app:layout_constraintHorizontal_chainStyle
app:layout_constraintDimensionRatio
<Button android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintDimensionRatio="H,16:9" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintTop_toTopOf="parent"/>
app:layout_constraintHorizontal_bias
<ImageView android:id="@+id/up_down_image" android:src="@mipmap/ic_triangle_black" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintHorizontal_bias="0.55" app:layout_constraintTop_toTopOf="@id/select_class" app:layout_constraintBottom_toBottomOf="@id/select_class" app:layout_constraintLeft_toRightOf="@id/bg" app:layout_constraintRight_toLeftOf="@id/bg"/>
app:layout_constraintWidth_percent 与 app:layout_constraintHeight_percent
<TextView android:id="@+id/text_noon" android:text="demo" android:textSize="@dimen/font_size_14" android:textColor="@color/fontBlack3" android:background="@color/colorGreen" android:gravity="center" android:layout_width="0dp" android:layout_height="match_parent" android:layout_marginTop="15dp" android:layout_marginBottom="15dp" app:layout_constraintHorizontal_bias="0.90" app:layout_constraintWidth_percent="0.20" app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintLeft_toLeftOf="parent"/>
app:layout_constrainedWidth
constraintlayout.widget.Barrier
<androidx.constraintlayout.widget.Barrier android:layout_width="wrap_content" android:layout_height="wrap_content" app:barrierDirection="left" app:constraint_referenced_ids="up_down_image" app:layout_constraintTop_toTopOf="@id/bg" app:layout_constraintBottom_toBottomOf="@id/bg" app:layout_constraintRight_toLeftOf="@id/up_down_image"/>
constraintlayout.widget.Guideline
<androidx.constraintlayout.widget.Guideline android:id="@+id/guideline1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" app:layout_constraintGuide_percent="0.04"/>
constraintlayout.widget.Group
<androidx.constraintlayout.widget.Group android:id="@+id/group" android:layout_width="wrap_content" android:layout_height="wrap_content" android:visibility="gone" app:constraint_referenced_ids="line,whether,opinion" app:layout_constraintTop_toBottomOf="@id/name" app:layout_constraintLeft_toLeftOf="parent"/>
Space
<Space android:layout_width="0dp" android:layout_height="20dp" app:layout_constraintTop_toBottomOf="@id/opinion" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent"/>