private void resetPreMenuItem() {
if (mPrevMenuItem != null) {
mPrevMenuItem.setChecked(false);
} else {
mBottomNavigationView.getMenu().getItem(0).setChecked(false);
}
}
public void changeToFour(View v) {
// activateNewButton(mBottomNavigationView, 3);
resetPreMenuItem();
mPrevMenuItem = mBottomNavigationView.getMenu().getItem(3);
mPrevMenuItem.setChecked(true);
mViewPager.setCurrentItem(3);
}