Magic Cube

            <ImageButton

                android:id="@+id/buttonSettings"

                android:adjustViewBounds="true"

                android:scaleType="fitCenter"

                android:layout_width="wrap_content"

                android:layout_height="match_parent"

                android:onClick="onSettings"

                android:background="@android:color/transparent"

                android:src="@drawable/ui_settings"/>