Custom string attribute breaks Android Studio's ConstraintLayout preview

Custom string attribute breaks Android Studio's ConstraintLayout preview - java

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"

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<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
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android:layout_height="match_parent"
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android:layout_marginStart="8dp"
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app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<View
android:layout_width="0dp"
android:layout_height="2dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="2dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:background="#3F230D"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView4"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="#+id/textView5"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Phone num:"
android:textSize="16sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="#+id/textView4"
app:layout_constraintTop_toBottomOf="#+id/textView4"
app:layout_constraintVertical_bias="0.0" />
<View
android:layout_width="0dp"
android:layout_height="2dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="2dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:background="#3F230D"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView5"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="#+id/textView9"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Date:"
android:textSize="16sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="#+id/textView8"
app:layout_constraintTop_toBottomOf="#+id/textView8"
app:layout_constraintVertical_bias="0.0" />
<View
android:id="#+id/view"
android:layout_width="0dp"
android:layout_height="2dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="2dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:background="#3F230D"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView9"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="#+id/textView6"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Kind of order:"
android:textSize="16sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="#+id/textView5"
app:layout_constraintTop_toBottomOf="#+id/textView5"
app:layout_constraintVertical_bias="0.0" />
<View
android:layout_width="0dp"
android:layout_height="2dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="2dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:background="#3F230D"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView6"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="#+id/textView7"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Price:"
android:textSize="16sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="#+id/textView6"
app:layout_constraintTop_toBottomOf="#+id/textView6"
app:layout_constraintVertical_bias="0.065" />
<View
android:layout_width="0dp"
android:layout_height="2dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="2dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:background="#3F230D"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView7"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="#+id/textView8"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Deposit:"
android:textSize="16sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="#+id/textView7"
app:layout_constraintTop_toBottomOf="#+id/textView7"
app:layout_constraintVertical_bias="0.0" />
<View
android:layout_width="0dp"
android:layout_height="2dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="2dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:background="#3F230D"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView8"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="#+id/tv_name"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:text="Jett Kavinsky"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="#+id/textView4"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="#+id/textView4"
app:layout_constraintTop_toTopOf="#+id/textView4" />
<TextView
android:id="#+id/tv_number"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:text="077364063"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="#+id/textView5"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="#+id/textView5"
app:layout_constraintTop_toTopOf="#+id/textView5" />
<TextView
android:id="#+id/tv_kind"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="Some text here"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="#+id/textView6"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="#+id/textView6"
app:layout_constraintTop_toTopOf="#+id/textView6" />
<TextView
android:id="#+id/tv_price"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:text="150000"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="#+id/textView7"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="#+id/textView7"
app:layout_constraintTop_toTopOf="#+id/textView7" />
<TextView
android:id="#+id/tv_deposit"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:text="20000"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="#+id/textView8"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="#+id/textView8"
app:layout_constraintTop_toTopOf="#+id/textView8" />
<TextView
android:id="#+id/tv_date"
style="#style/TextAppearance.AppCompat.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:text="04․08․2021"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="#+id/textView9"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="#+id/textView9"
app:layout_constraintTop_toTopOf="#+id/textView9" />
</androidx.constraintlayout.widget.ConstraintLayout>
the 3rd parameter should be a two-lined text, but the second line should begin under the "kind of order" and not the "some text here" (as it drops under the "some text here" right now). How can I change this? Thank you from ahead.

You can use \n to new line like this:
android:text="text\nmore text"

Making layout works on all Android devices with fixed dimensions

I am facing trouble of getting my layouts works on all Android devices with the same dimensions. I noticed that every time a friend installs my app, the Buttons and TextViews are changing their initial positions, going up or down some times or making the text inside of it wrapping instead of display it all ( i will attach some code of one of the layouts as an example ). I need some good documentation and/or tutorials for the best layout designs.
Layout example:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/dashboardsec"
tools:context=".main.DashboardActivity">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#009B3232"
android:orientation="vertical"
android:paddingEnd="5dp"
android:textAlignment="textEnd">
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="66dp"
android:layout_gravity="center_horizontal"
android:layout_marginStart="33dp"
android:layout_marginTop="40dp"
android:layout_marginEnd="40dp"
android:background="#color/common_google_signin_btn_text_dark_disabled"
android:fontFamily="sans-serif-thin"
android:gravity="center"
android:text="مرحباً بك "
android:textAlignment="textStart"
android:textColor="#color/orange1"
android:textSize="24sp" />
<Button
android:id="#+id/newsBtn"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" الاخبار "
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textColorHint="#00AF2B2B"
android:textSize="22sp" />
<Button
android:id="#+id/formatsBtn"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" فورمات جاهزة و كتب رسمية"
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
<Button
android:id="#+id/storagebtN"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" فيديو و صور "
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
<Button
android:id="#+id/exchangeBtn"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" طلبات استبدال المراكز "
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
<Button
android:id="#+id/askBtn"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" الخرائط و الصرافات الالية "
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
<Button
android:id="#+id/phonesBtn"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" فهرست الهواتف"
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
<Button
android:id="#+id/websitsbtn"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" صفحات تابعة لللجنة"
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
<Button
android:id="#+id/profilebtn"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:shadowColor="#color/common_google_signin_btn_text_dark_focused"
android:text=" أدوات مفيدة coming soon"
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
<Button
android:id="#+id/button1"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" السوق coming soon"
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
<Button
android:id="#+id/usersaccount"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" التحكم بالاعضاء"
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
<Button
android:id="#+id/sendimalsBtn"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" ارسال بريد للادارة"
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
<Button
android:id="#+id/button"
android:layout_width="385dp"
android:layout_height="wrap_content"
android:background="#009B3232"
android:fontFamily="sans-serif-thin"
android:text=" تسجيل خروج "
android:textAlignment="textStart"
android:textColor="#DCDFE9"
android:textSize="22sp" />
</LinearLayout>
</ScrollView>

