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

<LinearLayout android:id="@+id/MyLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <TextView android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Countdown starts here"
        android:gravity="center"
        android:textSize="20dp">
    </TextView>

    <Button android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Start Countdown"
        android:onClick="start_click">
    </Button>

    <Button android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Reset Countdown"
        android:onClick="reset_click">
    </Button>

</LinearLayout>