i have one question around the runOnUiThread...Basically when i used this
method in the onCreate/onStart of the Activity,i found that it works quite
differently than i expect..
For example in the onCreate/onStart..say I have long running operation
before which i want to render the UI with a progress bar.and after the long
runnin operation is complete remove the progress bar and show the view..In
this case I found that the UI is rendered only after the long running
operation...so i end up not seeing the progress bar..I ended up using the
handler...Am i going wrong in my understanding of this method?
protected void onStart(){
super.onStart();
////Progress Bar Visible
runOnUiThread( new Thread() {
// go get our feed!
public void run() {
//longrunning operation
//Progress Bar Gone
//show the required view
}
});
}
On Wed, Jan 21, 2009 at 7:55 PM, Mark Murphy <mmur...@commonsware.com>wrote:
>
> Nico wrote:
> > Hi,
> > I need to replace the current View (set by the activity.setContentView
> > method) by an other.
> > When I call activity.setContentView two times, I get this exception :
> > 01-21 14:13:54.747: WARN/System.err(1156): android.view.ViewRoot
> > $CalledFromWrongThreadException: Only the original thread that created
> > a view hierarchy can touch its views.
> > 01-21 14:13:54.757: WARN/System.err(1156): at
> > android.view.ViewRoot.checkThread(ViewRoot.java:1849)
> > 01-21 14:13:54.757: WARN/System.err(1156): at
> > android.view.ViewRoot.requestLayout(ViewRoot.java:455)
> > 01-21 14:13:54.767: WARN/System.err(1156): at
> > android.view.View.requestLayout(View.java:6575)
> > 01-21 14:13:54.767: WARN/System.err(1156): at
> > android.view.View.requestLayout(View.java:6575)
> > 01-21 14:13:54.777: WARN/System.err(1156): at
> > android.view.View.requestLayout(View.java:6575)
> > 01-21 14:13:54.777: WARN/System.err(1156): at
> > android.view.ViewGroup.removeAllViews(ViewGroup.java:2033)
> > What is problem ?
>
> As the exception says: "Only the original thread that created
> a view hierarchy can touch its views".
>
> Are you attempting to call setContentView() from a background thread? If
> so, arrange to call it on the UI thread, via post(), runOnUiThread(), or
> a Handler.
>
> --
> Mark Murphy (a Commons Guy)
> http://commonsware.com
> Android Training in Sweden -- http://www.sotrium.com/training.php
>
> >
>
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