当我重新选择底部导航栏中的选项卡时如何刷新？

Question

所以这是我的底部导航栏的代码，在我的选项卡中，我正在从解析中检索数据我的问题是我在我的BottomNavigationView.OnNavigationItemReselectedListener中放了BottomNavigationView.OnNavigationItemReselectedListener ，以便我重新选择重新加载/刷新的选项卡感谢任何帮助！

    final Fragment fragment1 = new HomeFragment();
    final Fragment fragment2 = new UsersFragment();
    final Fragment fragment3 = new ProfileFragment();
    final Fragment fragment4 = new SettingsFragment();
    final FragmentManager fm = getSupportFragmentManager();
    Fragment active = fragment1;

    @Override
    public void onBackPressed() {
        if(ParseUser.getCurrentUser() != null){
            Intent a = new Intent(Intent.ACTION_MAIN);
            a.addCategory(Intent.CATEGORY_HOME);
            a.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(a);
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_home);


        BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation);
        bottomNavigationView.setOnNavigationItemSelectedListener(navigationItemSelectedListener);
     bottomNavigationView.setOnNavigationItemReselectedListener(navigationItemReselectedListener);


        fm.beginTransaction().add(R.id.fragment_container, fragment4, "4").hide(fragment4).commit();
        fm.beginTransaction().add(R.id.fragment_container, fragment3, "3").hide(fragment3).commit();
        fm.beginTransaction().add(R.id.fragment_container, fragment2, "2").hide(fragment2).commit();
        fm.beginTransaction().add(R.id.fragment_container,fragment1, "1").commit();

    }

    private BottomNavigationView.OnNavigationItemSelectedListener navigationItemSelectedListener = new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull @NotNull MenuItem item) {

            switch (item.getItemId()){
                case R.id.nav_home:
                    fm.beginTransaction().hide(active).show(fragment1).commit();
                    active = fragment1;
                    return true;
                case R.id.nav_list:
                    fm.beginTransaction().hide(active).show(fragment2).commit();
                    active = fragment2;
                    return true;
                case R.id.nav_profile:
                    fm.beginTransaction().hide(active).show(fragment3).commit();
                    active = fragment3;
                    return true;
                case R.id.nav_settings:
                    fm.beginTransaction().hide(active).show(fragment4).commit();
                    active = fragment4;
                    return true;
            }
            return false;
        }
    };

    private BottomNavigationView.OnNavigationItemReselectedListener navigationItemReselectedListener = new BottomNavigationView.OnNavigationItemReselectedListener() {
        @Override
        public void onNavigationItemReselected(@NonNull @NotNull MenuItem item) {

        }
    };
}```

Answer 1

所以你通过底部导航栏调用片段所以对于底部导航中的每个项目选择你确实想要刷新片段在开始事务时使用 attach() 和 detach() 方法。 每次都刷新