导航抽屉项目单击侦听器不起作用

Question

抱歉，我是 android studio 的业余爱好者，现在正在学习这个愚蠢的问题。 我已经尝试了很多，但点击监听器不起作用，请帮忙。 我使用了 android studio 的默认抽屉布局。导航正在工作，但我想执行特殊操作，例如使用新意图打开另一个应用程序。我正在尝试在 ID nav_link 上使用它来执行一个简单的 toast，但它不起作用。

package com.demo.navdraw;
import android.content.ClipData;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import android.widget.Toast;



import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.navigation.NavigationView;
import com.google.android.material.snackbar.Snackbar;

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

private AppBarConfiguration mAppBarConfiguration;
private MenuItem item;

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    getMenuInflater().inflate(R.menu.activity_main_drawer, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();


    if (id == R.id.nav_link) {
        Toast.makeText(this, "Setting", Toast.LENGTH_LONG).show();
        return true;
    }

    return super.onOptionsItemSelected(item);
}


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar=findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    FloatingActionButton fab=findViewById(R.id.fab);



    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });



    DrawerLayout drawer=findViewById(R.id.drawer_layout);
    NavigationView navigationView=findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
    // Passing each menu ID as a set of Ids because each
    // menu should be considered as top level destinations.
    mAppBarConfiguration=new AppBarConfiguration.Builder(
            R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow,
            R.id.nav_tools, R.id.nav_share, R.id.nav_send, R.id.nav_profile, R.id.nav_link)
            .setDrawerLayout(drawer)
            .build();
    NavController navController=Navigation.findNavController(this, R.id.nav_host_fragment);
    NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
    NavigationUI.setupWithNavController(navigationView, navController);


}

@Override
public boolean onSupportNavigateUp() {
    NavController navController=Navigation.findNavController(this, R.id.nav_host_fragment);
    return NavigationUI.navigateUp(navController, mAppBarConfiguration)
            || super.onSupportNavigateUp();
}


@Override
public boolean onNavigationItemSelected(@NonNull MenuItem Item) {
    int id=item.getItemId();

    if (id==R.id.nav_link){

            Toast.makeText(getApplicationContext(), "Link", Toast.LENGTH_LONG).show();
            return true;

        }
    return true;
    }


}

Answer 1

你可以试试这个，你需要手动做一些事情，但这就是做你想做的事情的代价。这是你需要做的：

1. 删除NavigationView.OnNavigationItemSelectedListener的实现，就不需要了
2. 调用后：

NavigationUI.setupWithNavController(navigationView, navController);

插入这个sn-p：

navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
                int id=menuItem.getItemId();
                //it's possible to do more actions on several items, if there is a large amount of items I prefer switch(){case} instead of if()
                if (id==R.id.nav_home){
                    Toast.makeText(getApplicationContext(), "Home", Toast.LENGTH_SHORT).show();
                }
                //This is for maintaining the behavior of the Navigation view
                NavigationUI.onNavDestinationSelected(menuItem,navController);
                //This is for closing the drawer after acting on it
                drawer.closeDrawer(GravityCompat.START);
                return true;
            }
        });

我已经为主页片段制作了自己的片段，但您可以使用自己的“链接”片段来完成 注意变量名是可以改变的，但思路是一样的

Answer 2

为此，您可以采用两种方法。
第一种方法
当您只想为导航抽屉中的单个项目实现侦听器时，将使用 setOnMenuItemClickListener。这会为导航抽屉中的单个项目添加一个侦听器，而不会影响其他导航项目。

 val navigationView: NavigationView = findViewById(R.id.nav_view) as NavigationView

    navigationView.menu!!.findItem(R.id.nav_logout).setOnMenuItemClickListener { menuItem:MenuItem? ->
        //write your implementation here
        //to close the navigation drawer
        if (drawer_layout.isDrawerOpen(GravityCompat.START)) {
            drawer_layout.closeDrawer(GravityCompat.START)
        }
        Toast.makeText(applicationContext, "single item click listener implemented", Toast.LENGTH_SHORT).show()
        true
    }

第二种方法
当您想为导航抽屉中的每个项目编写侦听器时，将使用 setNavigationItemSelectedListener。

val navigationView: NavigationView = findViewById(R.id.nav_view) as NavigationView
 navigationView.setNavigationItemSelectedListener { menuItem ->
    when (menuItem.itemId) {
        R.id.nav_gallery -> {
            //write your implementation here
            if (drawer_layout.isDrawerOpen(GravityCompat.START)) {
                drawer_layout.closeDrawer(GravityCompat.START)
            }
            true
        }
        else -> {
            if (drawer_layout.isDrawerOpen(GravityCompat.START)) {
                drawer_layout.closeDrawer(GravityCompat.START)
            }
            false
        }
    }
}

Answer 3

对于 Kotlin，

   bottom_navigation.setOnItemSelectedListener {

        when(it.itemId) {
            R.id.page_1 -> {
                // Respond to navigation item 1 click
                Toast.makeText(this,"Home Clicked",Toast.LENGTH_SHORT).show()
                true
            }
            R.id.page_2 -> {
                // Respond to navigation item 2 click
                true
            }
            R.id.page_3 -> {
                // Respond to navigation item 2 click
                true
            }
            R.id.page_4 -> {
                // Respond to navigation item 2 click
                true
            }

            else -> false
        }
    }

.OnNavigationItemSelectedListener 被贬低

Answer 4

这里有两种导航项点击的方式

第一种方式：- 如果您想在点击导航抽屉项目后显示片段，那么您可以按照一些简单的步骤来实现。

• 您必须创建一个导航图。更多信息Click here

• 菜单项和导航图中的片段的id必须相同。

查看此图片：- Menu Item ID

查看此图片：- Navigation Graph - Fragment ID

DrawerLayout drawer = binding.drawerLayout;
    NavigationView navigationView = binding.navView;
    // Passing each menu ID as a set of Ids because each
    // menu should be considered as top level destinations.
    mAppBarConfiguration = new AppBarConfiguration.Builder(
            R.id.home, R.id.gallery, R.id.nav_slideshow)
            .setOpenableLayout(drawer)
            .build();
    NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main3);
    NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
    NavigationUI.setupWithNavController(navigationView, navController);

当两个 id 相同时，您的 Navigation View 将根据 id 处理您的导航项点击。

第二种方式：- 如果您想在单击导航抽屉项后显示自定义内容，则可以实现导航项单击侦听器。

navigationView.setNavigationItemSelectedListener(item -> {
        if (item.getItemId()==R.id.home){
            // your code
            Toast.makeText(this, "Clicked..", Toast.LENGTH_SHORT).show();
            drawer.close();
            return true;
        }
        return false;
    });