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Date: Wed, 7 Sep 2011 01:30:28 -0700 (PDT)
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Subject: Re: Black screen after switching to another app
From: MarcoAndroid <marco...@gmail.com>
To: Android Developers <android-developers@googlegroups.com>
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Content-Transfer-Encoding: quoted-printable

Are you sure you know which code gets executed? I'd add breakpoints/
logging statements to see what's happening... At least a logstatement
on all onStart(), onResume() onXYZ() methods entry points. Maybe then
you get a better idea on what's going on.

On 6 sep, 18:58, MobileVisuals <eyv...@astralvisuals.com> wrote:
> Thanks, I added this code to the app, but the problem remains. I don't
> know if I should use suspend and resume on the GUI thread, because the
> documentation says that it could cause deadlocks.Do you know if there
> is some more that I can do to solve this issue?
>
> protected void onPause() {
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 super.onPause();
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (!menu2d)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 glSurfaceView.onPause();
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 else
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 mLunarView.getThread().su=
spend();
>
> =A0 =A0 =A0 =A0 }
> protected void onResume() {
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 super.onResume();
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (!menu2d)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 glSurfaceView.onResume();
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 else
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 mLunarView.getThread().re=
sume();
>
> =A0 =A0 =A0 =A0 }
>
> On Sep 6, 2:43=A0pm, Daniel Drozdzewski <daniel.drozdzew...@gmail.com>
> wrote:
>
>
>
>
>
>
>
> > On 6 September 2011 13:32, MobileVisuals <eyv...@astralvisuals.com> wro=
te:
>
> > > My app has a SurfaceView and a GLSurfaceView. =A0I can switch back an=
d
> > > forth between these. The SurfaceView is the application GUI.
>
> > > I test switching to another app. I can then switch back to the
> > > GLSurfaceView in my app. I then try to switch back to the
> > > GLSurfaceView,where the application GUI is. Here is where the problem
> > > occurs. A black screen is shown instead of the GUI.
>
> > > The app still works, because the application menu is shown when the
> > > menu button is pressed. But nothing is drawn on the screen, it is onl=
y
> > > black. I have tried almost everything to fix this, I have checked tha=
t
> > > the thread is running and that no instance of any object (like the
> > > SurfaceHolder) is null. What could be the reason for this black scree=
n?
>
> > Do you call GLSurfaceView.resume() from Activity.resume() ?
>
> > By the same token you should be calling GLSurfaceView.pause() in the
> > right moment of your activity lifecycle.
>
> > HTH
>
> > --