Luca Zanini
  • Home
    • Astronomy
    • Android
    • Java
    • Lotus
  • About me
  • Displaying notifications and progress bar from an instance of AsyncTask

    Apr 4, 2014

    —

    by

    Luca Zanini
    in Android

    The AsyncTask class is used to perform background tasks and it might be useful to show notifications and progress bars to alert the user. In this post I write an example where I create two AsyncTask instances showing a startup notification, a progress bar and a notification of completed task

    Read more: Displaying notifications and progress bar from an instance of AsyncTask

  • How to change the look and feel of a view using css

    Mar 31, 2014

    —

    by

    Luca Zanini
    in Lotus

    A lotus view open in a browser is very ugly but you can greatly improve using stylesheets (css); here I explain how to use the css in a lotus view in order to improve the look and feel and to display rows in alternate colors.

    Read more: How to change the look and feel of a view using css

  • How to display an icon in the preferences

    Mar 12, 2014

    —

    by

    Luca Zanini
    in Android

    In the Android preferences you can put different types of controls: check box, edit box, list,…, but none of these displays an icon (see Settings). Usually a preference consists of two lines, the title and the summary, and after you have clicked you get a dialog box where you can select the chosen item, as…

    Read more: How to display an icon in the preferences

  • Running a fortran program from java

    Feb 12, 2014

    —

    by

    Luca Zanini
    in Java

    In this post I write an example about how to launch a fortran executable form a java program passing some arguments and getting back a result. The chosen example uses code written in fortran to get primes, it is from Sieve of Eratosthenes.

    Read more: Running a fortran program from java

  • Getting the variables of the outer class from an inner class

    Jan 27, 2014

    —

    by

    Luca Zanini
    in Java

    The inner classes, and then not static, can access even if with some limitation to the variables of the outer class.

    Read more: Getting the variables of the outer class from an inner class

  • Truncatable primes

    Jan 4, 2014

    —

    by

    Luca Zanini
    in Uncategorized

    Project Euler Problem 37: The number 3797 has an interesting property. Being prime itself, it is possible to continuously remove digits from left to right, and remain prime at each stage: 3797, 797, 97, and 7. Similarly we can work from right to left: 3797, 379, 37, and 3. Find the sum of the only…

    Read more: Truncatable primes

  • Double-base palindromes

    Dec 21, 2013

    —

    by

    Luca Zanini
    in Uncategorized

    From the Project Euler Problem 36: The decimal number, 585 = 10010010012 (binary), is palindromic in both bases. Find the sum of all numbers, less than one million, which are palindromic in base 10 and base 2. (Please note that the palindromic number, in either base, may not include leading zeros.) checked

    Read more: Double-base palindromes

  • How to implement Up Navigation

    Dec 19, 2013

    —

    by

    Luca Zanini
    in Android

    In this example you can see how to implement the Up Navigation, i.e. the option to go back to a previous activity using the button in the upper left of the action bar. The previous activity can be a fixed activity or an activity determined at runtime.

    Read more: How to implement Up Navigation

  • Circular primes

    Dec 15, 2013

    —

    by

    Luca Zanini
    in Uncategorized

    From the Project Euler Problem 35: The number, 197, is called a circular prime because all rotations of the digits: 197, 971, and 719, are themselves prime. There are thirteen such primes below 100: 2, 3, 5, 7, 11, 13, 17, 31, 37, 71, 73, 79, and 97. How many circular primes are there below…

    Read more: Circular primes

  • Digit factorials

    Nov 30, 2013

    —

    by

    Luca Zanini
    in Uncategorized

    From the Project Euler Problem 34: 145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145. Find the sum of all numbers which are equal to the sum of the factorial of their digits. Note: as 1! = 1 and 2! = 2 are not sums…

    Read more: Digit factorials

←Previous Page Next Page→