Date and time picker in same dialogbox

How can I show Date picker and time picker in the same dialog box ? If I' using

<TimePicker
    android:id="@+id/timePicker1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<DatePicker
    android:id="@+id/datePicker1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

what should be done on MainAcitiviy.java I'm new to android. I searched but didnt get anything,,