news-sarcher-android/app/src/main/res/layout/activity_main.xml

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

    <EditText
        android:id="@+id/editText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:ems="10"
        android:hint="@string/query"
        android:imeOptions="actionSearch"
        android:inputType="text"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.4"
        app:layout_constraintBottom_toTopOf="@+id/horizontalScrollView"
        app:layout_constraintRight_toLeftOf="@+id/imageButton"
        android:layout_marginRight="8dp" />

    <CheckBox
        android:id="@+id/stopwordsCheck"
        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:layout_marginTop="8dp"
        android:text="@string/remove_stopwords"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/stemmingCheck" />

    <CheckBox
        android:id="@+id/stemmingCheck"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:text="@string/stemming"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintHorizontal_bias="0.0"
        android:layout_marginTop="8dp"
        app:layout_constraintTop_toBottomOf="@+id/horizontalScrollView" />

    <HorizontalScrollView
        android:id="@+id/horizontalScrollView"
        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"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginTop="8dp"
        app:layout_constraintTop_toBottomOf="@+id/imageButton">

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            style="?android:buttonBarStyle"
            android:orientation="horizontal">

            <Button
                android:id="@+id/button"
                style="?android:attr/buttonBarButtonStyle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:layout_weight="1"
                android:onClick="onSymbolClick"
                android:text="@string/asterisk"
                app:layout_constraintLeft_toRightOf="@+id/button2"
                app:layout_constraintTop_toBottomOf="@+id/editText" />

            <Button
                android:id="@+id/button2"
                style="?android:attr/buttonBarButtonStyle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:layout_weight="1"
                android:onClick="onSymbolClick"
                android:text="@string/question_mark"
                app:layout_constraintLeft_toRightOf="@+id/button2"
                app:layout_constraintTop_toBottomOf="@+id/editText" />

            <Button
                android:id="@+id/button3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:onClick="onBoolClick"
                android:text="@string/and_search"
                style="?android:attr/buttonBarButtonStyle"
                app:layout_constraintLeft_toRightOf="@+id/button2"
                app:layout_constraintTop_toBottomOf="@+id/editText" />

            <Button
                android:id="@+id/button4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:onClick="onBoolClick"
                android:text="@string/or_search"
                style="?android:attr/buttonBarButtonStyle"
                app:layout_constraintLeft_toRightOf="@+id/button3"
                app:layout_constraintTop_toBottomOf="@+id/editText" />

            <Button
                android:id="@+id/button8"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:layout_weight="1"
                android:onClick="onBoolClick"
                android:text="@string/not_search"
                style="?android:attr/buttonBarButtonStyle"
                app:layout_constraintLeft_toRightOf="@+id/button3"
                app:layout_constraintTop_toBottomOf="@+id/editText" />

            <Button
                android:id="@+id/button7"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:layout_weight="1"
                android:onClick="onFieldClick"
                android:text="@string/category_search"
                style="?android:attr/buttonBarButtonStyle"
                app:layout_constraintLeft_toRightOf="@+id/button3"
                app:layout_constraintTop_toBottomOf="@+id/editText"
                android:layout_marginBottom="0dp" />

            <Button
                android:id="@+id/button6"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:layout_weight="1"
                android:onClick="onFieldClick"
                android:text="@string/headline_search"
                style="?android:attr/buttonBarButtonStyle"
                app:layout_constraintLeft_toRightOf="@+id/button3"
                app:layout_constraintTop_toBottomOf="@+id/editText" />

            <Button
                android:id="@+id/button5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:layout_weight="1"
                android:onClick="onFieldClick"
                android:text="@string/date_search"
                style="?android:attr/buttonBarButtonStyle"
                app:layout_constraintLeft_toRightOf="@+id/button3"
                app:layout_constraintTop_toBottomOf="@+id/editText" />

        </LinearLayout>
    </HorizontalScrollView>

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        android:text="@string/click_to_see_the_result_long_click_to_copy"
        app:layout_constraintLeft_toLeftOf="parent"
        android:layout_marginTop="8dp"
        app:layout_constraintTop_toBottomOf="@+id/stopwordsCheck" />

    <ListView
        android:id="@+id/listView"
        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"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginTop="8dp"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <ImageButton
        android:id="@+id/imageButton"
        style="@style/Widget.AppCompat.ImageButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:contentDescription="@string/search"
        android:onClick="onButtonClick"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_search_black_24dp"
        android:layout_marginLeft="8dp" />

</android.support.constraint.ConstraintLayout>