app:cornerRadius is not working in android material design button

Question

How to change corner radius of android material button. I tried setting corner radius but its not working.

<com.google.android.material.button.MaterialButton
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:background="@color/colorPrimary"
                android:text="Start"
                android:textColor="@android:color/white"
                android:textSize="18sp"
                app:cornerRadius="8dp" />

Answer 1

you need to set the style of Button like below

and to use Material Design you need to add below dependencies in gradle.

dependencies { implementation ‘com.google.android.material:material:1.1.0’ }

XML

<com.google.android.material.button.MaterialButton

   style="@style/Widget.MaterialComponents.Button"
   app:cornerRadius="8dp"/>