Double fragment rotating Android with ActionBar

Question

I\'ve made a simple Android Activity with an ActionBar to switch between 2 fragments. It\'s all ok until I rotate the device. In facts, when I rotate I\'ve got 2 fragment on

Answer 1

I've resolved using onSaveInstanceState and onRestoreInstanceState in the Activity to maintain the selected tab and modifying onTabSelected as follows.

The last modify avoids that Android rebuild the Fragment it doesn't destoy. However I don't understand why the Activity is destroyed by the rotation event while the current Fragment no. (Have you some idea about this?)

public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // previous Fragment management
        Fragment prevFragment;
        FragmentManager fm = mActivity.getFragmentManager();
        prevFragment = fm.findFragmentByTag(mTag); 
        if (prevFragment != null) { 
            mFragment = prevFragment; 
        } // \previous Fragment management

        // Check if the fragment is already initialized
        if (mFragment == null) {
            // If not, instantiate and add it to the activity
            mFragment = Fragment.instantiate(mActivity, mClass.getName());
            ft.add(android.R.id.content, mFragment, mTag);
        } else {
            // If it exists, simply attach it in order to show it
            ft.attach(mFragment);
        }
    }