CODEWITHSUNDEEP
android
cliff2310
cliff2310

Reputation: 590

Where do I put processing that needs to be done before onCreate()?

My application needs to read a file and process that information to build the list need by the activity. I can't find a good place to do it. What I have is in the body of the activity, in a { do the work } block. If I don't put the {...} around it, there are errors. This works, but is it the 'correct' way to do this? Is there a better way? This processing is only done once.
Thanks for your help

Cliff

Upvotes: 0

Views: 176

Answers (2)

Brian Cooley
Brian Cooley

Reputation: 11662

It kind of depends on what exactly you are doing, but one common way to do lengthy processing is to create a subclass of AsyncTask that does the processing in its doInBackground method and updates the UI in its onPostExecute method. Then, you can create an instance of the AsyncTask in onCreate or onResume, call its execute method, and still have a responsive UI while the processing is occurring.

That's the way I would do it if the processing is tied to that particular Activity, such that you might want to stop the processing if the user left the Activity. If the processing were more generally useful and generated data that might be used elsewhere in the app, then I'd consider using a subclass of Service or IntentService.

Specifics are always helpful. If you can share more details about what you are trying to do, it will be easier to suggest the most appropriate solution.

Upvotes: 2

Michell Bak
Michell Bak

Reputation: 13242

You can see the Android Activity lifecycle here: http://developer.android.com/reference/android/app/Activity.html

As you can see, onCreate() is the first thing that happens when an Activity is launched. Depending on the size of your file, it's OK to read it in the onCreate() method. Alternatively, you can set up your layout and then create a ProgressDialog that shows the file loading - once it's done loading, you just dispose the dialog and build the list you want.

Upvotes: 0

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