How to create a circular outlined Material Button in Android?

Question

I am trying to create a button with an icon in the center. The top and bottom part of the circle are a little flat. Is there a way to do this without using corner radius? Here is my layout for the button.

<com.google.android.material.button.MaterialButton
        android:id="@+id/start_dispenser_btn"
        style="@style/Widget.MaterialComponents.Button.OutlinedButton"
        android:layout_width="175dp"
        android:layout_height="175dp"
        android:padding="14dp"
        app:cornerRadius="150dp"
        app:icon="@drawable/ic_play_arrow_black_60dp"
        app:iconGravity="end"
        app:iconSize="150dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/stop_dispenser_btn"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/test_dispenser_container"
        app:strokeColor="@color/background_black" />

Answer 1

You can use the app:shapeAppearanceOverlay attribute to define the corner size. You can use the 50% value.

<com.google.android.material.button.MaterialButton
    android:layout_width="50dp"
    android:layout_height="50dp"
    style="@style/Widget.MaterialComponents.Button.OutlinedButton.Icon"
    app:icon="@drawable/ic_add_24px"
    app:iconSize="24dp"
    app:iconGravity="textStart"
    android:padding="0dp"
    app:iconPadding="0dp"
    android:insetLeft="0dp"
    android:insetTop="0dp"
    android:insetRight="0dp"
    android:insetBottom="0dp"
    app:shapeAppearanceOverlay="@style/ShapeAppearanceOverlay.MyApp.Button.Circle"
    />

with:

  <style name="ShapeAppearanceOverlay.MyApp.Button.Circle" parent="">
    <item name="cornerFamily">rounded</item>
    <item name="cornerSize">50%</item>
  </style>

or with the style="@style/Widget.MaterialComponents.Button.Icon"

It requires at least the version 1.1.0.

---

With jetpack compose you can use the OutlinedButton applying a CircleShape as shape:

    OutlinedButton(onClick = { /* ... */ },
        modifier= Modifier.size(50.dp), // it is important otherwise the button is oval
        shape = CircleShape,
        border= BorderStroke(1.dp, Color.Blue),
        contentPadding = PaddingValues(0.dp),
        colors = ButtonDefaults.outlinedButtonColors(contentColor =  Color.Blue)
    ) {
            Icon(Icons.Default.Add, contentDescription = "content description")
    }