[已解决]setOnNavigationItemSelectedListener()被弃用

在我开发app的过程中，我用了setOnNavigationItemSelectedListener()这个对象，但是我现在遇到了问题

setOnNavigationItemSelectedListener(com.google.android.material.bottomnavigation.BottomNavigationView.OnNavigationItemSelectedListener)

被弃用，所以下面向你解释可能的解决方法。

怎么解决setOnNavigationItemSelectedListener被弃用导致的问题？

你可以尝试使用setonItemSelectedListener，它的用法和setOnNavigationItemSelectedListener()是相同的

方法一：用setonItemSelectedListener替换

java样例:

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

kotlin样例:

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

java样例demo

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;

import android.os.Bundle;
import android.view.MenuItem;
import android.widget.TextView;

import com.google.android.material.navigation.NavigationBarView;
import com.xxx.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {
    

    NavigationBarView navigationBarView;

    private ActivityMainBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
        super.onCreate(savedInstanceState);

        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        navigationBarView = findViewById(R.id.bottom);

        if (savedInstanceState == null){
    
            getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, new HomeFragment()).commit();
        }

        navigationBarView.setOnItemSelectedListener(new NavigationBarView.OnItemSelectedListener() {
    
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    
                Fragment fragment = null;
                switch (item.getItemId()){
    
                    case R.id.index:
                        fragment = new HomeFragment();
                        break;
                    case R.id.vip:
                        fragment = new ShoppingFragment();
                        break;
                    case R.id.User:
                        fragment = new UserFragment();
                        break;
                }
                getSupportFragmentManager().beginTransaction().replace(R.id.fragmentContainer, fragment).commit();
                return true;
            }
        });
    }
}

方法二：使用基类

  /** * 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;
  }

以上是关于这个问题的所有解决方法，希望对你有所帮助。可以在评论区留下你的想法，也可以说一下哪个对你有用。