Color Transparency in Android

Hex Opacity Values

100% — FF
95% — F2
90% — E6
85% — D9
80% — CC
75% — BF
70% — B3
65% — A6
60% — 99
55% — 8C
50% — 80
45% — 73
40% — 66
35% — 59
30% — 4D
25% — 40
20% — 33
15% — 26
10% — 1A
5% — 0D
0% — 00


For Ex:

Let's say you have a black color and you want to apply a 80% opacity on it.

Black - #000000

80% opacity - CC

Format: 

Opacity + Color

It would be:

#CC000000

Android - BroadcastReceiver when wifi or 3g network state changed

You need to set a permissions on android manifest

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

Set up your receiver

<receiver android:name=".NetworkChangeReceiver" >

            <intent-filter>

                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />

            </intent-filter>

</receiver>

Receiver code

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

import android.util.Log;

public class NetworkChangeReceiver extends BroadcastReceiver {

    @Override

    public void onReceive(Context context, Intent intent) {

    ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo wifi = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

        NetworkInfo mobile = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

        boolean isConnected = wifi != null && wifi.isConnectedOrConnecting() || mobile != null && mobile.isConnectedOrConnecting(); 

        if (isConnected) {

            Log.d("Network Available ", "YES");

        }else{

           Log.d("Network Available ", "NO");

        }

    }

}

Convert binary image to image file

String strBinary = "binary data";
byte[] imageBytes= Base64.decodeBase64(strBinary.getBytes());
InputStream in = new ByteArrayInputStream(imageBytes);
Bitmap b = BitmapFactory.decodeStream(in);

Rails 1.9.2 , Carrierwave and RMagick Problem (Segmentation fault)

If you are homebrew users:
brew install -f imagemagick --disable-openmp

Note:
If you have imagemagick installed already, you need to remove it before you do the code above:

brew remove imagemagick
rm -rf `brew --cache imagemagick`


The following codes are the problem logs.

config.ru:229: [BUG] Segmentation fault
ruby 1.9.1p376 (2009-12-07 revision 26041) [i386-darwin10.3.0]

-- control frame ----------
c:0042 p:---- s:0196 b:0196 l:000195 d:000195 CFUNC :read
c:0041 p:0121 s:0192 b:0192 l:001ab8 d:000191 LAMBDA config.ru:229
c:0040 p:---- s:0189 b:0189 l:000188 d:000188 FINISH
c:0039 p:---- s:0187 b:0187 l:000186 d:000186 CFUNC :call
c:0038 p:0018 s:0184 b:0184 l:001d78 d:000183 BLOCK /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:865
c:0037 p:---- s:0182 b:0182 l:000181 d:000181 FINISH
c:0036 p:---- s:0180 b:0180 l:000179 d:000179 CFUNC :instance_eval
c:0035 p:0016 s:0177 b:0175 l:000174 d:000174 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:521
c:0034 p:0024 s:0171 b:0171 l:000148 d:000170 BLOCK /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:500
c:0033 p:---- s:0169 b:0169 l:000168 d:000168 FINISH
c:0032 p:---- s:0167 b:0167 l:000166 d:000166 CFUNC :catch
c:0031 p:0140 s:0163 b:0163 l:000148 d:000162 BLOCK /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:497
c:0030 p:---- s:0154 b:0154 l:000153 d:000153 FINISH
c:0029 p:---- s:0152 b:0152 l:000151 d:000151 CFUNC :each
c:0028 p:0073 s:0149 b:0149 l:000148 d:000148 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:476
c:0027 p:0076 s:0141 b:0141 l:000140 d:000140 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:601
c:0026 p:0009 s:0137 b:0137 l:000138 d:000136 BLOCK /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:411
c:0025 p:---- s:0135 b:0135 l:000134 d:000134 FINISH
c:0024 p:---- s:0133 b:0133 l:000132 d:000132 CFUNC :instance_eval
c:0023 p:0012 s:0130 b:0130 l:000121 d:000129 BLOCK /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:566
c:0022 p:---- s:0128 b:0128 l:000127 d:000127 FINISH
c:0021 p:---- s:0126 b:0126 l:000125 d:000125 CFUNC :catch
c:0020 p:0013 s:0122 b:0122 l:000121 d:000121 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:566
c:0019 p:0098 s:0115 b:0115 l:000138 d:000138 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:411
c:0018 p:0019 s:0108 b:0108 l:000107 d:000107 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:399
c:0017 p:0014 s:0104 b:0104 l:000103 d:000103 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/showexceptions.rb:24
c:0016 p:0150 s:0098 b:0098 l:000097 d:000097 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/methodoverride.rb:24
c:0015 p:0031 s:0092 b:0092 l:000091 d:000091 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/commonlogger.rb:18
c:0014 p:0018 s:0084 b:0084 l:002080 d:000083 BLOCK /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:979
c:0013 p:0032 s:0082 b:0082 l:000081 d:000081 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:1005
c:0012 p:0011 s:0078 b:0078 l:002080 d:002080 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:979
c:0011 p:0100 s:0074 b:0074 l:000ff0 d:000ff0 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/lint.rb:47
c:0010 p:0022 s:0068 b:0068 l:000067 d:000067 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/lint.rb:35
c:0009 p:0014 s:0064 b:0064 l:000063 d:000063 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/showexceptions.rb:24
c:0008 p:0031 s:0058 b:0058 l:000057 d:000057 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/commonlogger.rb:18
c:0007 p:0014 s:0050 b:0050 l:000049 d:000049 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/content_length.rb:13
c:0006 p:0320 s:0042 b:0042 l:000041 d:000041 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/handler/webrick.rb:48
c:0005 p:0256 s:0030 b:0030 l:000029 d:000029 METHOD /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:111
c:0004 p:0382 s:0020 b:0020 l:000019 d:000019 METHOD /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70
c:0003 p:0123 s:0009 b:0009 l:000bc8 d:000008 BLOCK /usr/local/lib/ruby/1.9.1/webrick/server.rb:183
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:---- s:0002 b:0002 l:000001 d:000001 TOP
---------------------------
-- Ruby level backtrace information-----------------------------------------
config.ru:229:in `read'
config.ru:229:in `block (2 levels) in

