Datepicker and TimePicker

public class MainActivity extends Activity {

	private DatePicker date_picker;
	private TimePicker time_picker;
	private TextView tv_date;
	private TextView tv_time;

	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        // initialization 
        date_picker=(DatePicker) findViewById(R.id.date);
        time_picker=(TimePicker) findViewById(R.id.time);
        tv_date=(TextView) findViewById(R.id.tv_date);
        tv_time=(TextView) findViewById(R.id.tv_time);
        // Obtain the time information of the current system 
        Calendar c=Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month=c.get(Calendar.MONTH);
        int day=c.get(Calendar.DAY_OF_MONTH);
        int hour=c.get(Calendar.HOUR_OF_DAY);
        int minute=c.get(Calendar.MINUTE);
        tv_date.setText(" Current date ："+year+"-"+(month+1)+"-"+day);
        tv_time.setText(" present time ："+hour+":"+minute);
        // Initialization date 
        date_picker.init(year, month, day, new OnDateChangedListener() {
			
			// Change of monitoring date 
        	@Override
			public void onDateChanged(DatePicker view, int year, int monthOfYear,
					int dayOfMonth) {
				// TODO Auto-generated method stub
				//Toast.makeText(MainActivity.this, " present time ："+year+"-"+(monthOfYear+1)+"-"+dayOfMonth, 0).show();
			    tv_date.setText(" Current date ："+year+"-"+(monthOfYear+1)+"-"+dayOfMonth);   
			}
		});
        
        // Set the time to 24 hourly 
        time_picker.setIs24HourView(true);
        time_picker.setOnTimeChangedListener(new OnTimeChangedListener() {	
			@Override
			public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
				// TODO Auto-generated method stub
				tv_time.setText(" present time ："+hourOfDay+":"+minute);
			}
		});
       
        
        
   
        
        
    }

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

Time selector and date selector in the form of dialog box

public class MainActivity extends Activity implements android.view.View.OnClickListener{

	private Button date_button;
	private Button time_button;
	private Calendar calendar;
	private TextView tv_date;
	private TextView tv_time;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
        date_button=(Button) findViewById(R.id.date_button);
        time_button=(Button) findViewById(R.id.time_button);
        tv_date=(TextView) findViewById(R.id.tv_date);
        tv_time=(TextView) findViewById(R.id.tv_time);
        date_button.setOnClickListener(this);
        time_button.setOnClickListener(this);
        // Get the current information of month, day, and time 
        calendar=Calendar.getInstance();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	
	private void showDateDialog()
	{
		DatePickerDialog date_dialog=new DatePickerDialog(MainActivity.this, new OnDateSetListener() {
			
			@Override
			public void onDateSet(DatePicker view, int year, int monthOfYear,
					int dayOfMonth) {
				// TODO Auto-generated method stub
				tv_date.setText(" Current date ："+year+"-"+(monthOfYear+1)+"-"+dayOfMonth);
			}
		}, calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));
		
		date_dialog.show();
	}
	
	private void showTimeDialog()
	{
		TimePickerDialog time_dialog=new TimePickerDialog(MainActivity.this, new OnTimeSetListener() {
			
			@Override
			public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
				// TODO Auto-generated method stub
				tv_time.setText(" present time ："+hourOfDay+":"+minute);
			}
		}, calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE), true);
		time_dialog.show();
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		switch(v.getId())
		{
		  case R.id.date_button:
			  showDateDialog();
			  break;
		  case R.id.time_button:
			  showTimeDialog();
			  break;
		}
	}