一、运行效果：

二、主函数MainActivity.java:

package com.example.a081_drawerapp;

import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;

import android.graphics.Color;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

import androidx.appcompat.widget.Toolbar;

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

public class MainActivity extends AppCompatActivity {

    private DrawerLayout drawerLayout;
    private Toolbar toolbar;
    private Toolbar supportActionBar;
    private NavigationView navigationView;

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