public void startActivityForResult(Intent intent, int requestCode) {
        if (requestCode != -1 && (requestCode&0xffff0000) != 0) {
            throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");
        }
        super.startActivityForResult(intent, requestCode);
    }

/**
  * Called by Fragment.startActivityForResult() to implement its behavior.
  */
 public void startActivityFromFragment(Fragment fragment, Intent intent,
         int requestCode) {
     if (requestCode == -1) {
         super.startActivityForResult(intent, -1);
         return;
     }
     if ((requestCode&0xffff0000) != 0) {
         throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");
     }
     super.startActivityForResult(intent, ((fragment.mIndex+1)<<16) + (requestCode&0xffff));
 }

/**
  * Dispatch incoming result to the correct fragment.
  */
 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     mFragments.noteStateNotSaved();
     int index = requestCode>>16;
     if (index != 0) {
         index--;
         if (mFragments.mActive == null || index < 0 || index >= mFragments.mActive.size()) {
             Log.w(TAG, "Activity result fragment index out of range: 0x"
                     + Integer.toHexString(requestCode));
             return;
         }
         Fragment frag = mFragments.mActive.get(index);
         if (frag == null) {
             Log.w(TAG, "Activity result no fragment exists for index: 0x"
                     + Integer.toHexString(requestCode));
         } else {
             frag.onActivityResult(requestCode&0xffff, resultCode, data);
         }
         return;
     }

     super.onActivityResult(requestCode, resultCode, data);
 }