在引入控件EditText时，在虚拟器中显示不出来
例如如下代码<EditText android:id="@+id/edit_text" android:layout_width="match_parent" android:layout_height="wrap_content"/>
会出现如下的错误：
Missing Constraints in ConstraintLayout
解决方法如下：
将代码改为<EditText android:id="@+id/edit_text" android:layout_width="match_parent" android:layout_height="wrap_content" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.0" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.112" />
根据 https://blog.csdn.net/fabbychips/article/details/91506715?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522161096002816780271589930%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request_id=161096002816780271589930&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2allfirst_rank_v2~rank_v29-1-91506715.pc_search_result_cache&utm_term=missing%20constraint%20in&spm=1018.2226.3001.4187
这篇博客修改的错误