Time for action – responding to preference changes

In order to react when preferences are changed, it is necessary to inject the preference value as part of a method call. When the preference value is changed, the method will be invoked again with the new value.

1. Remove the annotations associated with the launchCount instance field.

2. Create a setLaunchCount method that takes an int argument and assigns it to the launchCount instance field.

   Tip

   Type setL and press Ctrl + space to suggest creating this method automatically.

3. Add the @Inject annotation to the setLaunchCount method.

4. Add the @Preference(nodePath = "com.packtpub.e4.clock.ui", value = "launchCount") annotation to the method argument. The resulting method will look like this:

   int launchCount;
   
   @Inject
   public void setLaunchCount(
    @Preference(nodePath = "com.packtpub.e4.clock.ui",
      value = "launchCount") int launchCount) {
     this.launchCount = launchCount;
   }

5. Run the target Eclipse instance, and open the Time Zone Tree View. In the Console...