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

    <DatePicker
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

public class TestDatePicker extends ListActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_date_picker);

        DatePickerAdapter myAdapter = new DatePickerAdapter();
        setListAdapter(myAdapter);
    }
}

class DatePickerAdapter extends BaseAdapter {
    @Override
    public int getCount() { return 0; }

    @Override
    public Object getItem(int i) { return null; }

    @Override
    public long getItemId(int i) { return 0; }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) { return null;}
}