'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `block in route'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `instance_eval'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `route_eval'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:500:in `block (2 levels) in route!'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `catch'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `block in route!'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `each'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `route!'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:601:in `dispatch!'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `block in call!'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `instance_eval'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `block in invoke'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `catch'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:399:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/showexceptions.rb:24:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/methodoverride.rb:24:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/commonlogger.rb:18:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `block in call'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in `synchronize'
/usr/local/lib/ruby/gems/1.9.1/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/lint.rb:47:in `_call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/lint.rb:35:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/showexceptions.rb:24:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/commonlogger.rb:18:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/content_length.rb:13:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.1.0/lib/rack/handler/webrick.rb:48:in `service'
/usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
/usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
/usr/local/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

-- C level backtrace information -------------------------------------------
0x10010cd8d 0 libruby.dylib 0x000000010010cd8d rb_vm_bugreport + 77
0x10002b184 1 libruby.dylib 0x000000010002b184 report_bug + 260
0x10002b318 2 libruby.dylib 0x000000010002b318 rb_bug + 200
0x1000b7124 3 libruby.dylib 0x00000001000b7124 sigsegv + 132
0x7fff8301c80a 4 libSystem.B.dylib 0x00007fff8301c80a _sigtramp + 26
0x1032313ac 5 libMagickCore.3.dylib 0x00000001032313ac Splay + 300
0x103119245 6 libMagickCore.3.dylib 0x0000000103119245 AcquirePixelCache + 325
0x1031cb317 7 libMagickCore.3.dylib 0x00000001031cb317 AcquireImage + 375
0x10333035b 8 libMagickCore.3.dylib 0x000000010333035b ReadPNGImage + 155
0x1031418fd 9 libMagickCore.3.dylib 0x00000001031418fd ReadImage + 2221
0x101f1b72b 10 RMagick2.bundle 0x0000000101f1b72b rd_image + 339
0x101f1b59b 11 RMagick2.bundle 0x0000000101f1b59b Image_read + 36
0x1000fd0e4 12 libruby.dylib 0x00000001000fd0e4 vm_call_cfunc + 340
0x1000fe9b0 13 libruby.dylib 0x00000001000fe9b0 vm_call_method + 896
0x1000ff8fc 14 libruby.dylib 0x00000001000ff8fc vm_exec_core + 3180
0x100104b93 15 libruby.dylib 0x0000000100104b93 vm_exec + 1203
0x100106643 16 libruby.dylib 0x0000000100106643 rb_vm_invoke_proc + 691
0x100106ccd 17 libruby.dylib 0x0000000100106ccd vm_call0 + 1085
0x1000317c6 18 libruby.dylib 0x00000001000317c6 rb_method_call + 406
0x1000fd0e4 19 libruby.dylib 0x00000001000fd0e4 vm_call_cfunc + 340
0x1000fe9b0 20 libruby.dylib 0x00000001000fe9b0 vm_call_method + 896
0x1000ff8fc 21 libruby.dylib 0x00000001000ff8fc vm_exec_core + 3180
0x100104b93 22 libruby.dylib 0x0000000100104b93 vm_exec + 1203
0x100105ce6 23 libruby.dylib 0x0000000100105ce6 yield_under + 710
