java - 不推荐使用 setOnNavigationItemSelectedListener

Question

目前我正在开发一个底部导航栏和三个菜单项的应用程序。我曾用于setOnNavigationItemSelectedListener()被点击的项目。但现在我面临该方法已贬值的问题。

• 应用语言：Java
• 问题：'setOnNavigationItemSelectedListener(com.google.android.material.bottomnavigation.BottomNavigationView.OnNavigationItemSelectedListener)' is deprecated

有什么办法可以解决吗？有没有比setOnNavigationItemSelectedListener()方法更好的选择。

Answer 1

根据 github 来源已弃用它：BottomNavigationView.setOnNavigationItemSelectedListener

在其评论中，您可以阅读：

@deprecated Use {@link NavigationBarView#setOnItemSelectedListener(OnItemSelectedListener)}
   *     instead.

所以从它的基类中使用NavigationBarView.setOnItemSelectedListener ：

  /**
   * Set a listener that will be notified when a navigation item is selected. This listener will
   * also be notified when the currently selected item is reselected, unless an {@link
   * OnItemReselectedListener} has also been set.
   *
   * @param listener The listener to notify
   * @see #setOnItemReselectedListener(OnItemReselectedListener)
   */
  public void setOnItemSelectedListener(@Nullable OnItemSelectedListener listener) {
    selectedListener = listener;
  }

另请参阅此提交

因为它解释了对这种变化的困惑：

监听器被弃用，取而代之的是 NavigationBarView#OnItemSelectedListenerand NavigationBarView#OnItemReselectedListener，但从未添加过弃用文档，因此不清楚开发人员应该改用什么。

Answer 2

你可以试试setonItemSelectedListener。它的工作原理与setOnNavigationItemSelectedListener()[在 android 11 中测试]相同

bnv.setOnItemSelectedListener(new NavigationBarView.OnItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            int id = item.getItemId();
            switch(id){
              //check id
            }
            return true;
        }
    });

科特林：

bnv.setOnItemSelectedListener { item ->
            when (item.itemId) {
            }
            true
        }

Answer 3

我们可以使用setOnItemSelectedListener代替setOnNavigationItemSelectedListener和 setOnItemReselectedListener代替setOnNavigationItemReselectedListener

navView.setOnItemSelectedListener {
    // do something
    true
}

// In case the default menu can be the first menu 
// Should set the default selected menu BETWEEN setOnItemSelectedListener and setOnItemReselectedListener. 
// It will make setOnItemSelectedListener fired when you launch app. 

// If you set default menu AFTER setOnItemReselectedListener. 
// Then setOnItemReselectedListener will fired when you launch app
navView.selectedItemId = R.id.navigation_home


navView.setOnItemReselectedListener {
    // do something
}

Answer 4

 viewBindingMainActivity.navView.setOnItemSelectedListener { menuItem ->
            if (menuItem.itemId != R.id.navigation_home) {
                Add your code
                false
            } else {
                Add your code
                true
            }
        }