Android对话框动态加载布局

项目结构：

MainActivity:

package com.example.demo_three;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        findViewById(R.id.button).setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "click", Toast.LENGTH_SHORT).show();
                LayoutInflater inflater=MainActivity.this.getLayoutInflater();
                View dialog=inflater.inflate(R.layout.dialog_view,null);
                AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
                builder.setIcon(R.drawable.u)
                        .setTitle("用户登录")
                        .setView(dialog)
                        .setPositiveButton("登录", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_SHORT).show();
                            }
                        });
                builder.create().show();
            }
        });
    }
}

package