Android从导航抽屉打开AlertDialog

// 导航抽屉菜单的点击事件监听器
NavigationView.OnNavigationItemSelectedListener navigationItemSelectedListener = new NavigationView.OnNavigationItemSelectedListener() {
    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        // 判断点击的菜单项
        if (item.getItemId() == R.id.menu_item_show_dialog) {
            // 创建AlertDialog
            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
            builder.setTitle("提示");
            builder.setMessage("这是一个AlertDialog示例");
            builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // 点击确定按钮的操作
                }
            });
            builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // 点击取消按钮的操作
                }
            });

            // 显示AlertDialog
            AlertDialog alertDialog = builder.create();
            alertDialog.show();
        }
        return true;
    }
};

// 设置导航抽屉菜单的点击事件监听器
NavigationView navigationView = findViewById(R.id.navigation_view);
navigationView.setNavigationItemSelectedListener(navigationItemSelectedListener);