solid wrote:
> So I have the body of my oncreate method something like this:
> <code>
> pd = ProgressDialog.show(this,
>
> "Calculating...",
> "Please be
> patient. ",
> true, false);
> Thread thread = new Thread(this);
> thread.start();
>
> </code>
>
> My activity also extends Runnable so here is the run method along with
> the handler:
> <code>
> public void run() {
> Thread.sleep(25000L);
> // in real world some calculation call would go here
> handler.sendEmptyMessage(0);
>
> }
>
> private Handler handler = new Handler() {
> @Override
> public void handleMessage(Message msg) {
>
> MyActivity.this.populateMainView();
> pd.dismiss();
> }
> };
> </code>
>
>
> All of the above works great unless someone changes the screen
> orientation while the calculation is running. If the orientation
> changes the OnCreate method runs again. Additionally, if someone
> changes the orientation _AFTER_ the run method has completed (and the
> view has been populated), The onCreate Runs again and the values are
> recreated even though the data has not changed. I want my method views
> to reorient without affecting the state of my thread. What is the
> right way to do this? I know there is a very basic concept of
> activity lifecycle that I am missing, but I cannot find anything about
> this anywhere.
Include some information in onRetainNonConfigurationInstance() that will
tell onCreate() what to do (e.g., boolean indicating "we're changing
orientation, so please do not re-do the calculations").
Or, move the calculation logic into a service, which is not affected by
orientation changes.
--
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy
Android App Developer Books: http://commonsware.com/books.html
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