Android 自定义AlertDialog 并且4个角为圆角

//自定义AlertDialog
LayoutInflater inflater = getLayoutInflater();
View view1 = inflater.inflate(R.layout.dialog_activity, null);
ImageView ivguanbi = view1.findViewById(R.id.iv_guanbi);
TextView wjmm = view1.findViewById(R.id.tv_wjmm);
EditText namephone = view1.findViewById(R.id.et_namephone);
EditText newpassword = view1.findViewById(R.id.et_newpassword);
EditText yanzhenma = view1.findViewById(R.id.yanzhenma);
Button cxhqyzm = view1.findViewById(R.id.btn_nxhqyzm);
//给textview字体加粗
TextPaint paint = wjmm.getPaint();
paint.setFakeBoldText(true);
显示AlertDialogAlertDialog dialog = new AlertDialog.Builder(this)
        .setView(view1)
        .show();
//给AlertDialog设置4个圆角
dialog.getWindow().setBackgroundDrawableResource(R.drawable.dialogbg);

设置dialogbg或者说设置圆角并填充背景色或者说设置shape
xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">

    <corners android:radius="30dp" />

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

shape>

AlertDialog自定义xml布局代码如下：

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/dialogbg"
    android:orientation="vertical"
    android:padding="30dp">

    <ImageView
        android:id="@+id/iv_guanbi"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:src="@mipmap/btn_close" />

    <TextView
        android:id="@+id/tv_wjmm"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:gravity="center"
        android:text="忘记密码"
        android:textColor="@color/colorBlack"
        android:textSize="25sp" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="用户名："
        android:textSize="12sp" />

    <EditText
        android:id="@+id/et_namephone"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:layout_marginBottom="10dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:background="@drawable/list_insert"
        android:gravity="center"
        android:hint="注册所用手机号" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="新密码："
        android:textSize="12sp" />

    <EditText
        android:id="@+id/et_newpassword"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:layout_marginBottom="10dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:background="@drawable/list_insert"
        android:gravity="center"
        android:inputType="textPassword" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="验证码："
        android:textSize="12sp" />

    <EditText
        android:id="@+id/yanzhenma"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:layout_marginBottom="20dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:background="@drawable/list_insert"
        android:gravity="center" />

    <Button
        android:id="@+id/btn_nxhqyzm"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/bg"
        android:text="从新或取验证码"
        android:textColor="@color/colorWhite" />
LinearLayout>