public void openFrag() {
final DatabaseReference ref = database.child("").child("");
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();

ft.replace(R.id.newsfeedContainer, profileFragment);
ft.addToBackStack("profilefrag");
ft.commit();

candidatesFragment.mFragListener.onFragmentInteraction("Senator");
profileFragment.setReferences(senatorRef);

@Override public void onBackPressed() {
int backStackCount = getSupportFragmentManager().getBackStackEntryCount();
Log.v(BASETAG, "Items in backstack: " + backStackCount);
AlertDialog.Builder builder = new AlertDialog.Builder(this);

if (backStackCount == 0) {
  showExitBuilderDialog(builder);
} else if (newsFeedFragment.isVisible()) {
  builder.setMessage("Are you sure you want to exit?")
      .setCancelable(false)
      .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
          MainActivity.this.finish();
        }
      })
      .setNegativeButton("No", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
          dialog.cancel();
        }
      });
  AlertDialog alert = builder.create();
  alert.show();
} else if (newPostFragment.isVisible()) {
  newPostFragment.mFragListener = null;
  getSupportFragmentManager().popBackStack();
} else if (candidatesFragment.isVisible()) {
  candidatesFragment.mFragListener = null;
  getSupportFragmentManager().popBackStack();
} else if (profileFragment.isVisible()) {
  profileFragment.mFragListener = null;
  getSupportFragmentManager().popBackStack();
} else {
  super.onBackPressed();
  getSupportFragmentManager().popBackStack();
}