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"/>