0x100106188 24 libruby.dylib 0x0000000100106188 specific_eval + 72
0x1000fd0e4 25 libruby.dylib 0x00000001000fd0e4 vm_call_cfunc + 340
0x1000fe9b0 26 libruby.dylib 0x00000001000fe9b0 vm_call_method + 896
0x1000ff8fc 27 libruby.dylib 0x00000001000ff8fc vm_exec_core + 3180
0x100104b93 28 libruby.dylib 0x0000000100104b93 vm_exec + 1203
0x10010b6bf 29 libruby.dylib 0x000000010010b6bf rb_f_catch + 639
0x1000fd0e4 30 libruby.dylib 0x00000001000fd0e4 vm_call_cfunc + 340
0x1000fe9b0 31 libruby.dylib 0x00000001000fe9b0 vm_call_method + 896
0x1000ff8fc 32 libruby.dylib 0x00000001000ff8fc vm_exec_core + 3180
0x100104b93 33 libruby.dylib 0x0000000100104b93 vm_exec + 1203
0x10010aac9 34 libruby.dylib 0x000000010010aac9 rb_yield + 505
0x100007902 35 libruby.dylib 0x0000000100007902 rb_ary_each + 82
0x1000fd0e4 36 libruby.dylib 0x00000001000fd0e4 vm_call_cfunc + 340
0x1000fe9b0 37 libruby.dylib 0x00000001000fe9b0 vm_call_method + 896
0x1000ff8fc 38 libruby.dylib 0x00000001000ff8fc vm_exec_core + 3180
0x100104b93 39 libruby.dylib 0x0000000100104b93 vm_exec + 1203
0x100105ce6 40 libruby.dylib 0x0000000100105ce6 yield_under + 710
0x100106188 41 libruby.dylib 0x0000000100106188 specific_eval + 72
0x1000fd0e4 42 libruby.dylib 0x00000001000fd0e4 vm_call_cfunc + 340
0x1000fe9b0 43 libruby.dylib 0x00000001000fe9b0 vm_call_method + 896
0x1000ff8fc 44 libruby.dylib 0x00000001000ff8fc vm_exec_core + 3180
0x100104b93 45 libruby.dylib 0x0000000100104b93 vm_exec + 1203
0x10010b6bf 46 libruby.dylib 0x000000010010b6bf rb_f_catch + 639
0x1000fd0e4 47 libruby.dylib 0x00000001000fd0e4 vm_call_cfunc + 340
0x1000fe9b0 48 libruby.dylib 0x00000001000fe9b0 vm_call_method + 896
0x1000ff8fc 49 libruby.dylib 0x00000001000ff8fc vm_exec_core + 3180
0x100104b93 50 libruby.dylib 0x0000000100104b93 vm_exec + 1203
0x100106643 51 libruby.dylib 0x0000000100106643 rb_vm_invoke_proc + 691
0x100111803 52 libruby.dylib 0x0000000100111803 thread_start_func_2 + 835
0x100111921 53 libruby.dylib 0x0000000100111921 thread_start_func_1 + 17
0x7fff82ff58b6 54 libSystem.B.dylib 0x00007fff82ff58b6 _pthread_start + 331
0x7fff82ff5769 55 libSystem.B.dylib 0x00007fff82ff5769 thread_start + 13

[NOTE]
You may encounter a bug of Ruby interpreter. Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

Abort trap

Uninitialized constant MysqlCompat::MysqlRes

Note: I'm using Mac OS X Version: 10.6.3

Open the Terminal.

First removed all mysql gems:

• gem uninstall mysql

After removing the mysql gem run the following:

sudo env ARCHFLAGS="-arch x86_64" gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

Uninstall MySQL on Mac OS X

NOTE: This will delete all your databases.

Open the Terminal then do the following:

• sudo rm /usr/local/mysql
• sudo rm -rf /usr/local/mysql*
• sudo rm -rf /Library/StartupItems/MySQLCOM
• sudo rm -rf /Library/PreferencePanes/My*
• sudo rm -rf ~/Library/PreferencePanes/My*
• edit /etc/hostconfig and remove the line MYSQLCOM=-YES-
• sudo rm -rf /Library/Receipts/mysql*
• sudo rm -rf /Library/Receipts/MySQL*
• sudo rm -rf /var/db/receipts/com.mysql.*

J2ME String Split Method

private String[] split(String _text, String _separator) {
Vector nodes = new Vector();
// Parse nodes into vector
int index = _text.indexOf(_separator);

while (index >= 0) {
nodes.addElement(_text.substring(0, index));
_text = _text.substring(index + _separator.length());
index = _text.indexOf(_separator);
}
// Get the last node
nodes.addElement(_text);

// Create splitted string array
String[] result = new String[nodes.size()];
if (nodes.size() > 0) {
for (int loop = 0; loop < nodes.size(); loop++) {
result[loop] = (String) nodes.elementAt(loop);
System.out.println(result[loop]);
}
}
return result;
}