Proper way of dismissing DialogFragment while application is in background

DialogFragment has a method called dismissAllowingStateLoss()

This is what I had to do to achieve what you want: I have a Fragment activity on which i was showing a dialog fragment named fragment_RedemptionPayment which is globally declared at the top. The following code dismisses the DialogFragment if it was showing before the activity goes in background and comes back in foreground.

     @Override
        public void onResume() {
            super.onResume();        
            if(fragment_RedemptionPayment.isVisible()){
                fragment_RedemptionPayment.dismiss();
            }
}

This is what I did (df == dialogFragment):

Make sure that you call the dialog this way:

df.show(getFragmentManager(), "DialogFragment_FLAG");

When you want to dismis the dialog make this check:

if (df.isResumed()){
  df.dismiss();
}
return;

Make sure that you have the following in the onResume() method of your fragment (not df)

@Override
public void onResume(){
  Fragment f = getFragmentManager().findFragmentByTag("DialogFragment_FLAG");
  if (f != null) {
    DialogFragment df = (DialogFragment) f;
    df.dismiss();
  }
  super.onResume();
}   

This way, the dialog will be dismissed if it's visible.. if not visible the dialog is going to be dismisded next the fragment becomes visible (onResume)...