image inside swipe button cannot be enlarged

[vikash7325]

<com.ebanx.swipebtn.SwipeButton android:id="@+id/swipeButton1" android:layout_width="304dp" android:layout_height="44dp" android:layout_marginStart="8dp" android:layout_marginLeft="8dp" android:layout_marginEnd="8dp" android:layout_marginRight="8dp" app:button_image_disabled="@drawable/ic_sad" app:button_image_enabled="@drawable/ic_happy" app:inner_text="@string/swipe_to_contribute" app:inner_text_background="@drawable/shape_rounded" app:button_left_padding="20dp" app:button_right_padding="20dp" app:button_bottom_padding="20dp" app:button_top_padding="20dp" app:button_background="@drawable/shape_button" app:inner_text_size="16dp" />

This app:button_image_disabled="@drawable/ic_sad" Image ic_sad is coming as very small. I can't make it big even by using button_image_height. please suggest