how to resize an image inside a button

I am trying to create a button in which text description comes at bottom and an image at the top.I saw buttons can do the trick by android:drawableTop attribute but I am unable to resize the image

Methods like adjustViewBounds, android:scaleType="fitCenter", fitXY are not working.

Here is my xml code for the button

<Button
            android:text="Start Running"
            android:layout_height="match_parent"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:id="@+id/run"
            android:onClick = "RUN"
            android:scaleType="fitCenter"
            android:drawableTop="@drawable/runner"
            android:layout_marginBottom="3sp"
            android:layout_marginLeft="2sp"
            android:layout_marginRight="3sp"
            android:layout_marginTop="0sp"
            />

Please suggest something?