android decrease button size code example

Example 1: android button make wider

You can use paddings.
Exaples:
android:paddingEnd="55dp"(+55dp to the right border)
android:padding="35dp"

Example 2: button size minimize in android

You can achieve this by setting android:minHeight="0dp" for the Button widget. And I guess this behavior is because there is some default value (may be a 48dp) set for Button widgets by the framework considering a minimum touch area