constraintlayout中的textview显示不出来

[NanayaHaruki]

<androidx.constraintlayout.widget.ConstraintLayout>
<TextView
            android:id="@+id/tv_feature_unread_cnt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            app:layout_constraintHorizontal_bias="0.75"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

这种targetView.getLayoutParams();似乎拿不到bias属性？