固定一边，中间宽度可变，另一边跟随中间尾部

1. 固定一边，中间宽度可变，另一边跟随中间尾部

设计需求：头像位置固定，中间文字长度可变，最右侧按钮跟在文字右侧，但不能超出屏幕。

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="60dp"
      tools:background="@color/background_gray">

      <ImageView
          android:id="@+id/iv_avatar"
          android:layout_width="40dp"
          android:layout_height="40dp"
          android:layout_marginStart="15dp"
          app:layout_constraintBottom_toBottomOf="parent"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintHorizontal_bias="0"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintTop_toTopOf="parent"
          tools:srcCompat="@tools:sample/avatars[2]" />

      <TextView
          android:id="@+id/tv_text"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_marginStart="15dp"
          android:layout_marginEnd="15dp"
          android:singleLine="true"
          app:layout_constrainedWidth="true"
          app:layout_constraintBottom_toBottomOf="@+id/iv_avatar"
          app:layout_constraintEnd_toStartOf="@id/tv_action"
          app:layout_constraintHorizontal_bias="0"
          app:layout_constraintHorizontal_chainStyle="packed"
          app:layout_constraintStart_toEndOf="@id/iv_avatar"
          app:layout_constraintTop_toTopOf="@+id/iv_avatar"
          tools:text="ConstraintLayout is available as a support library" />

      <TextView
          android:id="@+id/tv_action"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_marginEnd="15dp"
          app:layout_constraintBottom_toBottomOf="@+id/iv_avatar"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintStart_toEndOf="@id/tv_text"
          app:layout_constraintTop_toTopOf="@+id/iv_avatar"
          tools:text="查看" />


</androidx.constraintlayout.widget.ConstraintLayout>