package com.example.projectdesign;
    import androidx.annotation.NonNull;
    import androidx.appcompat.app.ActionBarDrawerToggle;
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.core.view.GravityCompat;
    import androidx.drawerlayout.widget.DrawerLayout;
    import androidx.fragment.app.Fragment;
         import android.annotation.SuppressLint;
      import android.app.Activity;
     import android.content.Intent;
     import android.os.Bundle;
     import android.view.MenuItem;
    import android.widget.Toast;

    import com.google.android.material.navigation.NavigationView;

    public class MenuDrawer extends AppCompatActivity implements 
    NavigationView.OnNavigationItemSelectedListener{
    public DrawerLayout drawerLayout;
    public ActionBarDrawerToggle actionBarDrawerToggle;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu_drawer);

        drawerLayout = findViewById(R.id.my_drwaer_layout);
        actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, 
      R.string.nav_open, R.string.nav_close);
        drawerLayout.addDrawerListener(actionBarDrawerToggle);
        actionBarDrawerToggle.syncState();
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        NavigationView navigationView = findViewById(R.id. nav_view ) ;
        navigationView.setNavigationItemSelectedListener( this ) ;
    }
    @SuppressLint("ResourceType")
    @SuppressWarnings ( "StatementWithEmptyBody" )
     @Override
    public boolean onNavigationItemSelected (MenuItem item){
        int id=item.getItemId();
        switch (id){
            case R.id.nav_account:
                Intent intent= new Intent(MenuDrawer.this, UsingBackKey.class);
                startActivity(intent);
                break;
            case R.id.women:
     
     
    getSupportFragmentManager().beginTransaction().replace(R.id.my_drwaer_layout,new 
    Fragment2()).commit();
                break;
            case R.id.men:
                Toast.makeText(getApplicationContext(),"Soon", 
   Toast.LENGTH_SHORT).show();
                break;
            case R.id.kids:
              Toast.makeText(getApplicationContext(),"Welcome to Kids", 
      Toast.LENGTH_SHORT).show();
                break;
        }
        drawerLayout.closeDrawer(GravityCompat.START);
        return super.onContextItemSelected(item);
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {


        if (actionBarDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }

        return super.onOptionsItemSelected(item);

    }

    @Override
    public void onBackPressed() {
        if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
            drawerLayout.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
        super.onBackPressed();
    }
}

API 23提供了以下方法:

navigationView.setCheckedItem(R.id.nav_item_id);

但是，由于某种原因，这个函数没有导致导航项后面的代码运行。该方法当然会突出显示导航抽屉中的项目，或“检查”它，但它似乎不会调用OnNavigationItemSelectedListener，导致启动时出现空白屏幕，如果您的启动屏幕依赖于导航抽屉的选择。可以手动调用监听器，但看起来很俗气:

if (savedInstanceState == null) this.onNavigationItemSelected(navigationView.getMenu().getItem(0));

上面的代码假设:

你已经实现了 NavigationView。OnNavigationItemSelectedListener在你的活动 您已经呼叫过: navigationView.setNavigationItemSelectedListener(这个); 您要选择的项目位于位置0

关于你的活动(在抽屉后面):

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

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar,
               R.string.navigation_drawer_open,
               R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
    navigationView.setCheckedItem(R.id.nav_portfolio);
    onNavigationItemSelected(navigationView.getMenu().getItem(0));
}

and

@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    Fragment fragment = null;

    if (id == R.id.nav_test1) {
        fragment = new Test1Fragment();
        displaySelectedFragment(fragment);
    } else if (id == R.id.nav_test2) {
        fragment = new Test2Fragment();
        displaySelectedFragment(fragment);
    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

在菜单中:

<group android:checkableBehavior="single">

    <item
        android:id="@+id/nav_test1"
        android:title="@string/test1" />

    <item
        android:id="@+id/nav_test2"
        android:title="@string/test2" />

  </group>

第一个菜单被高亮显示为默认菜单。

你也可以拨打:

navigationView.setCheckedItem(id);

此方法在API 23.0.0中引入

例子

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      tools:ignore="UnusedIds">

    <group
        android:id="@+id/group"
        android:checkableBehavior="single">
        <item
            android:id="@+id/menu_nav_home"
            android:icon="@drawable/ic_home_black_24dp"
            android:title="@string/menu_nav_home" />
    </group>
</menu>

注意:android: checkableBehavior = "单"

看这个

谷歌的“哦，太棒了”支持库总是有问题。如果你想检查一个项目而不降低你的支持库版本，只需要在设置检查状态之前设置checkable。

MenuItem item = drawer.getMenu().findItem(R.id.action_something);
item.setCheckable(true);
item.setChecked(true);

如果你在菜单xml文件中设置checkable，它也可以工作

下面的代码用于选择第一个项目并在菜单中突出显示所选的第一个项目。

onNavigationItemSelected(mNavigationView.getMenu().getItem(0).setChecked(true));