This is happening because you are using fixed size dimensions on your views, and because different phones got different screen sizes you will see this difference.
As mentioned in the comment section- you can use ConstraintLayout to create one layout to support all different screen sizes.
Here is an example of your wanted layout (similar in the look of it any way):
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layoutDirection="ltr"
android:orientation="vertical">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/button6"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button5"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button5"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button7"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button6" />
<Button
android:id="#+id/button7"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button8"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button5" />
<Button
android:id="#+id/button8"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button9"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button7" />
<Button
android:id="#+id/button9"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button10"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button8" />
<Button
android:id="#+id/button10"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button11"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button9" />
<Button
android:id="#+id/button11"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button12"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button10" />
<Button
android:id="#+id/button12"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button13"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button11" />
<Button
android:id="#+id/button13"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button14"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button12" />
<Button
android:id="#+id/button14"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button15"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button13" />
<Button
android:id="#+id/button15"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button16"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button14" />
<Button
android:id="#+id/button16"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button17"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button15" />
<Button
android:id="#+id/button17"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="#+id/button18"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button16" />
<Button
android:id="#+id/button18"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHeight_percent=".2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/button17" />
</android.support.constraint.ConstraintLayout>
</ScrollView>

Is it possible to put an image over all other layout elements (Buttons...)

I have a login screen with a Login button... I also have a ViewPager with some images. When I slide the ViewPager the image covers some login elements, but not all.
Right now I use the android:background = "myImage"
I also tried to use android:foreground = "myImage", but somehow it does not cover two of my buttons.
Here is some code from my main Activity:
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:fitsSystemWindows="true"
android:orientation="vertical">
<FrameLayout
android:id="#+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/imageView2"
android:layout_width="415dp"
android:layout_height="277dp"
android:layout_marginBottom="540dp"
android:src="#drawable/jus_login_two"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.558" />
<EditText
android:id="#+id/mainActivity_username"
android:layout_width="300sp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:backgroundTint="#32756e"
android:ems="10"
android:hint="E-Mail-Adresse"
android:inputType="textPersonName"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.364" />
<EditText
android:id="#+id/mainActivity_password"
android:layout_width="300sp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:backgroundTint="#32756e"
android:ems="10"
android:hint="Passwort"
android:inputType="textPassword"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#+id/mainActivity_username"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="#+id/tvText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="OR"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/mainActivity_errorMessage"
app:layout_constraintVertical_bias="0.32"/>
<TextView
android:id="#+id/mainActivity_errorMessage"
android:layout_width="wrap_content"
android:layout_height="24dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:text=""
android:textColor="#FF0000"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.658" />
<Button
android:id="#+id/mainActivity_login"
android:layout_width="270dp"
android:layout_height="45dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:background="#32756e"
android:text="Anmelden"
android:textAllCaps="false"
android:textColor="#ffff"
android:textSize="20sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.496"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.532" />
<Button
android:id="#+id/mainActivity_continueWithout"
style="?android:attr/borderlessButtonStyle"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="ohne anmelden fortfahren"
android:textAllCaps="false"
android:textColor="#32756e"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/mainActivity_createNewAccount"
app:layout_constraintVertical_bias="0.075" />
<Button
android:id="#+id/mainActivity_createNewAccount"
android:layout_width="200dp"
android:layout_height="30dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:background="#3b5998"
android:text="Neues Konto erstellen"
android:textAllCaps="false"
android:textColor="#ffff"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.504"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.859"/>
<Button
android:id="#+id/mainActivity_forgotPassword"
style="?android:attr/borderlessButtonStyle"
android:layout_width="wrap_content"
android:layout_height="20sp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:background="#android:color/white"
android:text="Passwort vergessen?"
android:textAllCaps="false"
android:textColor="#32756e"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.71" />
<View
android:layout_width="150sp"
android:layout_height="1dp"
android:layout_centerVertical="true"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_toLeftOf="#id/tvText"
android:background="#A9A9A9"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/tvText"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.756" />
<View
android:layout_width="150sp"
android:layout_height="1dp"
android:layout_centerVertical="true"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_toRightOf="#id/tvText"
android:background="#A9A9A9"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/tvText"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.757" />
<CheckBox
android:id="#+id/checkBox_rememberPwdUsr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="E-Mail-Adresse und Passwort speichern?"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.434"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.597" />
<androidx.viewpager.widget.ViewPager
android:id="#+id/therealPager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</FrameLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ProgressBar
android:id="#+id/progress_bar"
style="#style/Widget.AppCompat.ProgressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:elevation="20dp"
android:visibility="gone" />
</RelativeLayout>
</androidx.drawerlayout.widget.DrawerLayout>
Here is the code where I set the image:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:background="#drawable/jus_slide_one"
android:layout_height="match_parent">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

