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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Optionally ignore @UIThread call when @EFragment is detached from Activity?","articleBody":"When using `@Background` in conjunction with `@UIThread` annotations on an `@EFragment`, it's possible that many developers don't want to run the method annotated with the `@UIThread` annotation if the Fragment is no longer attached to the activity.  I think it would be great to add an annotation (something like `@IgnoredWhenDetached`) with the following rules: \n\n1) Must also have the `@UIThread` annotation\n2) Can only be used in conjunction with `@EFragment` classes\n3) Simply wraps the `@UIThread`method call in an if block like so\n\n``` java\nif(isAdded()) {\n    //executable code\n}\n```\n\nor\n\n``` java\nif(getActivity() != null) {\n    //executable code\n}\n```\n\nHere is a simple example and in my application I have dozens of things similar to this\n\n``` java\n@EFragment\npublic class LoaderFragment extends Fragment {\n\n    @Background\n    void longTask() {\n        try {\n            updateProgress(0);\n            Thread.sleep(1000);\n            updateProgress(50);\n            Thread.sleep(1000);\n            updateProgress(100);\n        } catch (InterruptedException e) {\n            killActivity()        \n        }\n    }\n\n    @IgnoredWhenDetached\n    @UiThread\n    void updateProgress(int progress) {\n        getActivity().setProgress(progress);\n    }\n\n    @IgnoredWhenDetached\n    @UiThread\n    void killActivity(int progress) {\n        getActivity().finish();\n    }\n```\n\nThis essentially prevents the two `@UIThread` methods from getting a NPE if the Fragment were to have been destroyed at any point during the execution of the `@Background` method.  While I realize this is something that can be easily guarded against by a simple null check, it makes the code much cleaner and is a very common use case in conjunction with Fragments.  I would be more than happy to submit a pull request pending thoughts/comments about this.  This could also be useful in conjunction with `@Background` on an `@EFragment` as well, but not a very common use case. \n\nVince\n","author":{"url":"https://github.com/vincentjames501","@type":"Person","name":"vincentjames501"},"datePublished":"2014-01-10T22:13:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/875/androidannotations/issues/875"}