How do I make my ImageView a fixed size regardless of the size of the bitmap

This will fit the image in the specified height and width, irrespective of image size.

<ImageView
        android:id="@+id/image5"
        android:layout_width="300dp"
        android:layout_height="200dp"
        android:src="@drawable/image_1"
        android:scaleType="fitXY"/>

Just delete the maxHeight and maxWidth attributes and enter your units in layout_width and layout_height appropriately. But do not use the px unit - use dp instead, because these are device-independent.