Android开发之时间日期操作实例

package com.example.activity_time_date;import java.util.Calendar;import android.app.Activity;import android.app.Dialog;import android.app.TimePickerDialog;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.TimePicker;public class MainActivity extends Activity { private TextView mytext = null; private Button mybutton1 = null; private Button mybutton2 = null; private int mHour; private int mMinute; static final int TIME_DIALOG_ID = 0; private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() {  @Override  public void onTimeSet(TimePicker view, int hourOfDay, int minute) {   // TODO Auto-generated method stub   mHour = hourOfDay;   mMinute = minute;   updateDisplay();  } }; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  mytext = (TextView)findViewById(R.id.textview);  mybutton1 = (Button)findViewById(R.id.button1);  mybutton2 = (Button)findViewById(R.id.button2);   mybutton1.setOnClickListener(new OnClickListener() {   @Override   public void onClick(View v) {    // TODO Auto-generated method stub    showDialog(TIME_DIALOG_ID);   }  });  mybutton2.setOnClickListener(new OnClickListener() {   @Override   public void onClick(View v) {    // TODO Auto-generated method stub    MainActivity.this.startActivity(new Intent(MainActivity.this, dateActivity.class));   }  });  final Calendar cal = Calendar.getInstance();  mHour = cal.get(Calendar.HOUR_OF_DAY);  mMinute = cal.get(Calendar.MINUTE);  updateDisplay(); } private void updateDisplay(){  mytext.setText(new StringBuilder().append(pad(mHour)).append(":")    .append(pad(mMinute))); } private static String pad(int i){  if (i >= 10)   return String.valueOf(i);  else   return "0" + String.valueOf(i); } @Override protected Dialog onCreateDialog(int id) {  switch (id) {  case TIME_DIALOG_ID:   return new TimePickerDialog(this, mTimeSetListener, mHour, mMinute,     false);  }  return null; }}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="${relativePackage}.${activityClass}" ><LinearLayout   android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:orientation="vertical" > <TextView  android:id="@+id/textview"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  /> <Button   android:id="@+id/button1"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:text="设置时间"  /> <Button   android:id="@+id/button2"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:text="下一页"  /></LinearLayout></RelativeLayout>