Waiting till the async task finish its work

Question

I m very new to programming and I have some doubts    I have a AsyncTask which is I call as RunInBackGround    and I start this process like   new RunInBackGround   execute      But I wish to wait until this call is finish its executing  before proceeding to the other statements of code   How can I do that   Are there any way for it

User · Answer

Although optimally it would be nice if your code can run parallel, it can be the case you're simply using a thread so you do not block the UI thread, even if your app's usage flow will have to wait for it.

You've got pretty much 2 options here;

You can execute the code you want waiting, in the AsyncTask itself. If it has to do with updating the UI(thread), you can use the onPostExecute method. This gets called automatically when your background work is done.
If you for some reason are forced to do it in the Activity/Fragment/Whatever, you can also just make yourself a custom listener, which you broadcast from your AsyncTask. By using this, you can have a callback method in your Activity/Fragment/Whatever which only gets called when you want it: aka when your AsyncTask is done with whatever you had to wait for.

User · Answer

AsyncTask have four methods    onPreExecute  -- for doing something before calling background task in Async  doInBackground  -- operation Task to do in Background  onProgressUpdate  -- it is for progress Update  onPostExecute  -- this method calls after asyncTask return from doInBackground    you can call your work on onPostExecute   it calls after returning from doInBackground     onPostExecute is what you need to Implement

User · Answer

I think the easiest way is to create an interface to get the data from onpostexecute and run the Ui from interface    Create an Interface    public interface AsyncResponse       void processFinish String output       Then in asynctask   Override protected void onPostExecute String data        delegate processFinish data       Then in yout main activity   Override public void processFinish String data            do things

User · Answer

In your AsyncTask add one ProgressDialog like   private final ProgressDialog dialog   new ProgressDialog YourActivity this     you can setMessage in onPreExecute   method like   this dialog setMessage  Processing        this dialog show      and in your onPostExecute Void result  method dismiss your ProgressDialog

User · Answer

wait until this call is finish its executing   You will need to call AsyncTask get   method for getting result back and make wait until doInBackground execution is not complete  but this will freeze Main UI thread if you not call get method inside a Thread    To get result back in UI Thread start AsyncTask as    String str result  new RunInBackGround   execute   get

[android] Waiting till the async task finish its work

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