How to always show Toolbar in Android even when there is scrolling?

After looking up various answers and suggestions on the site, I implemented a custom toolbar in my app instead of using the default ActionBar. For the most part, it works fine, however, one thing that is different from the standard action bar is that it auto-hides whenever I scroll. In the default ActionBar, it was always visible on the activity regardless of whether I was scrolling or not. Can anyone please explain how to implement this behavior in the custom toolbar as well? I have attached my xml below:
EDIT: I have tried moving the toolbar out of the scrollview which fixes the toolbar but then when I scroll, then other views in my activity also overlap on the toolbar because the top-most view is bound to the scrollview and other views are bound to it. So, the current implementation is better than the overlapping problem, but it is still not the solution I desire.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ScrollView
android:id="#+id/sc1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="8dp"
android:layout_marginEnd="0dp"
android:layout_marginLeft="0dp"
android:layout_marginRight="0dp"
android:layout_marginStart="0dp"
android:layout_marginTop="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="#+id/searchBar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:ems="10"
android:hint="Search..."
android:textColorHint="#color/myWhite"
android:inputType="textPersonName"
android:textColor="#color/myWhite"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.503"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/subtitleBtn" />
<android.support.v7.widget.Toolbar
android:id="#+id/myToolbar"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/colorPrimary"
app:titleTextColor="#color/myWhite"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:contentInsetLeft="48dp"
android:contentInsetStart="48dp"
app:titleMarginStart="24dp"
app:contentInsetLeft="12dp"
app:contentInsetStart="12dp"
android:contentInsetRight="0dp"
android:contentInsetEnd="0dp"
app:contentInsetRight="0dp"
app:contentInsetEnd="0dp"/>
<Button
android:id="#+id/splitDrawableBackgroundBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Set Split Drawable Background"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.517"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/stackedDrawableBackgroundBtn" />
<Button
android:id="#+id/subtitleBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Show Subtitle"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/iconBtn" />
<Button
android:id="#+id/iconBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Set Icon"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/alternateBackBtn" />
<Button
android:id="#+id/alternateBackBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Set Alternate Back Button"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/hideBarBtn" />
<Button
android:id="#+id/hideBarBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Hide Action Bar"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/elevationBtn" />
<Button
android:id="#+id/elevationBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Set Elevation"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/logoBtn" />
<Button
android:id="#+id/logoBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Set Logo"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/hideAllBtn" />
<Button
android:id="#+id/hideAllBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Hide Everything"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/hideBackBtn" />
<Button
android:id="#+id/hideBackBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Hide Back Button"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.502"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/splitDrawableBackgroundBtn" />
<Button
android:id="#+id/stackedDrawableBackgroundBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Set Stacked Drawable Background"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/drawableBackgroundBtn" />
<Button
android:id="#+id/drawableBackgroundBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Set Drawable Background"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/customViewBtn" />
<Button
android:id="#+id/customViewBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Show Custom View"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/hideOffsetBtn" />
<Button
android:id="#+id/hideOffsetBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Hide Offset"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/backBtn" />
<Button
android:id="#+id/backBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="24dp"
android:text="Show back button"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/titleBtn" />
<Button
android:id="#+id/titleBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="88dp"
android:text="Set Title"
android:fontFamily="#font/roboto_black"
android:textAllCaps="false"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
</ScrollView>
</android.support.constraint.ConstraintLayout>

Since the toolbar is inside the scrollview it will scroll.
Take it out and constraint it to the top of the Constraint Layout.

