ProgressBar at start of application

by Pinheiro » Fri, 02 Apr 2010 18:23:51 GMT

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I'm developing an application where at the start a file is downloaded.
To keep users happy, I want to show an indeterminate progressbar while
the file is being download.
Unfortunately, the progressbar never appears, I only get a black
screen when the file is being downloaded and then the main layout
appears. Here's the code:


        ProgressDialog dialog =
                "Loading");; // Stop ProgressBar

        // Download file - could take lots of time
        String str=downloadUrl("" ;);

       dialog.cancel(); // Stop ProgressBar

 What am I missing? Do I have to create an empty layout with just a
progressbar to do this?

 Thanks in advance for any help :)

Rui Pinheiro


ProgressBar at start of application

by ~ TreKing » Fri, 02 Apr 2010 21:13:50 GMT


A background thread.

Doing what you're doing is blocking the main (UI) thread, so nothing gets
drawn until your complete all calls you're making in onCreate, including the
long, blocking call to download your file. You want to spawn a thread or
start an AyncTask that will do this work in the background and send messages
to the main (UI) thread to tell it when to show and hide the progress bar.

Read up on threads in general and AsyncTask in particular. This should be a
FAQ at this point.

TreKing - Chicago transit tracking app for Android-powered devices 


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ProgressBar at start of application

by Pinheiro » Sat, 03 Apr 2010 00:07:27 GMT

 Ops. Thanks, TreKing!


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