MainActivity.java 文件源码

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
    menuItem.setChecked(true);

    Fragment fragment = new PostsFragment();
    String title = getString(R.string.posts);

    switch (menuItem.getItemId()) {
        case R.id.action_home:
            setFABVisibility(true);
            break;
        case R.id.action_peoples:
            title = getString(R.string.users);

            setFABVisibility(false);
            fragment = new UsersFragment();
            break;
        case R.id.action_notifications:
            title = getString(R.string.notifications);
            setFABVisibility(false);
            fragment = new NotificationsFragment();
            break;
        case R.id.action_messages:
            title = getString(R.string.messages);
            setFABVisibility(false);
            fragment = new NotificationsFragment();
            break;
    }

    // change toolbar title
    setTitle(title);

    // Replace with the selected fragment
    IntentUtils.replaceFragment(R.id.frame_layout,
            getSupportFragmentManager(), fragment);
    return false;
}