本实例通过TimePickerDialog时间选择对话框让用户设置闹钟。并通过AlarmManager全局定时器在指定的时间启动闹钟Activity
。

程序执行效果图：

实例代码：

package com.jph.alarm.test;

import java.util.Calendar;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TimePicker;
import android.widget.Toast;
/**
 * Describe:</br>
 * </br>简单闹钟提醒
 * </br>本实例通过TimePickerDialog时间选择对话框
 * </br>让用户设置闹钟并通过AlarmManager全局定时器
 * </br>在指定的时间启动闹钟Activity 
 * </br>@author jph
 * </br>Date:2014.07.29
 * */
public class AlarmTest extends Activity
{
	Button setTime;
	AlarmManager aManager;
	Calendar currentTime = Calendar.getInstance();

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		// 获取程序界面的button
		setTime = (Button) findViewById(R.id.setTime);
		// 获取AlarmManager对象
		aManager = (AlarmManager) getSystemService(
			Service.ALARM_SERVICE);
		// 为“设置闹铃”button绑定监听器。

		setTime.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View source)
			{
				Calendar currentTime = Calendar.getInstance();
				// 创建一个TimePickerDialog实例，并把它显示出来。
				new TimePickerDialog(AlarmTest.this, 0, // 绑定监听器
					new TimePickerDialog.OnTimeSetListener()
					{
						@Override
						public void onTimeSet(TimePicker tp,
							int hourOfDay, int minute)
						{
							// 指定启动AlarmActivity组件
							Intent intent = new Intent();
							intent.setAction("com.jph.alarm.test.ACTION");
							// 创建PendingIntent对象
							PendingIntent pi = PendingIntent.getActivity(
								AlarmTest.this, 0, intent, 0);
							Calendar c = Calendar.getInstance();
							// 依据用户选择时间来设置Calendar对象
							c.set(Calendar.HOUR_OF_DAY, hourOfDay);
							c.set(Calendar.MINUTE, minute);
							// 设置AlarmManager将在Calendar相应的时间启动指定组件
							aManager.set(AlarmManager.RTC_WAKEUP,
								c.getTimeInMillis(), pi);							
							// 显示闹铃设置成功的提示信息
							Toast.makeText(AlarmTest.this, "闹铃设置成功啦"
								, Toast.LENGTH_SHORT).show();
						}
					}, currentTime.get(Calendar.HOUR_OF_DAY), currentTime
						.get(Calendar.MINUTE), false).show();
			}
		});
	}	
}

package com.jph.alarm.test;

import java.util.Calendar;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TimePicker;
import android.widget.Toast;
/**
 * Describe:</br>
 * </br>简单闹钟提醒
 * </br>本实例通过TimePickerDialog时间选择对话框
 * </br>让用户设置闹钟并通过AlarmManager全局定时器
 * </br>在指定的时间启动闹钟Activity 
 * </br>@author jph
 * </br>Date:2014.07.29
 * */
public class AlarmTest extends Activity
{
	Button setTime;
	AlarmManager aManager;
	Calendar currentTime = Calendar.getInstance();

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		// 获取程序界面的button
		setTime = (Button) findViewById(R.id.setTime);
		// 获取AlarmManager对象
		aManager = (AlarmManager) getSystemService(
			Service.ALARM_SERVICE);
		// 为“设置闹铃”button绑定监听器。
		setTime.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View source)
			{
				Calendar currentTime = Calendar.getInstance();
				// 创建一个TimePickerDialog实例，并把它显示出来。

				new TimePickerDialog(AlarmTest.this, 0, // 绑定监听器
					new TimePickerDialog.OnTimeSetListener()
					{
						@Override
						public void onTimeSet(TimePicker tp,
							int hourOfDay, int minute)
						{
							// 指定启动AlarmActivity组件
							Intent intent = new Intent();
							intent.setAction("com.jph.alarm.test.ACTION");
							// 创建PendingIntent对象
							PendingIntent pi = PendingIntent.getActivity(
								AlarmTest.this, 0, intent, 0);
							Calendar c = Calendar.getInstance();
							// 依据用户选择时间来设置Calendar对象
							c.set(Calendar.HOUR_OF_DAY, hourOfDay);
							c.set(Calendar.MINUTE, minute);
							// 设置AlarmManager将在Calendar相应的时间启动指定组件
							aManager.set(AlarmManager.RTC_WAKEUP,
								c.getTimeInMillis(), pi);							
							// 显示闹铃设置成功的提示信息
							Toast.makeText(AlarmTest.this, "闹铃设置成功啦"
								, Toast.LENGTH_SHORT).show();
						}
					}, currentTime.get(Calendar.HOUR_OF_DAY), currentTime
						.get(Calendar.MINUTE), false).show();
			}
		});
	}	
}

AndroidManifest.xml

<?
xml version="1.0" encoding="utf-8"?
>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
	package="com.jph.alarm.test"
	android:versionCode="1"
	android:versionName="1.0">
	<uses-sdk
		android:minSdkVersion="7"
		android:targetSdkVersion="18" />
	<application android:icon="@drawable/ic_launcher" android:label="@string/app_name">
		<activity android:name=".AlarmTest"		  
				android:label="@string/app_name">
			<intent-filter>
				<action android:name="android.intent.action.MAIN" />
				<category android:name="android.intent.category.LAUNCHER" />
			</intent-filter>
		</activity>
		<activity android:name=".AlarmActivity">
		    <intent-filter>
			    <action android:name="com.jph.alarm.test.ACTION"/>
			    <category android:name="android.intent.category.DEFAULT"></category>
			</intent-filter>
		</activity>
	</application>

</manifest>