activity_time_picker.xml

<?xml version="1.0" encoding="utf-8"?>

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.example.abcd.alarmclock.TimePickerActivity">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <DatePicker
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/dpDate"/>

    <TimePicker
        android:id="@+id/tpTime"

        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/ok"
        android:textColor="#1d0036"
        android:layout_marginTop="20dp"
        android:layout_gravity="center"
        android:elevation="0dp"
        android:onClick="backToMain"
        android:id="@+id/btnOk"/>

</LinearLayout>

</ScrollView>