Android Error When Calling "requestWindowFeature( Window.FEATURE_PROGRESS );" in Activity

Question

I'm attempting to display loading progress for a WebView in an Android Activity. When I attempt to display the window's progress bar with:

requestWindowFeature( Window.FEATURE_PROGRESS );

as per http://developer.android.com/guide/appendix/faq/commontasks.html#progressbar but at this point I get a debugging error.

When the error occurs I see a new tab "ActivityThread.performLaunchActivity" in Eclipse which has a message "Source not found." and a button "Edit Source Lookup Path...".

When I remove the offending line I don't get this error.

What could be causing this problem? Do I need to set a permission in the AndroidManifest.xml file or is there something else I'm missing?

Answer 1

Have you tried making your requestWindowFeature() call before you call setContentView()?

This is necessary according to this post.

The docs for Window.requestFeature():

Enable extended screen features. This must be called before setContentView(). May be called as many times as desired as long as it is before setContentView().

Answer 2

Use:

public class MainActivity extends Activity

instead of:

public class MainActivity extends ActionBarActivity

Answer 3

Make sure you are calling requestWindowFeature( Window.FEATURE_PROGRESS ); before you call setContentView() in onCreate().