I know this may strike out as a dumb question but i bet some of you had this problem before.From the screenshot,i am attempting to set an image in an activity.However my image brings up these spaces i dont know how to get rid of them.I mean is there a way,either in xml or to programmatically resize image to fit the height and width?In short,is there a way i can get rid of these spaces above and below?

My xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.snappy.stevekamau.cosmeticsapp.Categories.Lips">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="@+id/app_bar"
layout="@layout/app_bar"></include>
<ImageView
android:id="@+id/imageTop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/white_rectangle"
android:src="@drawable/img4" />
<TextView
android:text="@string/hello_world" android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</RelativeLayout>