DatePicker TimePicker 与TextView同步显示日期和时间

package com.luohaibo.testdemo06;

import java.text.SimpleDateFormat;
import java.util.Calendar;

import com.luohaibo.testdemo06.R.id;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TimePicker.OnTimeChangedListener;

public class MainActivity extends Activity implements OnDateChangedListener, OnTimeChangedListener {
    private TextView textView;
    private DatePicker datePicker;
    private TimePicker timePicker;
    
    @Override
    public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
        // TODO Auto-generated method stub
        onDateChanged(null, 0 ,0 ,0);
        
    }
    @Override
    public void onDateChanged(DatePicker view, int year, int monthOfYear,
            int dayOfMonth) {
        // TODO Auto-generated method stub
        Calendar calendar = Calendar.getInstance();
        calendar.set(datePicker.getYear(), datePicker.getMonth(), datePicker.getDayOfMonth(), timePicker.getCurrentHour(), timePicker.getCurrentMinute());
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月  HH:MM");
        textView.setText(sdf.format(calendar.getTime()));
        
    }
    
    
    
    
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        datePicker = (DatePicker)findViewById(R.id.datepicker);
        timePicker = (TimePicker)findViewById(R.id.timepicker);
        datePicker.init(2014, 4, 1,this);
        timePicker.setIs24HourView(true);
        timePicker.setOnTimeChangedListener(this);
        textView = (TextView) findViewById(R.id.textview);
        onDateChanged(null, 0, 0, 0);
    }

    @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;
    }

}