<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="300dp"
  android:layout_height="180dp"
  android:orientation="vertical">
  <TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="15dp"
    android:gravity="center"
    android:text="WIFI"
    android:textSize="18sp" />
  <View
    android:layout_width="match_parent"
    android:layout_height="2dp"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="10dp"
    android:background="#F5F5F5" />
  <EditText
    android:id="@+id/et_passwd"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="10dp"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:hint="Password"
    android:inputType="numberPassword" />
  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:orientation="horizontal">
    <Button
      android:id="@+id/btn_cancel"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_weight="1"
      android:background="@null"
      android:text="取消"
      android:textColor="#1965db"
      android:textSize="16sp" />
    <Button
      android:id="@+id/btn_connect"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_weight="1"
      android:background="@null"
      android:text="连接"
      android:textColor="#1965db"
      android:textSize="16sp" />
  </LinearLayout>
</LinearLayout>

package com.example.test.dialogtest;
import android.app.AlertDialog;
import android.content.Context;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
/**
 * Created by AaronPasi on 2017/9/16.
 */
public class WifiDialog extends AlertDialog implements View.OnClickListener {
  EditText mEtPasswd;
  Button mBtnCancel, mBtnConnect;
  Context mContext;
  public WifiDialog(Context context) {
    super(context);
    mContext = context;
  }
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.dialog_layout);
    mEtPasswd = (EditText) findViewById(R.id.et_passwd);
    //保证EditText能弹出键盘
    this.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
    this.setCancelable(false);
    mBtnCancel = (Button) findViewById(R.id.btn_cancel);
    mBtnCancel.setOnClickListener(this);
    mBtnConnect = (Button) findViewById(R.id.btn_connect);
    mBtnConnect.setOnClickListener(this);
  }
  @Override
  public void onClick(View view) {
    switch (view.getId()) {
      case R.id.btn_cancel:
        this.dismiss();
        break;
      case R.id.btn_connect:
        if (TextUtils.isEmpty(mEtPasswd.getText())) {
          Toast.makeText(mContext, "密码不能为空", Toast.LENGTH_SHORT).show();
        } else {
          this.dismiss();
          Toast.makeText(mContext, mEtPasswd.getText().toString(), Toast.LENGTH_SHORT).show();
        }
        break;
      default:
        break;
    }
  }
}

package com.example.test.dialogtest;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
  private Button mDialogBtn;
  private WifiDialog mDialog;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mDialogBtn = (Button) findViewById(R.id.btn_dialog);
    mDialogBtn.setOnClickListener(this);
  }
  @Override
  public void onClick(View view) {
    if (view.getId() == R.id.btn_dialog) {
      mDialog = new WifiDialog(this);
      mDialog.show();
    }
  }
}