Fragments Not Working Correctly After Orientation Change

Question

I am having a problem with Fragments and orientation change.

I have an application which has a MainActivity which handles the switching up

Answer 1

It sounds like you don't have something in your onCreate method wrapped in a if(savedInstanceState == null), so you are creating another fragment in addition to the one being restored from the savedInstanceState bundle.

EDIT

Looking more closely at your code, I think I was wrong about the onCreate, your onTabSelected should handle it. I think your if (mFragment == null) is always coming up null, because you don't try and find the fragment. Change that code section to:

@Override 
public void onTabSelected(Tab tab, android.support.v4.app.FragmentTransaction ft) { 

    mFragment = mActivity.getSupportFragmentManager().findFragmentByTag(mTag);   // add this

    if (mFragment == null){ // check to see if the fragment has already been initialised. If not create a new one. 
        mFragment = android.support.v4.app.Fragment.instantiate(mActivity, mClass.getName()); 
        ft.add(android.R.id.content,mFragment,mTag); 
    } else { 
        ft.attach(mFragment); // if the fragment has been initialised attach it to the current activity 
    } 
}