Hi,
The problem is, each time orientation is changed, Activity is
destroyed and recreated (that means onCreate is called, later onStart
is called). Now, when you change orientation inside onCreate, then
orientation is changed, activity is recreated again ---> this causes
to onCreate to be called again (and again and again ....)
onCreate is even called before the Activity is shown on the screen.
I can think of one way around. Get rid of all orientation changing
codes form onCreate and onStart.
Then, before starting an activity, change orientation (if required)
according to the requirement of the activity to be started.
For example: suppose you need LANDSCAPE for Activity2, then (see how
the condition of if changed)
//---------------
if(this.getRequestedOrientation() !=
ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}
//Start Activity2 here
//---------------
If you dont want to do as I told above, you need to prevent your
activities from being destroyed and recreated when orientation is
changed. Fortunately, that is possible.
Go to this link:
http://developer.android.com/reference/android/app/Activity.html#ConfigurationChanges
Quote from the page:
[QUOTE]
In some special cases, you may want to bypass restarting of your
activity based on one or more types of configuration changes. This is
done with the android:configChanges attribute in its manifest. For
any types of configuration changes you say that you handle there, you
will receive a call to your current activity's
onConfigurationChanged(Configuration) method instead of being
restarted. If a configuration change involves any that you do not
handle, however, the activity will still be restarted and
onConfigurationChanged(Configuration) will not be called.
[/QUOTE]
Regards
Sarwar Erfan
On Jul 29, 3:21 pm, Robert <[email protected]> wrote:
> Thanks Sarwar for your answer. But when I put this code into the
> onStart method. The orientation will always be Portrait.
> When I discard the if-part, I am getting the same problem as mentioned
> above. I realized now that, when the app enters the onStart the
> orientation is initally -1(thats why I get the portrait-orientation
> with the if-part). When the setrequestedorientation is called the
> orientation is 0 (LANDSCAPE), as I requested. And then it is in this
> infinite loop and when its now entering the onstart the
> requestedorientation is 1 (PORTRAIT). Which is really weird to me.
> Should I do anything in the TabActivity!? Any suggestions are very
> welcome.
> Thanks
>
> On Jul 29, 10:46 am, Sarwar Erfan <[email protected]> wrote:
>
> > Hi,
> > Good day.
>
> > Change the orientation (call setRequestedOrientation) inside
> > overridden method of onStart, NOT inside onCreate. (do it in both
> > Activity1 and Activity2)
>
> > Regards
> > Sarwar Erfan
>
> > On Jul 29, 2:25 pm, Robert <[email protected]> wrote:
>
> > > Hello,
> > > I have a tabactivity where my app is running in. One of the tabs needs
> > > to have landscape orientation, assume this is activity2, activity1
> > > needs to have portrait-orientation.
>
> > > In activity1 I do have code like:
>
> > > public void onCreate(Bundle savedInstanceState) {
> > > super.onCreate(savedInstanceState);
> > > if(this.getRequestedOrientation() ==
> > > ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)
>
> > > this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
>
> > > }
>
> > > And in activity2:
>
> > > public void onCreate(Bundle savedInstanceState) {
> > > super.onCreate(savedInstanceState);
> > > if(this.getRequestedOrientation() ==
> > > ActivityInfo.SCREEN_ORIENTATION_PORTRAIT)
>
> > > this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
>
> > > }
>
> > > So when I now want to change from activity1 to activity2. It seems as
> > > my app is in a infinite-loop, it tries to start activity2 again and
> > > again, but it doesnt appear. I dont get an exception either!
>
> > > Is that some know bug of android or am I doing something wrong. Help a
> > > appreciated a lot.
>
> > > Thanks
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