[Solved] Boundry around a view

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Try this:

Border Line inside cardview:

 <android.support.v7.widget.CardView
        android:id="@+id/cardview0"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentTop="true">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginLeft="10dp"
            android:background="#000000">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginBottom="0.5dp"
                android:layout_marginLeft="0.5dp"
                android:layout_marginTop="0.5dp"
                android:background="#ffffff">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerVertical="true"
                    android:layout_gravity="center_vertical"
                    android:layout_marginLeft="30dp"
                    android:text="Circle"
                    android:textColor="#3B64AE" />

                <Spinner
                    android:layout_width="150dp"
                    android:layout_height="match_parent"
                    android:layout_alignParentRight="true">


                </Spinner>

            </RelativeLayout>
        </RelativeLayout>

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

Border line outside cardview:

 <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_marginLeft="5dp"
        android:background="@drawable/border_line">

        <android.support.v7.widget.CardView
            android:id="@+id/cardview0"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_margin="1dp"
            android:layout_alignParentTop="true">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="#ffffff">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerVertical="true"
                    android:layout_gravity="center_vertical"
                    android:layout_marginLeft="30dp"
                    android:text="Circle"
                    android:textColor="#3B64AE" />

                <Spinner
                    android:layout_width="150dp"
                    android:layout_height="match_parent"
                    android:layout_alignParentRight="true">


                </Spinner>

            </RelativeLayout>


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

    </RelativeLayout>

drawable -> border_line.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <stroke
        android:width="2dp"
        android:color="000000" />

</shape>

solved Boundry around a view