17
08% — 14
07% — 12
06% — 0f
05% — 0d
04% — 0a
03% — 08
02% — 05
01% — 03
00% — 00

Android EditText - hide soft keyboard on focus but keep cursor visible

In my current android app I have a lot of input fields (EditText) and I need to disable the soft keyboard on focus, because I use my own kind of input widget.

I've try several solutions, but on some was the cursor not visible or the soft keyboard was blinking on focus for some ms. But this one works:

    public static void disableSoftKeyboard(final EditText v) {
        if (Build.VERSION.SDK_INT >= 11) {
            v.setRawInputType(InputType.TYPE_CLASS_TEXT);
            v.setTextIsSelectable(true);
        } else {
            v.setRawInputType(InputType.TYPE_NULL);
            v.setFocusable(true);
        }
    }

Disable FTP Server (proftpd) in Plesk

I don't need proftpd on my root server, I use sftp, so:

vi /etc/xinetd.d/ftp_psa

change

disable         = no

to 

disable         = yes

How to kill all cron jobs

kill $(pgrep cron)

BTW f.e.
kill $(pgrep php)
works as well

Delete empty mails from maildrop

I don't know why I have a bunch of empty mails on maildrop folder of postfix, but ...

find /var/spool/postfix/maildrop/ -size 0 -name '*' -exec rm {} +

Postfix. Delete some mails from the queue

Change "123@example" to something you need ...

mailq|grep '123@example'|awk {'print $1'}|grep -v "(host"|tr -d '*!'|postsuper -d -

PHP session timeout cookie lifetime

There are many ways to set cookie based session timeout in PHP. You can edit your php.ini or put it in .htaccess but I choose for today this piece of code:

<?php
ini_set('session.gc_maxlifetime', 172800);
ini_set('session.cookie_lifetime', 172800);
session_start();
?>

The session above will be valid for 2 days.