activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="16dp"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView12"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Contoh DigitalClock "
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textSize="30sp" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="30dp"
        android:layout_marginTop="70dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView13"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Digital Clock: "
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textColor="#666"
            android:textSize="26sp" />

        <DigitalClock
            android:id="@+id/digitalClock"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="6dp"
            android:textColor="#3498db"
            android:textSize="24sp" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="30dp"
        android:layout_marginTop="20dp"
        android:gravity="center_horizontal"
        android:orientation="vertical">

        <Button
            android:id="@+id/showDigitalClock"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="showDigitalClock"
            android:text="Tampilkan DigitalClock"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textColor="#666"
            android:textSize="20sp" />

        <DigitalClock
            android:id="@+id/digitalClock1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:textColor="#3498db"
            android:textSize="40sp" />

    </LinearLayout>

    <TextView
        android:id="@+id/textView14"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="bottom|center"
        android:text="okedroid.com"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textSize="24sp" />
</LinearLayout>