it still doesn"t work to use the android:clipChildren= "false" attribute. Here are the needed renderings and layout code. The only thing missing is the raised dot

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:clipChildren="false"
    android:layout_height="match_parent">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scaleType="fitXY"
        android:src="@mipmap/login_background" />

    <android.support.v7.widget.CardView
        android:id="@+id/cv_login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="12dp"
        android:layout_marginRight="12dp"
        android:orientation="vertical"
        app:cardCornerRadius="10dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:clipChildren="false"
        app:layout_constraintTop_toTopOf="parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:src="@mipmap/login_circle"/>

            <EditText
                android:id="@+id/et_account"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint=""
                android:padding="10dp"
               android:layout_marginLeft="13dp"
                android:layout_marginRight="13dp"
                android:background="@drawable/login_shape"
                android:singleLine="true" />

            <EditText
                android:id="@+id/et_password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:hint=""
                android:layout_marginLeft="13dp"
                android:layout_marginRight="13dp"
                android:layout_marginTop="10dp"
                android:padding="10dp"
                android:background="@drawable/login_shape"
                android:inputType="textPassword"
                android:singleLine="true" />

            <RelativeLayout
                android:layout_width="match_parent"
                android:padding="20dp"
                android:layout_height="wrap_content">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="?"/>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentRight="true"
                    android:text=">"/>

            </RelativeLayout>

        </LinearLayout>

    </android.support.v7.widget.CardView>

    <Button
        android:id="@+id/btn_login"
        app:layout_constraintTop_toBottomOf="@id/cv_login"
        android:layout_width="match_parent"
        android:layout_margin="12dp"
        android:textColor="@color/colorWhite"
        android:layout_height="wrap_content"
        android:background="@drawable/login_buton_shape"
        android:text="@string/login"/>

    <LinearLayout
        app:layout_constraintTop_toBottomOf="@id/btn_login"
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_margin="12dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="-sharp999999"
            android:text=""/>

        <TextView
            android:id="@+id/tv_user_deal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=""/>

    </LinearLayout>

</android.support.constraint.ConstraintLayout>