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#Logging and Debugging

Since you're doing GUI applications, you can't just System.out.println; to display debugging messages; however, you can:

  • use a Toast, to display a quick message to the screen
  • use Logging to display a message to your IDE/Debugger

##Using Toasts A toast will display a message for a small amount of time, and then make it disappear; the code is very simple; we create a Toast, and call its show method.

Toast.makeText(getApplicationContext(), "mensaje", Toast.LENGTH_SHORT).show();

We can also use Toast.LENGTH_LONG

##Logging

Android defines a class, android.util.Log, with several methods, for logging to the IDE/debugger; the methods usually take two strings, a tag and a messagge; there are several methods, d for debug messages, i for info messages etc (in eclipse, you can filter by tag or priority)

##Challenges

  1. Change your converter (xml) application, so that it logs the celsius and farenheit temperatures
  2. Change your converter so that, if the celsius is 0 or less it displays a toast sayint 'Brrr !'