Android Development Notes

Avoid using non-static inner classes in an activity if instances of the inner class could outlive the activity’s lifecycle.

  • In Java, non-static inner and anonymous classes hold an implicit reference to their outer class. Static inner classes, on the other hand, do not.
  • Instead, prefer static inner classes and hold a weak reference to the activity inside.
  • Use the following code to avoid leaking the Activity and its Context.
  • Declaration -> private static class MyHandler extends Handler
  • Inner class attribute -> WeakReference<Activity> act;
  • Inner class instantiation -> act = new WeakReference<Activity>(activity);
  • Inner class reference -> Activity activity = act.get();


Final, Finally, Finalize

  • Final
    • final attribute is when the variable reference cannot be changed and becomes a constant.
    • final method is a method that cannot be overridden.
    • final class is a class that cannot be inherited or extended.
  • Finally
    • in a try – catch block, the finally block is for any cleanup required in the code that got executed from the try block when the exception occurred.
  • Finalize
    • This is a class method that is called when the object is ready for but right before garbage collection for cleanup.

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