Use TimePickerDialog

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
  <TextView android:id="@+id/dateAndTime"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    />
  <Button android:id="@+id/dateBtn"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Set the Date"
    />
  <Button android:id="@+id/timeBtn"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Set the Time"
    />
</LinearLayout>

/***//  w ww . jav  a  2s.  c o m
  Copyright (c) 2008-2009 CommonsWare, LLC
  
  Licensed under the Apache License, Version 2.0 (the "License"); you may
  not use this file except in compliance with the License. You may obtain
  a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/


package com.java2s.myapplication3.app;

import android.app.Activity;
import android.os.Bundle;
import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TimePicker;
import android.widget.TextView;
import java.text.DateFormat;
import java.util.Calendar;

public class MainActivity extends Activity {
    DateFormat fmtDateAndTime=DateFormat.getDateTimeInstance();
    TextView dateAndTimeLabel;
    Calendar dateAndTime=Calendar.getInstance();
    DatePickerDialog.OnDateSetListener d=new DatePickerDialog.OnDateSetListener() {
        public void onDateSet(DatePicker view, int year, int monthOfYear,
                              int dayOfMonth) {
            dateAndTime.set(Calendar.YEAR, year);
            dateAndTime.set(Calendar.MONTH, monthOfYear);
            dateAndTime.set(Calendar.DAY_OF_MONTH, dayOfMonth);
            updateLabel();
        }
    };
    TimePickerDialog.OnTimeSetListener t=new TimePickerDialog.OnTimeSetListener() {
        public void onTimeSet(TimePicker view, int hourOfDay,
                              int minute) {
            dateAndTime.set(Calendar.HOUR_OF_DAY, hourOfDay);
            dateAndTime.set(Calendar.MINUTE, minute);
            updateLabel();
        }
    };

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.activity_main);

        Button btn=(Button)findViewById(R.id.dateBtn);

        btn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                new DatePickerDialog(MainActivity.this,
                        d,
                        dateAndTime.get(Calendar.YEAR),
                        dateAndTime.get(Calendar.MONTH),
                        dateAndTime.get(Calendar.DAY_OF_MONTH)).show();
            }
        });

        btn=(Button)findViewById(R.id.timeBtn);

        btn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                new TimePickerDialog(MainActivity.this,
                        t,
                        dateAndTime.get(Calendar.HOUR_OF_DAY),
                        dateAndTime.get(Calendar.MINUTE),
                        true).show();
            }
        });

        dateAndTimeLabel=(TextView)findViewById(R.id.dateAndTime);

        updateLabel();
    }

    private void updateLabel() {
        dateAndTimeLabel.setText(fmtDateAndTime.format(dateAndTime.getTime()));
    }
}