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I created a custom view extending the AutoCompleteTextView. Also I have custom attributes related to that. When I set the custom string attribute value in the layout, the constraint layout design screen preview stops properly working. When I remove the custom string attribute, the constraint layout works properly. This only takes place at design time, there is no problem at run time. I reinstalled and updated Android Studio but it didn't help me. My codes and screenshots are below:

broken view when setting custom attribute named model_field

attrs.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <declare-styleable name="DATV">
 <attr name="model_field" format="string"/>
 <attr name="search_type" format="enum">
 <enum name="never" value="0"/>
 <enum name="always" value="1"/>
 <enum name="depended" value="2"/>
 </attr>
 </declare-styleable>
</resources>

Layout.xml:

<?xml version="1.0" encoding="utf-8"?>
 <ScrollView
 android:layout_width="match_parent"
 android:layout_height="match_parent" xmlns:tools="http://schemas.android.com/tools"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:android="http://schemas.android.com/apk/res/android">
 <android.support.constraint.ConstraintLayout android:layout_width="match_parent"
 android:layout_height="wrap_content">

 <!-- TODO: Update blank fragment layout -->


 <AutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/multiAutoCompleteTextView2"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView13"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/e_mail_adresi"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView16" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView4"/>
 <AutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView7"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView12"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/telefon"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView17" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView3"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"/>
 <AutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView8" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" app:layout_constraintTop_toBottomOf="@+id/textView11"
 android:layout_marginTop="8dp" app:layout_constraintEnd_toEndOf="parent"
 android:layout_marginEnd="8dp" android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/tc_kimlik_no"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView18" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView2"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"/>
 <TextView
 android:text="@string/arac_bilgileri"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" android:id="@+id/textView2"
 app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" android:layout_marginTop="16dp" android:textStyle="bold"/>
 <TextView
 android:text="@string/marka"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView3" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/textView2" android:labelFor="@+id/carBrandDATV"/>
 <tr.com.universe.raportiz.lib.views.CarBrandDATV
 app:model_field="@string/CarBrand_name"
 app:search_type="always"
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/carBrandDATV"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView3"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"
 />
 <TextView
 android:text="@string/model"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView4" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/carBrandDATV"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 />
 <tr.com.universe.raportiz.lib.views.CarModelDATV
 app:model_field="@string/CarModel_name"
 app:search_type="depended"
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/carModelDATV"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView4"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/plaka"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView6" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/carModelDATV" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp"/>
 <tr.com.universe.raportiz.lib.views.CarDATV
 app:model_field="@string/Car_plate_no"
 app:search_type="always"
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/plateNoDATV"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView6"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/sasi_numaras"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView7" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/plateNoDATV" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp"/>
 <tr.com.universe.raportiz.lib.views.CarDATV
 app:model_field="@string/Car_chassis_no"
 app:search_type="always"
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView5"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView7"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/motor_numarasi"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView8" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView5"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"/>
 <tr.com.universe.raportiz.lib.views.CarDATV
 app:model_field="@string/Car_engine_no"
 app:search_type="always"
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView8"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/arac_sahibi"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView9"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 android:layout_marginTop="8dp" android:textStyle="bold"/>
 <TextView
 android:text="@string/ad_soyad"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView10" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/textView9" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp"/>
 <AutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView2"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView10"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/tc_kimlik_no"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView11" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView2"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"/>
 <AutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView3" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" app:layout_constraintTop_toBottomOf="@+id/textView11"
 android:layout_marginTop="8dp" app:layout_constraintEnd_toEndOf="parent"
 android:layout_marginEnd="8dp" android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/telefon"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView12" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView3"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"/>
 <AutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView4"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView12"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/e_mail_adresi"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView13" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView4"/>
 <MultiAutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/multiAutoCompleteTextView"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView13"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/alici_bilgileri"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView14" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/multiAutoCompleteTextView"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 android:textStyle="bold"/>
 <TextView
 android:text="@string/ad_soyad"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView15" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/textView14"/>
 <AutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView6" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/textView15" app:layout_constraintEnd_toEndOf="parent"
 android:layout_marginEnd="8dp" android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/tc_kimlik_no"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView19" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView6"/>
 <AutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView9" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/textView19" app:layout_constraintEnd_toEndOf="parent"
 android:layout_marginEnd="8dp" android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/telefon"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView20" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView9"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"/>
 <AutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView10"
 android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/textView20"
 app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
 app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
 android:background="@drawable/edittext_selector"/>
 <TextView
 android:text="@string/e_mail_adresi"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView21" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/autoCompleteTextView10"/>
 <AutoCompleteTextView
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:id="@+id/autoCompleteTextView11" app:layout_constraintStart_toStartOf="parent"
 android:layout_marginStart="8dp" android:layout_marginTop="8dp"
 app:layout_constraintTop_toBottomOf="@+id/textView21" app:layout_constraintEnd_toEndOf="parent"
 android:layout_marginEnd="8dp" android:background="@drawable/edittext_selector"/>
 </android.support.constraint.ConstraintLayout>
</ScrollView>

When I remove the model_field attributes, the preview works properly like below

the view when I remove the custom attributes named "model_field"