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activity_service.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.instantappsample.service.foreground.com.instantappsample.service.ServiceManagementActivity">

<TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/hint"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/btn_service_start"
        app:layout_constraintStart_toStartOf="parent"
        android:layout_marginStart="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        android:layout_marginEnd="8dp" />
    <Button android:id="@+id/btn_service_start"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/btn_service_start"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    <Button
            android:id="@+id/btn_service_bind"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="@string/btn_service_bind"
            android:layout_marginTop="8dp"
            app:layout_constraintTop_toBottomOf="@+id/btn_service_start"
            android:layout_marginRight="8dp" app:layout_constraintRight_toRightOf="parent"
            android:layout_marginLeft="8dp" app:layout_constraintLeft_toLeftOf="parent" />

<TextView
            android:id="@+id/infoView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintBottom_toBottomOf="parent" android:layout_marginBottom="8dp"
            android:layout_marginTop="8dp"
            app:layout_constraintTop_toBottomOf="@+id/btn_service_bind" />

</android.support.constraint.ConstraintLayout>