AlertDialog对话框-自定义View

package com.zdsoft.dialog1130;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private Button bt_show;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        bt_show.setOnClickListener(new View.OnClickListener() {
            View myView = LayoutInflater.from(MainActivity.this).inflate(R.layout.dialog_view, null);
            EditText et_user = (EditText) myView.findViewById(R.id.et_user);
            EditText et_password = (EditText) myView.findViewById(R.id.et_password);

            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setIcon(R.mipmap.ic_launcher);
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, et_user.getText().toString(), Toast.LENGTH_SHORT).show();
                    }
                });
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, "取消", Toast.LENGTH_SHORT).show();
                    }
                });

                AlertDialog dialog = builder.create();
                dialog.setTitle("用户登录");
                dialog.setView(myView);
                dialog.show();
            }
        });
    }

    private void initView() {
        bt_show = (Button) findViewById(R.id.bt_show);

    }
}