[android-developers] Problems locking the screen orientation with ActivityInfo.SCREEN_ORIENTATION_NOSENSOR

I have an activity that shows a scrollview with a lot of linearlayouts with a lot of imageviews and textviews.

This activity must show two columns in my scrollview if the orientation is landscape, and it must show one column in my scrollview if the orientation is portrait.

It works fine. I have this code on the onCreate method:

DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);      
    sw=dm.widthPixels;
    sh=dm.heightPixels;

    if (sw>sh)
        portrait=false;

with that code i can check if the screenorientation is portrait or landscape, and then, generate one or two columns in my scrollview. So, each time the user changes the screen orientation, the oncreate get's called again and check wich is the current screen orientation.

As i said, it works fine, but here comes the problem:

This activity shows some buttons for download content from internet using a AsyncTask that shows a horizontal ProgressBar. If i change the orientation while i'm downloading the content from internet and showing the progressBar, then i get a exception like this:

    04-11 14:29:22.655: INFO/WindowManager(1086): Setting rotation to 0, animFlags=0
04-11 14:29:22.678: INFO/ActivityManager(1086): Config changed: { scale=1.0 imsi=310/4 loc=en_US touch=3 keys=2/1/2 nav=2/2 orien=1 layout=34 uiMode=17 seq=75}
04-11 14:29:22.717: INFO/UsageStats(1086): Unexpected resume of com.Magazine while already resumed in com.Magazine
04-11 14:29:22.780: ERROR/WindowManager(4791): Activity com.Magazine.MainMenu has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@447a3e68 that was originally added here
04-11 14:29:22.780: ERROR/WindowManager(4791): android.view.WindowLeaked: Activity com.Magazine.MainMenu has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@447a3e68 that was originally added here
04-11 14:29:22.780: ERROR/WindowManager(4791):     at android.view.ViewRoot.<init>(ViewRoot.java:247)

Then, i suposed that i must lock the screen orientation changes when the user is downloading content and showing the progressbar dialog, and i tryed it locking and unlocking it with this:

((Activity) context).setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR);
((Activity) context).setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);   

IT WORK'S FINE IF I'M IN PORTRAIT MODE and after i start downloading something i try to change to landscape, it blocks the change and works finde. But if i'm in landscape mode and i press the button for download the content from internet and i start the progressbar dialog, then i get this exception, and no need to try to change the orientation to portrait mode, i get the exception instantly:

04-11 14:33:52.405: INFO/WindowManager(1086): Setting rotation to 0, animFlags=1
04-11 14:33:52.420: INFO/ActivityManager(1086): Config changed: { scale=1.0 imsi=310/4 loc=en_US touch=3 keys=2/1/2 nav=2/2 orien=1 layout=34 uiMode=17 seq=77}
04-11 14:33:52.444: INFO/UsageStats(1086): Unexpected resume of com.Magazine while already resumed in com.Magazine
04-11 14:33:52.952: INFO/global(4831): Default buffer size used in BufferedReader constructor. It would be better to be explicit if an 8k-char buffer is required.
04-11 14:33:53.342: DEBUG/dalvikvm(4831): GC_FOR_MALLOC freed 15782 objects / 1323968 bytes in 52ms
04-11 14:33:53.358: ERROR/WindowManager(4831): Activity com.Magazine.MainMenu has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4490f888 that was originally added here
04-11 14:33:53.358: ERROR/WindowManager(4831): android.view.WindowLeaked: Activity com.Magazine.MainMenu has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4490f888 that was originally added here
04-11 14:33:53.358: ERROR/WindowManager(4831):     at android.view.ViewRoot.<init>(ViewRoot.java:247)

Why it is working in portrait mode and not when i'm in landscape mode?

what is wrong here?

Thanks

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