TabLayout 均分

 <com.google.android.material.tabs.TabLayout
            android:id="@+id/tab_layout"
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:background="@color/white"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/normalHead"
            app:tabMaxWidth="0dp"
            app:tabIndicatorColor="@color/black"
            app:tabIndicatorFullWidth="true"
            app:tabIndicatorHeight="2dp"
            app:tabMode="fixed"
            app:tabGravity="fill"
            app:tabSelectedTextColor="@color/black"
            app:tabTextColor="@color/gray"
            app:tabUnboundedRipple="true" />

app:tabMode="fixed"
app:tabGravity="fill"