我可以禁止在特定逻辑的BottomNavigationView项目中移动吗？

Question

目前我有像这个 -

mBottomNav.setOnNavigationItemSelectedListener(
       ...... 
    switch (item.getItemId()) { 

     case R.id.actionUser: 
      if(userLoggedIn) { 
       mHomePresenter.btnUser(); 
      } 
      else { 
       showLongToast("User Not Logged In"); 
      } 
      break; 
    }); 

逻辑其他部分的实现，我将显示敬酒消息，无论是我想要的BottomNavigationView转移也没有菜单图标的颜色变化。

如何才能在这个特定的部分实现这样的逻辑？所有其他菜单项将保持默认的切换逻辑。

Answer 1

那么答案很简单，对于条件你要过渡到发生，因为你不想返回false

以你的代码考虑条件返回true，它应该是

mBottomNav.setOnNavigationItemSelectedListener(
    @Override 
    public boolean onNavigationItemSelected(@NonNull MenuItem item) { 
     switch (item.getItemId()) { 
     case R.id.actionUser: 
      if(userLoggedIn) { 
       mHomePresenter.btnUser(); 
       return true; 
      } 
      else { 
       showLongToast("User Not Logged In"); 
       return false; 
      } 
     } 
    }); 

如果检查导航选择监听器的文件，你可以看到

/** 
* Listener for handling selection events on bottom navigation items. 
*/ 
public interface OnNavigationItemSelectedListener { 

    /** 
    * Called when an item in the bottom navigation menu is selected. 
    * 
    * @param item The selected item 
    * 
    * @return true to display the item as the selected item and false if the item should not 
    *   be selected. Consider setting non-selectable items as disabled preemptively to 
    *   make them appear non-interactive. 
    */ 
    boolean onNavigationItemSelected(@NonNull MenuItem item); 
}