Android自定义AlertDialog对话框样式

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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();
    }
  }
}