三个水平按钮，它们之间有一个很小的边距，使用ConstraintLayout

implementation 'androidx.constraintlayout:constraintlayout:2.1.0'

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- 添加你的按钮视图 -->

</androidx.constraintlayout.widget.ConstraintLayout>

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button 1"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintEnd_toStartOf="@+id/button2"
    app:layout_constraintHorizontal_chainStyle="spread"
    app:layout_constraintHorizontal_bias="0.5"/>

<Button
    android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button 2"
    app:layout_constraintStart_toEndOf="@+id/button1"
    app:layout_constraintEnd_toStartOf="@+id/button3"
    app:layout_constraintHorizontal_chainStyle="spread"
    app:layout_constraintHorizontal_bias="0.5"/>

<Button
    android:id="@+id/button3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button 3"
    app:layout_constraintStart_toEndOf="@+id/button2"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_chainStyle="spread"
    app:layout_constraintHorizontal_bias="0.5"/>