Please place the toolbar before scrollview. Then it becomes not scrollable and the rest of the area is scrollable

move your toolbar to our side of the scroll view
your view hierarchy should be something like this :
<LinearLayout>
<Toolbar/>
<FrameLayout>
<ScrollView/>
</FrameLayoyt>
</LinearLayout>

Your Toolbar is in the Scrollview, you can place on top of the CoordinatorLayout to solve the issue. so your code will look like this,
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/root"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<ScrollView
android:id="#+id/sc1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText />
<!-- other controls -->
</android.support.constraint.ConstraintLayout>
</ScrollView>
</android.support.design.widget.CoordinatorLayout>

My application keeps on crashing saying "Has Stopped" Caused by: java.lang.NullPointerException [duplicate]

This question already has answers here:
NullPointerException on findViewById() in android
(3 answers)
Closed 5 years ago.
I run the application on debugging mode then It keeps on crashing. On the logicat monitor it says :
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageButton.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at nws.iceapp.MainActivity.imgButtonLoadPage(MainActivity.java:174)
at nws.iceapp.MainActivity.onCreate(MainActivity.java:160)
Here is what popped up when I clicked on (MainActivity.java:174)
protected void imgButtonLoadPage (int buttonID, final int activity) {
ImageButton imgBtn = (ImageButton) findViewById(buttonID);
imgBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
setContentView(activity);
}
});
Specifically starting on the imgButtonLoadpage, And when I clicked on (MainActivity.java:160) this popped up:
imgButtonLoadPage(R.id.asthma, R.layout.act_ast);
imgButtonLoadPage(R.id.vomiting, R.layout.act_vom);
imgButtonLoadPage(R.id.unconscious, R.layout.act_unc);
imgButtonLoadPage(R.id.fracture2, R.layout.act_fra);
imgButtonLoadPage(R.id.dislocate2, R.layout.act_dis);
imgButtonLoadPage(R.id.heart_attack2, R.layout.act_hea);
}
Here is the layout xml codes:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="nws.iceapp.MainActivity">
<ScrollView
android:id="#+id/scrollView2"
android:layout_width="368dp"
android:layout_height="518dp"
android:layout_marginBottom="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.506"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:weightSum="1">
<ImageButton
android:id="#+id/asthma"
android:layout_width="match_parent"
android:layout_height="115dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_weight="1.16"
android:scaleType="centerCrop"
android:src="#drawable/asthma_icon"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.189"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.11" />
<TextView
android:id="#+id/ast"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Asthma"
android:background="#333"
android:textColor="#fff"
android:textSize="21sp" />
<ImageButton
android:id="#+id/vomiting"
android:layout_width="match_parent"
android:layout_height="115dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_weight="0.47"
android:scaleType="centerCrop"
android:src="#drawable/vomit_icon"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.189"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.452" />
<TextView
android:id="#+id/vom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Vomiting"
android:background="#333"
android:textColor="#fff"
android:textSize="21sp" />
<ImageButton
android:id="#+id/unconscious"
android:layout_width="match_parent"
android:layout_height="115dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:scaleType="centerCrop"
android:src="#drawable/lost_conscious_icon"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.774"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.11" />
<TextView
android:id="#+id/unc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Unconscious"
android:background="#333"
android:textColor="#fff"
android:textSize="21sp" />
<ImageButton
android:id="#+id/fracture2"
android:layout_width="match_parent"
android:layout_height="115dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:scaleType="centerCrop"
android:src="#drawable/fracture_icon"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.189"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.794" />
<TextView
android:id="#+id/fra"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Fracture"
android:gravity="center"
android:background="#333"
android:textColor="#fff"
android:textSize="21sp" />
<ImageButton
android:id="#+id/dislocate2"
android:layout_width="match_parent"
android:layout_height="115dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:scaleType="centerCrop"
android:src="#drawable/dislocate_icon"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.774"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.452" />
<TextView
android:id="#+id/dis"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Dislocate"
android:gravity="center"
android:background="#333"
android:textColor="#fff"
android:textSize="21sp" />
<ImageButton
android:id="#+id/heart_attack2"
android:layout_width="match_parent"
android:layout_height="115dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:scaleType="centerCrop"
android:src="#drawable/heart_attack_icon"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.774"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.794" />
<TextView
android:id="#+id/hea"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Heart Attack"
android:background="#333"
android:textColor="#fff"
android:gravity="center"
android:textSize="21sp" />
</LinearLayout>
</ScrollView>
</android.support.constraint.ConstraintLayout>

This question is probably the most asked question by the new comers and Android Studio tag is irrelevant. If you get a NullPointerException in Java or Android you probably not instantiated a view or object using new keyword or findViewById() or relevant methods. In short, your view is not inflated from xml file and has a null pointer in memory.You should search before opening threads, especially NullPointerException threads.

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