how to make android analog clock and digital clock

activity_main.xml:

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

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Analog Clock"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <AnalogClock
        android:id="@+id/analogClock1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Digital Clock"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <DigitalClock
        android:id="@+id/digitalClock1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="DigitalClock" />

</LinearLayout>

MainActivity:

import android.app.Activity;
import android.os.Bundle;
import android.widget.AnalogClock;
import android.widget.DigitalClock;

public class MyAndroidAppActivity extends Activity {

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  AnalogClock ac = (AnalogClock) findViewById(R.id.analogClock1);
  //what can i do with AnalogClock?

  DigitalClock dc = (DigitalClock) findViewById(R.id.digitalClock1);
  //what can i do with DigitalClock also? for display only

 }

}

output: