setOnNavigationItemSelectedListener已弃用

Question

目前我正在开发一个带有三个菜单项的底部导航栏的应用程序。我曾使用setOnNavigationItemSelectedListener（）来单击项目。但现在我面临的问题是该方法已贬值。

• 应用程序语言：Java
• 问题：“setOnNavigationItemSelectedListener（com.google.android.material.bottomnavigation.BottomNavigationView.OnNavigationItemSelectedListener）”已被弃用

有什么办法解决吗？有没有比setOnNavigationItemSelectedListener（）更好的方法呢。

Answer 1

我们可以使用setOnItemSelectedListener代替setOnNavigationItemSelectedListener，也可以使用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 2

您可以尝试设置OnItemSelectedListener。其工作原理与setOnNavigationItemSelectedListener（）相同

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

静态编程语言：

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

Answer 3

根据github来源，它已弃用：BottomNavigationView.setOnNavigationItemSelectedListener

在其评论中，您可以阅读：

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

因此，请使用NavigationBarView。setOnItemSelectedListener的基类：

  /**
   * 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;
  }

也看到这个提交

正如它解释了关于这一变化的困惑：

监听器被弃用，取而代之的是导航栏视图（NavigationBarView）#OnItemSelectedListener（OnItemSelectedListener）和导航栏视图（NavigationBarView）#OnItemReselectedListener（OnItemReselectedListener），但从未添加弃用文档，因此不清楚开发人员应该使用什么替代。