How to remove padding around buttons in Android?
For me the problem turned out to be minHeight and minWidth on some of the Android themes.
On the Button element, add:
<Button android:minHeight="0dp" android:minWidth="0dp" ...Or in your button's style:
<item name="android:minHeight">0dp</item><item name="android:minWidth">0dp</item>
My solution was set to 0 the insetTop and insetBottom properties.
<android.support.design.button.MaterialButton android:layout_width="match_parent" android:layout_height="wrap_content" android:insetTop="0dp" android:insetBottom="0dp" android:text="@string/view_video" android:textColor="@color/white"/>