Question

I know how to lock an app to portrait mode forever:

<activity
android:screenOrientation="portrait"
android:name=".MyActivity"></activity>

I now want to make this a user preference. That is, instead of the user checking/unchecking Settings > Display > Auto-rotate screen for the entire phone, I want to have a similar checkbox for my application only.

How do I do that programmatically?

Answer 1

Thanks to this answer, I came up with the following:

 private void doLock(boolean locked) {
        if (locked) {
            int o = getResources().getConfiguration().orientation;
            if (o == Configuration.ORIENTATION_LANDSCAPE)
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);             
            else if (o == Configuration.ORIENTATION_PORTRAIT)
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);              
        } 
        else {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
        }
  }