android-discuss, Calling an AlertDialog from inside onOptionsItemSelected

 I'm getting an exception when I try to pop up an alert dialog from
within the onOptionsItemSelected method of an Activity. The exception
looks like this:

W/WindowManager(   57): Attempted to add window with non-application
token WindowToken{43c4d3b0 token=null}.  Aborting.

I pasted the same code into a button's onClick method and it worked
fine. Any ideas?

Here's the code:

                        AlertDialog alertDialog = new
AlertDialog.Builder(getApplicationContext()).create();
                        alertDialog.setTitle(R.string.confirmClear);
                        alertDialog.setMessage(getString(R.string.areYouSure));
                        alertDialog.setButton(AlertDialog.BUTTON_POSITIVE,
getString(R.string.yes), new DialogInterface.OnClickListener() {
                          public void onClick(DialogInterface dialog, int 
which) {
                                /*
                                * This is where we clear all the events from 
the database.
                                */
                                // do something
                        } });
                        alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE,
getString(R.string.no), new DialogInterface.OnClickListener() {
                          public void onClick(DialogInterface dialog, int 
which) {
                               // don't do anything
                            return;
                        } });
                        alertDialog.show();

--

 Get rid of all occurrences of getApplicationContext() from your code,
including the one shown in the snippet below. Use "this" instead
(minus the quotes), as that will be a perfectly valid Context, one
much better suited for your purposes.



>

 That worked. Mark, you rock...and after 7pm too!

--

 


What? People are tracking my sleeping habits now?

:-)

I was probably a bit over the top by saying to delete all
getApplicationContext() calls, though there's so few cases where that
is the right method to use, I can't think of any of them off the top
of my head. Certainly if you're trying to do anything with the GUI,
getApplicationContext() is lobotomized -- your Activity is a far
better Context for methods that need one.

-- 
Mark Murphy (a Commons Guy)
 http://commonsware.com  |  http://github.com/commonsguy 
 http://commonsware.com/blog  |  http://twitter.com/commonsguy 

_The Busy Coder's Guide to Android Development_ Version 3.1 Available!

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