Read a text file line by line in Java

///
/// read the file line by line
///
try {
 BufferedReader in = new BufferedReader(new FileReader(args[0]));
 String str;
 while ((str = in.readLine()) != null) {
  _log(str);
 }
 in.close();
} catch (IOException e) {
}

Write a text file in Android using the emulator in Eclipse

///
/// check read/write permissions

boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();

if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
mExternalStorageAvailable = mExternalStorageWriteable = true;
Log.i(TAG,"read + write");
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
Log.i(TAG,"read");
} else {
// Something else is wrong. It may be one of many other states, but all we need
//  to know is we can neither read nor write
mExternalStorageAvailable = mExternalStorageWriteable = false;
Log.i(TAG,"nothing");
}

///
/// write text file

File testFile = new File(Environment.getExternalStorageDirectory()+"/test.txt");
try{
testFile.createNewFile();
}catch(IOException e){
Log.e("IOException", "exception in createNewFile() method");
}
//we have to bind the new file with a FileOutputStream
FileOutputStream os = null;        
try{
os = new FileOutputStream(testFile);
}catch(FileNotFoundException e){
Log.e("FileNotFoundException", "can't create FileOutputStream");
}

PrintWriter pw = new PrintWriter(os);

pw.println("test");
pw.close();

Log.i(TAG,"wrote in: " + Environment.getExternalStorageDirectory()+ "/test.txt");

Install subclipse (subversion) in Eclipse in a few steps

To install Subclipse (subversion) repository plugin in Eclipse, do the following:

• 1. Open Eclipse
• 2. Help -> Install new software...
• 3. Click "Add.."
• 4. Add this repository (the name does not matter; the URL does):

http://subclipse.tigris.org/update_1.6.x

• 5. Type "subclipse" in the blank caption to search the plugin
• 6. Select it and install it

Note that you need internet connection :)

Grooveshark: alternativa (también gratuita) a Spotify

¿Tienes problemas con Spotify?
¿No conoces las alternativas?
¿Quieres tener acceso a toda la música desde el propio navegador?

Grooveshark: http://listen.grooveshark.com

Create a proxy server in 3 minutes in Ubuntu

Find a simple and easy manual in the following site:

http://en.kioskea.net/faq/804-ubuntu-installing-an-http-proxy-server-squid

YouTube para el salón

Si eres de los que conecta el ordenador a la televisión y ve vídeos de YouTube desde el sofá de casa, seguro que te gustan estas versiones de YouTube.

La primera es una versión gigante, y se llama "XL":

http://www.youtube.com/xl

La otra es una versión a pantalla completa, y se llama "Leanback":

http://www.youtube.com/leanback

a disfrutar!!!

LaTeX compiling error

If you are compiling a LaTeX document, and you get the following error:

! I can't find file `ptmr7t'

Here you have the solution:

sudo apt-get install texlive-fonts-recommended

Fix @ (at) character problem with Ubuntu in Macbook

If you can't write the @ character in Ubuntu, you should do this:

1. System > Preferences > Keyboard
2. Go to Keyboard Distribution label
3. Click Options
4. Look for something like "Key to access the third level" (sorry, my Ubuntu is Spanish ;-)
5. Select the key you are used to use when typing the @ symbol (I selected the "Alt" key)

That's all,
Enjoy!!

Some keywords for spanish readers: arreglar, problema, arroba, macbook, ubuntu

Install Qt Ruby (qt4-qtruby) in Linux / Ubuntu

Hi!!
You only need to do this:

sudo apt-get install ruby libqt4-qtruby

Maybe you need to install "qt4-dev-tools" if you do not have Qt4 libraries installed in your system.

Enjoy!!

PS: here I include a sample code to test if it works fine:


require 'Qt4'

app = Qt::Application.new(ARGV)

window = Qt::Widget.new()
window.resize(200, 120)

quit = Qt::PushButton.new('Quit', window)
quit.font = Qt::Font.new('Times', 18, Qt::Font::Bold)
quit.setGeometry(10, 40, 180, 40)
Qt::Object.connect(quit, SIGNAL('clicked()'), app, SLOT('quit()'))

window.show()
app.exec()



Error while compiling Qt 4.7.1 in Debian Ubuntu (solved)

Did you get this error?:

You might need to modify the include and library search paths by editing  QMAKE_INCDIR_X11 and QMAKE_LIBDIR_X11

Just do this:

sudo apt-get install libx11-dev libfreetype6-dev libavahi-gobject-dev libSM-dev libXrender-dev libfontconfig-dev libXext-dev