/* 创建AlertDialog对象并显示 */

            final AlertDialog alertDialog = new AlertDialog.Builder(LoginActivity.this).create();

            alertDialog.show();

        /* 添加对话框自定义布局 */           
            alertDialog.setContentView(R.layout.dialog_login);

        /* 获取对话框窗口 */

            Window window = alertDialog.getWindow();

        /* 设置显示窗口的宽高 */          
            window.setLayout(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);

        /* 设置窗口显示位置 */

            window.setGravity(Gravity.CENTER);

        /* 通过window找布局里的控件 */

            window.findViewById(R.id.login).setOnClickListener(new View.OnClickListener() {

                @Override

                public void onClick(View v) {

                    Log.e("log", "进入onclick函数体内");

                    // 隐藏对话框

                    alertDialog.dismiss();

                    //自己进行其他的处理

                }

            });

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout android:layout_height="wrap_content"

    android:layout_width="match_parent"

    android:orientation="vertical"

    android:background="@drawable/dialog_corner_bg"

    android:layout_margin="20dp"   
    xmlns:android="http://schemas.android.com/apk/res/android">

    <Button

        android:padding="5dp"

        android:layout_marginBottom="5dp"

        android:id="@+id/login"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:background="@null"

        android:text="OK"

        android:textColor="@color/btn_txt_blue"

        android:textSize="25sp"

        android:textStyle="bold" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<!-- 用于设置信息对话框的圆角 -->

<shape xmlns:android="http://schemas.android.com/apk/res/android">

    <corners android:radius="20dip"></corners>

    <solid android:color="@color/white"></solid>

</shape>

                final Dialog dialog2 = new Dialog(LoginActivity.this, R.style.ActionSheetDialogStyle);

                LinearLayout view = (LinearLayout) LayoutInflater.from(LoginActivity.this).inflate(R.layout.dialog_forgotpwd, null);

                TextView dismiss = (TextView) view.findViewById(R.id.btn_dismiss);

                TextView forgotPin = (TextView) view.findViewById(R.id.btn_forgotpin);

                TextView forgotPassword = (TextView) view.findViewById(R.id.btn_forgotpassword);

                dismiss.setOnClickListener(new View.OnClickListener() {

                    @Override

                    public void onClick(View v) {

                        dialog2.dismiss();

                    }

                });

                forgotPin.setOnClickListener(new View.OnClickListener() {

                    @Override

                    public void onClick(View v) {

                    }

                });

                forgotPassword.setOnClickListener(new View.OnClickListener() {

                    @Override

                    public void onClick(View v) {

                    }

                });

                dialog2.setContentView(view);

                Window dialogWindow = dialog2.getWindow();

                dialogWindow.setGravity(Gravity.BOTTOM);

                WindowManager.LayoutParams lp = dialogWindow.getAttributes();

                lp.y = 30; //距离底部的高度

                dialogWindow.setAttributes(lp);

                dialog2.show();

<style name="ActionSheetDialogStyle" parent="@android:style/Theme.Dialog">

        <!-- 背景透明 -->

        <item name="android:windowBackground">@drawable/email_dialogfrag_bg</item>

        <item name="android:windowContentOverlay">@null</item>

        <!-- 浮于Activity之上 -->

        <item name="android:windowIsFloating">true</item>

        <!-- 边框 -->

        <item name="android:windowFrame">@null</item>

        <!-- Dialog以外的区域模糊效果 -->

        <item name="android:backgroundDimEnabled">true</item>

        <!-- 无标题 -->

        <item name="android:windowNoTitle">true</item>

        <!-- 半透明 -->

        <item name="android:windowIsTranslucent">true</item>

        <item name="android:color">@color/white</item>

    </style>