Image layout android

There is my layout in android xml, but the image does not in the top of the layout. What can be the problem?

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

<LinearLayout xmlns:android="http://ift.tt/nIICcg"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <ScrollView android:layout_width="match_parent"
                android:layout_height="match_parent">

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

            <ImageView android:id="@+id/description_imageview"
                       android:layout_width="match_parent"
                       android:layout_height="wrap_content"
                       android:src="@drawable/hand"
                       android:contentDescription="@string/app_version"/>

            <TextView android:id="@+id/first_help_textview"
                      android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:text="sdsjkfhsdjkfhsdkjfh skdfjh skjdfh skdjfh skjdfh skjdfh skjdhfk jshdfkjh  jskdfh skjdfh skdjfh skdjfh skdjfh skjdfh skjdfh skjdfh kjsdhf kjsdhfk jhs"/>
        </LinearLayout>
    </ScrollView>
</LinearLayout>

add scale_type: